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E.g. I've avoided adding filesystems used in variable names because it's supposed to be two words in text. Signed-off-by: Cyril Hrubis --- doc_new/spelling_wordlist | 40 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) diff --git a/doc_new/spelling_wordlist b/doc_new/spelling_wordlist index 0c016e615..de1e3721e 100644 --- a/doc_new/spelling_wordlist +++ b/doc_new/spelling_wordlist @@ -118,3 +118,43 @@ vCPUs vendoring vger wallclock +pid +TBROK +mkfs +hugepages +hugetlbfs +printf +scanf +argv +argc +pthread +futex +hdr +brk +iovec +iov +strdup +aprintf +alloc +hexd +tcases +strsig +strstatus +strerrno +libcap +capset +capget +musl +setrlimit +rlim +optstr +tmpfs +nodev +sys +proc +arg +ver +bitwise +dereferenced +allocator +ptr From patchwork Tue Apr 2 16:41:31 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cyril Hrubis X-Patchwork-Id: 1918928 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; 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DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:email]; NEURAL_HAM_LONG(-1.00)[-0.998]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(2.20)[]; MIME_TRACE(0.00)[0:+]; RCVD_IN_DNSWL_HI(-0.50)[2a07:de40:b281:106:10:150:64:167:received]; RCVD_TLS_ALL(0.00)[]; BAYES_HAM(-3.00)[100.00%] X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Rspamd-Queue-Id: 82363348BD X-Spam-Status: No, score=0.1 required=7.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,DKIM_VALID_EF,DMARC_MISSING,SPF_HELO_NONE,SPF_PASS shortcircuit=no autolearn=disabled version=4.0.0 X-Spam-Checker-Version: SpamAssassin 4.0.0 (2022-12-13) on in-2.smtp.seeweb.it X-Virus-Scanned: clamav-milter 1.0.3 at in-2.smtp.seeweb.it X-Virus-Status: Clean Subject: [LTP] [PATCH v2 2/2] include: doc: Convert comments into linuxdoc X-BeenThere: ltp@lists.linux.it X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux Test Project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Cyril Hrubis Errors-To: ltp-bounces+incoming=patchwork.ozlabs.org@lists.linux.it Sender: "ltp" From: Cyril Hrubis Signed-off-by: Cyril Hrubis --- doc_new/developers/api_c_tests.rst | 26 ++ include/tst_buffers.h | 86 +++-- include/tst_capability.h | 80 ++++- include/tst_checkpoint.h | 64 +++- include/tst_compiler.h | 20 ++ include/tst_hugepage.h | 2 + include/tst_parse.h | 65 ++++ include/tst_res_flags.h | 72 +++- include/tst_test.h | 509 +++++++++++++++++++++-------- 9 files changed, 722 insertions(+), 202 deletions(-) create mode 100644 include/tst_compiler.h create mode 100644 include/tst_parse.h diff --git a/doc_new/developers/api_c_tests.rst b/doc_new/developers/api_c_tests.rst index adee17f16..2c0c8419d 100644 --- a/doc_new/developers/api_c_tests.rst +++ b/doc_new/developers/api_c_tests.rst @@ -5,3 +5,29 @@ Developing using C API ====================== + +Core LTP API +------------ + +.. kernel-doc:: ../../include/tst_res_flags.h +.. kernel-doc:: ../../include/tst_test.h + +Option parsing +-------------- + +.. kernel-doc:: ../../include/tst_parse.h + +Guarded buffers +--------------- + +.. kernel-doc:: ../../include/tst_buffers.h + +Checkpoints +----------- + +.. kernel-doc:: ../../include/tst_checkpoint.h + +Capabilities +------------ + +.. kernel-doc:: ../../include/tst_capability.h diff --git a/include/tst_buffers.h b/include/tst_buffers.h index b5f355f0f..149b28427 100644 --- a/include/tst_buffers.h +++ b/include/tst_buffers.h @@ -3,69 +3,95 @@ * Copyright (c) 2019 Cyril Hrubis */ +/** + * DOC: Guarded buffers introduction + * + * Guarded buffer has a page with PROT_NONE allocated right before the start of + * the buffer and canary after the end of the buffer. That means that any + * memory access before the buffer ends with EFAULT or SEGFAULT and any write + * after the end of the buffer will be detected because it would overwrite the + * canaries. + * + * It should be used for all buffers passed to syscalls to make sure off-by-one + * buffer accesses does not happen. + */ + #ifndef TST_BUFFERS_H__ #define TST_BUFFERS_H__ -/* +/** + * struct tst_buffers - A guarded buffer description for allocator. + * * Buffer description consist of a pointer to a pointer and buffer type/size * encoded as a different structure members. * - * Only one of the size and iov_sizes can be set at a time. + * @ptr: A pointer to the pointer to buffer. This is dereferenced and set by the + * allocator. + * @size: A buffer size in bytes. Only one of size and iov_sizes can be set. + * @iov_sizes: An -1 terminated array of sizes used to construct a + * struct iovec buffers. + * @str: If size is zero and iov_sizes is NULL this string is going to be + * copied into the buffer. */ struct tst_buffers { - /* - * This pointer points to a buffer pointer. - */ void *ptr; - /* - * Buffer size. - */ size_t size; - /* - * Array of iov buffer sizes terminated by -1. - */ int *iov_sizes; - /* - * If size and iov_sizes is NULL this is the string we want to strdup() - * into the buffer. - */ char *str; }; -/* - * Allocates buffers based on the tst_buffers structure. +/** + * tst_buffers_alloc() - Allocates buffers based on the tst_buffers structure. * - * @bufs NULL terminated array of test buffer descriptions. + * @bufs: A NULL terminated array of test buffer descriptions. * - * This is called from the test library if the tst_test->bufs pointer is set. + * This is called from the test library if the tst_test.bufs pointer is set. */ void tst_buffers_alloc(struct tst_buffers bufs[]); -/* - * strdup() that callls tst_alloc(). +/** + * tst_strdup() - Copies a string into a newly allocated guarded buffer. + * + * @str: A string to be duplicated. + * return: A pointer to the string duplicated in a guarded buffer. + * + * Allocates a buffer with tst_alloc() and copies the string into it. */ char *tst_strdup(const char *str); -/* - * Allocates size bytes, returns pointer to the allocated buffer. +/** + * tst_alloc() - Allocates a guarded buffer. + * + * @size: A size of the buffer. + * return: A newly allocated guarded buffer. */ void *tst_alloc(size_t size); -/* - * Printf into a guarded buffer. +/** + * tst_aprintf() - Printf into a newly allocated guarded buffer. + * + * @fmt: A printf-like format. + * @...: A printf-like parameters. + * return: A newly allocated buffer. + * + * Allocates a buffer with tst_alloc() then prints the data into it. */ char *tst_aprintf(const char *fmt, ...) __attribute__((format (printf, 1, 2))); -/* - * Allocates iovec structure including the buffers. +/** + * tst_iovec_alloc() - Allocates a complete iovec structure. * - * @sizes -1 terminated array of buffer sizes. + * @sizes: A -1 terminated array of buffer sizes. + * return: Newly allocated iovec structure. */ struct iovec *tst_iovec_alloc(int sizes[]); -/* - * Frees all allocated buffers. +/** + * tst_free_all() - Frees all allocated buffers. + * + * It's important to free all guarded buffers because the canaries after the + * buffer are checked only when the buffer is being freed. * * This is called at the end of the test automatically. */ diff --git a/include/tst_capability.h b/include/tst_capability.h index 6067804a3..ccf4bd77b 100644 --- a/include/tst_capability.h +++ b/include/tst_capability.h @@ -2,8 +2,9 @@ /* * Copyright (c) 2019 Richard Palethorpe */ + /** - * @file tst_capability.h + * DOC: Capabilities introduction * * Limited capability operations without libcap. */ @@ -15,22 +16,51 @@ #include "lapi/capability.h" -#define TST_CAP_DROP 1 -#define TST_CAP_REQ (1 << 1) - -#define TST_CAP(action, capability) {action, capability, #capability} +/** + * enum tst_cap_act - A capability action masks. + * + * @TST_CAP_DROP: Drop capabilities. + * @TST_CAP_REQ: Add capabilities. + */ +enum tst_cap_act { + TST_CAP_DROP = 1, + TST_CAP_REQ = (1 << 1) +}; +/** + * struct tst_cap_user_header - Kernel capget(), capset() syscall header. + * + * @version: A capability API version. + * @pid: A process to operate on. + */ struct tst_cap_user_header { uint32_t version; int pid; }; +/** + * struct tst_cap_user_data - Kernel capset(), capget() syscall payload. + * + * @effective: A capability effective set. + * @permitted: A capability permitted set. + * @inheritable: A capability inheritable set. + */ struct tst_cap_user_data { uint32_t effective; uint32_t permitted; uint32_t inheritable; }; +/** + * struct tst_cap - A capability to alter. + * + * @action: What should we do, i.e. drop or add a capability. + * @id: A capability id. + * @name: A capability name. + * + * This structure is usually constructed with the TST_CAP() macro so that the + * name is created automatically. + */ struct tst_cap { uint32_t action; uint32_t id; @@ -38,25 +68,43 @@ struct tst_cap { }; /** - * Get the capabilities as decided by hdr. + * TST_CAP() - Create a struct tst_cap entry. * - * Note that the memory pointed to by data should be large enough to store two - * structs. + * @action: What should we do, i.e. drop or add capability. + * @capability: A capability id, e.g. CAP_BPF. + */ +#define TST_CAP(action, capability) {action, capability, #capability} + +/** + * tst_capget() - Get the capabilities as decided by hdr. + * + * @hdr: A capability user header stores a pid to operate on and which + * capability API version is used. + * @data: A memory to store the capabilities to. The memory pointed to by data + * should be large enough to store two structs. + * + * return: Returns 0 on success, -1 on a failure and sets errno. */ int tst_capget(struct tst_cap_user_header *hdr, struct tst_cap_user_data *data); /** - * Set the capabilities as decided by hdr and data + * tst_capset() - Set the capabilities as decided by hdr and data * - * Note that the memory pointed to by data should be large enough to store two - * structs. + * @hdr: A capability user header stores a pid to operate on and which + * capability API version is used. + * @data: A memory to store the capabilities to. The memory pointed to by data + * should be large enough to store two structs. + * + * return: Returns 0 on success, -1 on a failure and sets errno. */ int tst_capset(struct tst_cap_user_header *hdr, const struct tst_cap_user_data *data); /** - * Add, check or remove a capability + * tst_cap_action() - Add, check or remove a capability. + * + * @cap: An {} terminated array of capabilities to alter. * * It will attempt to drop or add capability to the effective set. It will * try to detect if this is needed and whether it can or can't be done. If it @@ -71,13 +119,17 @@ void tst_cap_action(struct tst_cap *cap); /** - * Add, check or remove a capabilities + * tst_cap_setup() - Add, check or remove a capabilities. + * + * @cap: An {} terminated array of capabilities to alter. + * @action_mask: Decides which actions are done, i.e. only drop caps, add them + * or both. * * Takes a NULL terminated array of structs which describe whether some * capabilities are needed or not and mask that determines subset of the * actions to be performed. Loops over the array and if mask matches the * element action it's passed to tst_cap_action(). */ -void tst_cap_setup(struct tst_cap *cap, unsigned int action_mask); +void tst_cap_setup(struct tst_cap *cap, enum tst_cap_act action_mask); #endif /* TST_CAPABILITY_H */ diff --git a/include/tst_checkpoint.h b/include/tst_checkpoint.h index 1b6911d73..a8d66a333 100644 --- a/include/tst_checkpoint.h +++ b/include/tst_checkpoint.h @@ -1,24 +1,86 @@ -/* SPDX-License-Identifier: GPL-2.0-or-later +// SPDX-License-Identifier: GPL-2.0-or-later +/* * Copyright (c) 2016 Cyril Hrubis */ +/** + * DOC: Checkpoints introduction + * + * Checkpoints implements a futex based synchronization primitive for threads + * and processes. When a process calls wait function its execution is suspended + * until wake is called for a corresponding checkpoint. Checkpoints are + * numbered from 0 and process can use at least hundred of them. + * + * In order to use checkpoints the test must set the tst_test.needs_checkpoints + * flag. + */ + #ifndef TST_CHECKPOINT__ #define TST_CHECKPOINT__ #include "tst_checkpoint_fn.h" +/** + * TST_CHECKPOINT_WAIT() - Waits for a checkpoint. + * + * @id: A checkpoint id a positive integer. + * + * Suspends thread/process execution until it's woken up with a wake. The call + * does not wait indefinitely it gives up after 10 seconds. If an error + * happened or timeout was reached the function calls tst_brk(TBROK, ...) which + * exits the test. + */ #define TST_CHECKPOINT_WAIT(id) \ tst_safe_checkpoint_wait(__FILE__, __LINE__, NULL, id, 0) +/** + * TST_CHECKPOINT_WAIT2() - Waits for a checkpoint. + * + * @id: A checkpoint id a positive integer. + * @msec_timeout: A timeout. + * + * Suspends thread/process execution until it's woken up with a wake. If an + * error happened or timeout was reached the function calls tst_brk(TBROK, ...) + * which exits the test. + */ #define TST_CHECKPOINT_WAIT2(id, msec_timeout) \ tst_safe_checkpoint_wait(__FILE__, __LINE__, NULL, id, msec_timeout) +/** + * TST_CHECKPOINT_WAKE() - Wakes up a checkpoint. + * + * @id: A checkpoint id a positive integer. + * + * Wakes up a process suspended on a checkpoint and retries if there is no + * process suspended on the checkpoint yet. The call does not retry + * indefinitely but gives up after 10 seconds. If an error happened or timeout + * was reached the function calls tst_brk(TBROK, ...) which exits the test. + */ #define TST_CHECKPOINT_WAKE(id) \ tst_safe_checkpoint_wake(__FILE__, __LINE__, NULL, id, 1) +/** + * TST_CHECKPOINT_WAKE2() - Wakes up several checkpoints. + * + * @id: A checkpoint id a positive integer. + * @nr_wake: A number of processes to wake. + * + * Wakes up nr_wake processes suspended on a checkpoint and retries if there + * wasn't enough process suspended on the checkpoint yet. The call does not + * retry indefinitely but gives up if it does not wake nr_wake processes after + * 10 seconds. If an error happened or timeout was reached the function calls + * tst_brk(TBROK, ...) which exits the test. + */ #define TST_CHECKPOINT_WAKE2(id, nr_wake) \ tst_safe_checkpoint_wake(__FILE__, __LINE__, NULL, id, nr_wake) +/** + * TST_CHECKPOINT_WAKE_AND_WAIT() - Wakes up a checkpoint and immediately waits on it. + * + * @id: A checkpoint id a positive integer. + * + * This is a combination of TST_CHECKPOINT_WAKE() and TST_CHECKPOINT_WAIT(). + */ #define TST_CHECKPOINT_WAKE_AND_WAIT(id) do { \ tst_safe_checkpoint_wake(__FILE__, __LINE__, NULL, id, 1); \ tst_safe_checkpoint_wait(__FILE__, __LINE__, NULL, id, 0); \ diff --git a/include/tst_compiler.h b/include/tst_compiler.h new file mode 100644 index 000000000..ec88213df --- /dev/null +++ b/include/tst_compiler.h @@ -0,0 +1,20 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ + +/** + * @file tst_compiler.h + * @brief Macros to support dumb compilers. + * + * The doxygen parser (and possibly other C tooling) does not understand + * __attributes__ so we have to hide them with macros. + */ + +#ifndef TST_COMPILER_H__ +#define TST_COMPILER_H__ + +#ifdef __GNUC__ +# define TST_ATTRIBUTE(...) __attribute__((__VA_ARGS__)) +#else +# define TST_ATTRIBUTE(...) +#endif + +#endif /* TST_COMPILER_H__ */ diff --git a/include/tst_hugepage.h b/include/tst_hugepage.h index 46327c79a..6b865b2f2 100644 --- a/include/tst_hugepage.h +++ b/include/tst_hugepage.h @@ -24,6 +24,8 @@ enum tst_hp_policy { TST_NEEDS, }; +#define TST_NO_HUGEPAGES ((unsigned long)-1) + struct tst_hugepage { const unsigned long number; enum tst_hp_policy policy; diff --git a/include/tst_parse.h b/include/tst_parse.h new file mode 100644 index 000000000..11c36e812 --- /dev/null +++ b/include/tst_parse.h @@ -0,0 +1,65 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (c) 2015-2024 Cyril Hrubis + */ + +/** + * DOC: Option parsing functions + * + * Implements simple helpers on the top of the strtol() and strtod() for + * command line option parsing. + */ + +#ifndef TST_PARSE_H__ +#define TST_PARSE_H__ + +/** + * tst_parse_int() - Parse an integer from a string. + * + * @str: A string with an integer number. + * @val: A pointer to integer to store the result to. + * @min: A lower bound, pass INT_MIN for full range. + * @max: An upper bound, pass INT_MAX for full range. + * return: A zero if whole string was consumed and the value was within bounds, + * an errno otherwise. + */ +int tst_parse_int(const char *str, int *val, int min, int max); + +/** + * tst_parse_long() - Parse a long integer from a string. + * + * @str: A string with an integer number. + * @val: A pointer to long integer to store the result to. + * @min: A lower bound, pass LONG_MIN for full range. + * @max: An upper bound, pass LONG_MAX for full range. + * return: A zero if whole string was consumed and the value was within bounds, + * an errno otherwise. + */ +int tst_parse_long(const char *str, long *val, long min, long max); + +/** + * tst_parse_float() - Parse a floating point number from a string. + * + * @str: A string with a floating point number. + * @val: A pointer to float to store the result to. + * @min: A lower bound. + * @max: An upper bound. + * return: A zero if whole string was consumed and the value was within bounds, + * an errno otherwise. + */ +int tst_parse_float(const char *str, float *val, float min, float max); + +/** + * tst_parse_filesize() - Parse a file size from a string. + * + * @str: A string a positive number optionally followed by an unit, i.e. K, M, + * or G for kilobytes, megabytes and gigabytes. + * @val: A pointer to long long integer to store the size in bytes to. + * @min: A lower bound. + * @max: An upper bound. + * return: A zero if whole string was consumed and the value was within bounds, + * an errno otherwise. + */ +int tst_parse_filesize(const char *str, long long *val, long long min, long long max); + +#endif /* TST_PARSE_H__ */ diff --git a/include/tst_res_flags.h b/include/tst_res_flags.h index 872352144..806940e0d 100644 --- a/include/tst_res_flags.h +++ b/include/tst_res_flags.h @@ -1,24 +1,66 @@ -/* SPDX-License-Identifier: GPL-2.0-or-later +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* * Copyright (c) Linux Test Project, 2014 */ #ifndef TST_RES_FLAGS_H #define TST_RES_FLAGS_H -/* Use low 6 bits to encode test type */ -#define TTYPE_MASK 0x3f -#define TPASS 0 /* Test passed flag */ -#define TFAIL 1 /* Test failed flag */ -#define TBROK 2 /* Test broken flag */ -#define TWARN 4 /* Test warning flag */ -#define TDEBUG 8 /* Test debug information flag */ -#define TINFO 16 /* Test information flag */ -#define TCONF 32 /* Test not appropriate for configuration flag */ -#define TTYPE_RESULT(ttype) ((ttype) & TTYPE_MASK) +/** + * enum tst_res_flags - Test result reporting flags. + * + * @TPASS: Reports a single success. + * @TFAIL: Reports a single failure. + * @TBROK: Reports a single breakage. + * @TWARN: Reports a single warning. Warnings increment a warning counter and + * show up in test results. + * + * @TDEBUG: Prints additional debugging messages, it does not change the test result counters and + * the message is not displayed unless debugging is enabled with -D + * test command line parameter. + * + * @TINFO: Prints an additional information, it does not change the test result + * counters but unlike TDEBUG the message is always displayed. + * + * @TCONF: Reports unsupported configuration. When tests produce this result at + * least a subset of test was skipped, because it couldn't run. The + * usual reasons are, missing kernel modules or CONFIG options. + * Unsuitable CPU architecture, not enough memory, etc. + * + * @TERRNO: Combine bitwise with result flags to append errno to the output message. + * + * @TTERRNO: Combine bitwise with result flags to append error from TST_ERR to + * the message. The TST_TEST() macros store the errno into the + * TST_ERR global variable in order to make sure it's not change + * between the test is done and results are printed. + * + * @TRERRNO: Combine bitwise with result flags to errno from TST_RET variable + * to the message. The TST_TEST() macros store return value into the + * TST_RET global variable and quite a few, e.g. pthread functions, + * return the error value directly instead of storing it to the errno. + * + * A result flag with optional bitwise combination of errno flag are passed to + * the tst_res() and tst_brk() functions. Each message counts as a single test + * result and tests can produce arbitrary number of results, i.e. TPASS, TFAIL, + * TBROK, TWARN and TCONF messages. Each such message increases a result + * counter in a piece of shared memory, which means that reported results are + * accounted immediately even from child processes and there is no need for + * result propagation. + */ +enum tst_res_flags { + TPASS = 0, + TFAIL = 1, + TBROK = 2, + TWARN = 4, + TDEBUG = 8, + TINFO = 16, + TCONF = 32, + TERRNO = 0x100, + TTERRNO = 0x200, + TRERRNO = 0x400, +}; -#define TERRNO 0x100 /* Append errno information to output */ -#define TTERRNO 0x200 /* Append TEST_ERRNO information to output */ -#define TRERRNO 0x400 /* Capture errno information from TEST_RETURN to - output; useful for pthread-like APIs :). */ +#define TTYPE_RESULT(ttype) ((ttype) & TTYPE_MASK) +#define TTYPE_MASK 0x3f #endif /* TST_RES_FLAGS_H */ diff --git a/include/tst_test.h b/include/tst_test.h index 47b5902f9..b5f6ba8ea 100644 --- a/include/tst_test.h +++ b/include/tst_test.h @@ -1,4 +1,4 @@ -// SPDX-License-Identifier: GPL-2.0-or-later +/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Copyright (c) 2015-2016 Cyril Hrubis * Copyright (c) Linux Test Project, 2016-2019 @@ -19,6 +19,7 @@ #include "tst_common.h" #include "tst_res_flags.h" +#include "tst_parse.h" #include "tst_test_macros.h" #include "tst_checkpoint.h" #include "tst_device.h" @@ -47,50 +48,102 @@ #include "tst_arch.h" #include "tst_fd.h" -/* - * Reports testcase result. - */ void tst_res_(const char *file, const int lineno, int ttype, const char *fmt, ...) __attribute__ ((format (printf, 4, 5))); +/** + * tst_res() - Reports a test result. + * + * @ttype: An enum tst_res_type. + * @arg_fmt: A printf-like format. + * @...: A printf-like parameters. + * + * This is the main test reporting function. Each time this function is called + * with one of TPASS, TFAIL, TCONF, TBROK or TWARN a counter in page of shared + * memory is incremented. This means that there is no need to propagate test + * results from children and that results are accounted for once this function + * returns. The counters are incremented atomically which makes this function + * thread-safe. + */ #define tst_res(ttype, arg_fmt, ...) \ ({ \ TST_RES_SUPPORTS_TCONF_TDEBUG_TFAIL_TINFO_TPASS_TWARN(\ !((TTYPE_RESULT(ttype) ?: TCONF) & \ - (TCONF | TDEBUG | TFAIL | TINFO | TPASS | TWARN))); \ + (TCONF | TDEBUG | TFAIL | TINFO | TPASS | TWARN))); \ tst_res_(__FILE__, __LINE__, (ttype), (arg_fmt), ##__VA_ARGS__);\ }) void tst_resm_hexd_(const char *file, const int lineno, int ttype, const void *buf, size_t size, const char *arg_fmt, ...) __attribute__ ((format (printf, 6, 7))); - +/** + * tst_res_hexd() - Reports a test result along with hex dump of a buffer. + * + * This call is the same as tst_res() but includes a pointer and size of the + * buffer that is going to be printed in the output in a hexadecimal format. + * + * @ttype: An enum tst_res_type. + * @buf: A pointer to a buffer to print in hexadecimal format. + * @size: A size of the buffer. + * @arg_fmt: A printf-like format. + * @...: A printf-like parameters. + */ #define tst_res_hexd(ttype, buf, size, arg_fmt, ...) \ tst_resm_hexd_(__FILE__, __LINE__, (ttype), (buf), (size), \ (arg_fmt), ##__VA_ARGS__) -/* - * Reports result and exits a test. - */ void tst_brk_(const char *file, const int lineno, int ttype, const char *fmt, ...) __attribute__ ((format (printf, 4, 5))); +/** + * tst_brk() - Reports a breakage and exits the test. + * + * @ttype: An enum tst_res_type. + * @arg_fmt: A printf-like format. + * @...: A printf-like parameters. + * + * Reports either TBROK or TCONF and exits the test immediately. When called + * all children in the same process group as the main test library process are + * killed. This function, unless in a test cleanup, calls _exit() and does not + * return. + * + * When test is in cleanup() function TBROK is converted into TWARN by the test + * library and we attempt to carry on with a cleanup even when tst_brk() was + * called. This makes it possible to use SAFE_FOO() macros in the test cleanup + * without interrupting the cleanup process on a failure. + */ #define tst_brk(ttype, arg_fmt, ...) \ ({ \ TST_BRK_SUPPORTS_ONLY_TCONF_TBROK(!((ttype) & \ - (TBROK | TCONF | TFAIL))); \ + (TBROK | TCONF | TFAIL))); \ tst_brk_(__FILE__, __LINE__, (ttype), (arg_fmt), ##__VA_ARGS__);\ }) void tst_printf(const char *const fmt, ...) __attribute__((nonnull(1), format (printf, 1, 2))); -/* flush stderr and stdout */ +/** + * tst_flush() - Flushes the output file streams. + * + * There are rare cases when we want to flush the output file streams + * explicitly, e.g. before we do an action that may crash the test to ensure + * that the messages have been written out. + * + * This is also called by the SAFE_FORK() because otherwise each child would + * end up with the same copy of the file in it's memory and any messages in + * buffers would be multiplied. + */ void tst_flush(void); pid_t safe_fork(const char *filename, unsigned int lineno); +/** + * SAFE_FORK() - Forks a test child. + * + * This call makes sure that output file streams are flushed and also handles + * errors from fork(). Use this instead of fork() whenever possible! + */ #define SAFE_FORK() \ safe_fork(__FILE__, __LINE__) @@ -98,15 +151,30 @@ pid_t safe_fork(const char *filename, unsigned int lineno); ({int ret = expr; \ ret != 0 ? tst_res(TINFO, #expr " failed"), ret : ret; }) \ -/* - * Functions to convert ERRNO to its name and SIGNAL to its name. +/** + * tst_strerrno() - Converts an errno number into a name. + * + * @err: An errno number. + * return: An errno name e.g. "EINVAL". */ const char *tst_strerrno(int err); + +/** + * tst_strsig() - Converts a signal number into a name. + * + * @sig: A signal number. + * return: A signal name e.g. "SIGINT". + */ const char *tst_strsig(int sig); -/* - * Returns string describing status as returned by wait(). + + +/** + * tst_strstatus() - Returns string describing status as returned by wait(). + * + * WARNING: Not thread safe. * - * BEWARE: Not thread safe. + * @status: A status as returned by wait() + * return: A string description for the status e.g. "killed by SIGKILL". */ const char *tst_strstatus(int status); @@ -116,30 +184,49 @@ const char *tst_strstatus(int status); #include "tst_clone.h" #include "tst_cgroup.h" -/* - * Wait for all children and exit with TBROK if - * any of them returned a non-zero exit status. +/** + * tst_reap_children() - Waits for all child processes to exit. + * + * Wait for all children and exit with TBROK if any of them returned a non-zero + * exit status. */ void tst_reap_children(void); +/** + * struct tst_option - Test command line option. + * + * @optstr: A short command line option, e.g. "a" or "a:". + * @arg: A pointer to store the option value to. + * @help: A help string for the option displayed when test is passed '-h' on + * the command-line. + */ struct tst_option { char *optstr; char **arg; char *help; }; -/* - * Options parsing helpers. +/** + * struct tst_tag - A test tag. * - * If str is NULL these are No-op. + * @name: A tag name. + * @value: A tag value. * - * On failure non-zero (errno) is returned. + * This structure is used to encode pointers to upstream commits in regression + * tests as well as CVE numbers or any additional useful hints. + * + * The content of these tags is printed by the test on a failure to help the + * testers with debugging. + * + * The supported tags are: + * + * - "linux-git" with first 12 numbers from an upstream kernel git hash. + * - "CVE" with a CVE number e.g. "2000-1234". + * - "glibc-git" with first 12 numbers from an upstream glibc git hash. + * - "musl-git" with first 12 numbers from an upstream musl git hash. + * - "known-fail" a message describing something that is supposed to work but + * rather than that produces a longstanding failures. */ -int tst_parse_int(const char *str, int *val, int min, int max); -int tst_parse_long(const char *str, long *val, long min, long max); -int tst_parse_float(const char *str, float *val, float min, float max); -int tst_parse_filesize(const char *str, long long *val, long long min, long long max); - struct tst_tag { const char *name; const char *value; @@ -147,30 +234,246 @@ struct tst_tag { extern unsigned int tst_variant; -#define TST_NO_HUGEPAGES ((unsigned long)-1) - #define TST_UNLIMITED_RUNTIME (-1) +/** + * struct tst_ulimit_val - An ulimit resource and value. + * + * @resource: Which resource limits should be adjusted. See setrlimit(2) for + * the list of the RLIMIT_* constants. + * @rlim_cur: A limit value. + */ struct tst_ulimit_val { int resource; rlim_t rlim_cur; }; -struct tst_test { - /* number of tests available in test() function */ +/** + * struct tst_test - A test description. + * + * @tcnt: A number of tests. If set the test() callback is called tcnt times + * and each time passed an increasing counter value. + * @options: An NULL optstr terminated array of struct tst_option. + * + * @min_kver: A minimal kernel version the test can run on. e.g. "3.10". + * + * @supported_archs: A NULL terminated array of architectures the test runs on + * e.g. {"x86_64, "x86", NULL}. Calls tst_is_on_arch() to + * check if current CPU architecture is supported and exits + * the test with TCONF if it's not. + * + * @tconf_msg: If set the test exits with TCONF right after entering the test + * library. This is used by the TST_TEST_TCONF() macro to disable + * tests at compile time. + * + * @needs_tmpdir: If set a temporary directory is prepared for the test inside + * $TMPDIR and the test $CWD is set to point to it. The content + * of the temporary directory is removed automatically after + * the test is finished. + * + * @needs_root: If set the test exit with TCONF unless it's executed under root + * user. + * + * @forks_child: Has to be set if the test intends to fork children. + * + * @needs_device: If set a block device is prepared for the test, the device + * path and size are set in the struct tst_device variable + * called tst_device. If $LTP_DEV variable exists in the test + * environment the test attempts to use that device first and + * only if that fails the test falls back to use loop devices. + * This flag implies needs_tmpdir flag because loop device + * backing files are created in the test temporary directory. + * + * @needs_checkpoints: Has to be set if the test wants to use checkpoint + * synchronization primitives. + * + * @needs_overlay: If set overlay file system is mounted on the top of the + * file system at tst_test.mntpoint. + * + * @format_device: Does all tst_test.needs_device would do and also formats + * the device with tst_test.dev_fs_type file system as well. + * + * @mount_device: Does all tst_test.format_device would do and also mounts the + * device at tst_test.mntpoint. + * + * @needs_rofs: If set a read-only file system is mounted at tst_test.mntpoint. + * + * @child_needs_reinit: Has to be set if the test needs to call tst_reinit() + * from a process started by exec(). + * + * @needs_devfs: If set the devfs is mounted at tst_test.mntpoint. This is + * needed for tests that need to create device files since tmpfs + * at /tmp is usually mounted with 'nodev' option. + * + * @restore_wallclock: Saves wall clock at the start of the test and restores + * it at the end with the help of monotonic timers. + * Testcases that modify system wallclock use this to + * restore the system to the previous state. + * + * @all_filesystems: If set the test is executed for all supported filesytems, + * i.e. file system that is supported by the kernel and has + * mkfs installed on the system.The file system is mounted at + * tst_test.mntpoint and file system details, e.g. type are set + * in the struct tst_device. Each execution is independent, + * that means that for each iteration tst_test.setup() is + * called at the test start and tst_test.cleanup() is called + * at the end and tst_brk() only exits test for a single + * file system. That especially means that calling + * tst_brk(TCONF, ...) in the test setup will skip the + * current file system. + * + * @skip_in_lockdown: Skip the test if kernel lockdown is enabled. + * + * @skip_in_secureboot: Skip the test if secureboot is enabled. + * + * @skip_in_compat: Skip the test if we are executing 32bit binary on a 64bit + * kernel, i.e. we are testing the kernel compat layer. + * + * @needs_hugetlbfs: If set hugetlbfs is mounted at tst_test.mntpoint. + * + * @skip_filesystems: A NULL terminated array of unsupported file systems. The + * test reports TCONF if the file system to be tested is + * present in the array. This is especially useful to filter + * out unsupported file system when tst_test.all_filesystems + * is enabled. + * + * @min_cpus: Minimal number of online CPUs the test needs to run. + * + * @min_mem_avail: Minimal amount of available RAM memory in megabytes required + * for the test to run. + * + * @min_swap_avail: Minimal amount of available swap memory in megabytes + * required for the test to run. + * + * @hugepages: An interface to reserve hugepages prior running the test. + * Request how many hugepages should be reserved in the global + * pool and also if having hugepages is required for the test run + * or not, i.e. if test should exit with TCONF if the requested + * amount of hugepages cannot be reserved. If TST_REQUEST is set + * the library will try it's best to reserve the hugepages and + * return the number of available hugepages in tst_hugepages, which + * may be 0 if there is no free memory or hugepages are not + * supported at all. If TST_NEEDS the requested hugepages are + * required for the test and the test exits if it couldn't be + * required. It can also be used to disable hugepages by setting + * .hugepages = {TST_NO_HUGEPAGES}. The test library restores the + * original poll allocations after the test has finished. + * + * @taint_check: If set the test fails if kernel is tainted during the test run. + * That means tst_taint_init() is called during the test setup + * and tst_taint_check() at the end of the test. If all_filesystems + * is set taint check will be performed after each iteration and + * testing will be terminated by TBROK if taint is detected. + * + * @test_variants: If set denotes number of test variant, the test is executed + * variants times each time with tst_variant set to different + * number. This allows us to run the same test for different + * settings. The intended use is to test different syscall + * wrappers/variants but the API is generic and does not limit + * usage in any way. + * + * @dev_min_size: A minimal device size in megabytes. + * + * @dev_fs_type: If set overrides the default file system type for the device and + * sets the tst_device.fs_type. + * + * @dev_fs_opts: A NULL terminated array of options passed to mkfs in the case + * of 'tst_test.format_device'. These options are passed to mkfs + * before the device path. + * + * @dev_extra_opts: A NULL terminated array of extra options passed to mkfs in + * the case of 'tst_test.format_device'. Extra options are + * passed to mkfs after the device path. Commonly the option + * after mkfs is the number of blocks and can be used to limit + * the file system not to use the whole block device. + * + * @mntpoint: A mount point where the test library mounts requested file system. + * The directory is created by the library, the test must not create + * it itself. + * + * @mnt_flags: MS_* flags passed to mount(2) when the test library mounts a + * device in the case of 'tst_test.mount_device'. + * + * @mnt_data: The data passed to mount(2) when the test library mounts a device + * in the case of 'tst_test.mount_device'. + * + * @max_runtime: Maximal test runtime in seconds. Any test that runs for more + * than a second or two should set this and also use + * tst_remaining_runtime() to exit when runtime was used up. + * Tests may finish sooner, for example if requested number of + * iterations was reached before the runtime runs out. If test + * runtime cannot be know in advance it should be set to + * TST_UNLIMITED_RUNTIME. + * + * @setup: Setup callback is called once at the start of the test in order to + * prepare the test environment. + * + * @cleanup: Cleanup callback is either called at the end of the test, or in a + * case that tst_brk() was called. That means that cleanup must be + * able to handle all possible states the test can be in. This + * usually means that we have to check if file descriptor was opened + * before we attempt to close it, etc. + * + * + * @test: A main test function, only one of the tst_test.test and test_all can + * be set. When this function is set the tst_test.tcnt must be set to a + * positive integer and this function will be executed tcnt times + * during a single test iteration. May be executed several times if test + * was passed '-i' or '-d' command line parameters. + * + * @test_all: A main test function, only one of the tst_test.test and test_all + * can be set. May be executed several times if test was passed '-i' + * or '-d' command line parameters. + * + * @resource_files: A NULL terminated array of filenames that will be copied + * to the test temporary directory from the LTP datafiles + * directory. + * + * @needs_drivers: A NULL terminated array of kernel modules required to run + * the test. The module has to be build in or present in order + * for the test to run. + * + * @save_restore: A {} terminated array of /proc or /sys files that should + * saved at the start of the test and restored at the end. See + * tst_sys_conf_save() and struct tst_path_val for details. + * + * @ulimit: A {} terminated array of process limits RLIMIT_* to be adjusted for + * the test. + * + * @needs_kconfigs: A NULL terminated array of kernel config options that are + * required for the test. All strings in the array have to be + * evaluated to true for the test to run. Boolean operators + * and parenthesis are supported, e.g. + * "CONFIG_X86_INTEL_UMIP=y | CONFIG_X86_UIMP=y" is evaluated + * to true if at least one of the options is present. + * + * @bufs: A description of guarded buffers to be allocated for the test. Guarded + * buffers are buffers with poisoned page allocated right before the start + * of the buffer and canary right after the end of the buffer. See + * struct tst_buffers and tst_buffer_alloc() for details. + * + * @caps: A {} terminated array of capabilities to change before the start of + * the test. See struct tst_cap and tst_cap_setup() for details. + * + * @tags: A {} terminated array of test tags. See struct tst_tag for details. + * + * @needs_cmds: A NULL terminated array of commands required for the test to run. + * + * @needs_cgroup_ver: If set the test will run only if the specified cgroup + * version is present on the system. + * + * @needs_cgroup_ctrls: List of cgroup controllers the test needs to run. + */ + + struct tst_test { unsigned int tcnt; struct tst_option *options; const char *min_kver; - /* - * The supported_archs is a NULL terminated list of archs the test - * does support. - */ const char *const *supported_archs; - /* If set the test is compiled out */ const char *tconf_msg; int needs_tmpdir:1; @@ -186,182 +489,98 @@ struct tst_test { int needs_devfs:1; int restore_wallclock:1; - /* - * If set the test function will be executed for all available - * filesystems and the current filesystem type would be set in the - * tst_device->fs_type. - * - * The test setup and cleanup are executed before/after __EACH__ call - * to the test function. - */ int all_filesystems:1; int skip_in_lockdown:1; int skip_in_secureboot:1; int skip_in_compat:1; - /* - * If set, the hugetlbfs will be mounted at .mntpoint. - */ int needs_hugetlbfs:1; - /* - * The skip_filesystems is a NULL terminated list of filesystems the - * test does not support. It can also be used to disable whole class of - * filesystems with a special keywords such as "fuse". - */ const char *const *skip_filesystems; - /* Minimum number of online CPU required by the test */ unsigned long min_cpus; - - /* Minimum size(MB) of MemAvailable required by the test */ unsigned long min_mem_avail; - - /* Minimum size(MB) of SwapFree required by the test */ unsigned long min_swap_avail; - /* - * Two policies for reserving hugepage: - * - * TST_REQUEST: - * It will try the best to reserve available huge pages and return the number - * of available hugepages in tst_hugepages, which may be 0 if hugepages are - * not supported at all. - * - * TST_NEEDS: - * This is an enforced requirement, LTP should strictly do hpages applying and - * guarantee the 'HugePages_Free' no less than pages which makes that test can - * use these specified numbers correctly. Otherwise, test exits with TCONF if - * the attempt to reserve hugepages fails or reserves less than requested. - * - * With success test stores the reserved hugepage number in 'tst_hugepages. For - * the system without hugetlb supporting, variable 'tst_hugepages' will be set to 0. - * If the hugepage number needs to be set to 0 on supported hugetlb system, please - * use '.hugepages = {TST_NO_HUGEPAGES}'. - * - * Also, we do cleanup and restore work for the hpages resetting automatically. - */ struct tst_hugepage hugepages; - /* - * If set to non-zero, call tst_taint_init(taint_check) during setup - * and check kernel taint at the end of the test. If all_filesystems - * is non-zero, taint check will be performed after each FS test and - * testing will be terminated by TBROK if taint is detected. - */ unsigned int taint_check; - /* - * If set non-zero denotes number of test variant, the test is executed - * variants times each time with tst_variant set to different number. - * - * This allows us to run the same test for different settings. The - * intended use is to test different syscall wrappers/variants but the - * API is generic and does not limit the usage in any way. - */ unsigned int test_variants; - /* Minimal device size in megabytes */ unsigned int dev_min_size; - /* Device filesystem type override NULL == default */ const char *dev_fs_type; - /* Options passed to SAFE_MKFS() when format_device is set */ const char *const *dev_fs_opts; const char *const *dev_extra_opts; - /* Device mount options, used if mount_device is set */ const char *mntpoint; unsigned int mnt_flags; void *mnt_data; - /* - * Maximal test runtime in seconds. - * - * Any test that runs for more than a second or two should set this and - * also use tst_remaining_runtime() to exit when runtime was used up. - * Tests may finish sooner, for example if requested number of - * iterations was reached before the runtime runs out. - * - * If test runtime cannot be know in advance it should be set to - * TST_UNLIMITED_RUNTIME. - */ int max_runtime; void (*setup)(void); void (*cleanup)(void); - void (*test)(unsigned int test_nr); void (*test_all)(void); - /* Syscall name used by the timer measurement library */ const char *scall; - - /* Sampling function for timer measurement testcases */ int (*sample)(int clk_id, long long usec); - /* NULL terminated array of resource file names */ const char *const *resource_files; - - /* NULL terminated array of needed kernel drivers */ const char * const *needs_drivers; - /* - * {NULL, NULL} terminated array of (/proc, /sys) files to save - * before setup and restore after cleanup - */ const struct tst_path_val *save_restore; - /* - * {} terminated array of ulimit resource type and value. - */ const struct tst_ulimit_val *ulimit; - /* - * NULL terminated array of kernel config options required for the - * test. - */ const char *const *needs_kconfigs; - /* - * {NULL, NULL} terminated array to be allocated buffers. - */ struct tst_buffers *bufs; - /* - * {NULL, NULL} terminated array of capability settings - */ struct tst_cap *caps; - /* - * {NULL, NULL} terminated array of tags. - */ const struct tst_tag *tags; - /* NULL terminated array of required commands */ const char *const *needs_cmds; - /* Requires a particular CGroup API version. */ const enum tst_cg_ver needs_cgroup_ver; /* {} terminated array of required CGroup controllers */ const char *const *needs_cgroup_ctrls; }; -/* - * Runs tests. +/** + * tst_run_tcases() - Entry point to the test library. + * + * @argc: An argc that was passed to the main(). + * @argv: An argv that was passed to the main(). + * @self: The test description and callbacks packed in the struct tst_test + * structure. + * + * A main() function which calls this function is added to each test + * automatically by including the tst_test.h header. The test has to define the + * struct tst_test called test. + * + * This function does not return, i.e. calls exit() after the test has finished. */ void tst_run_tcases(int argc, char *argv[], struct tst_test *self) __attribute__ ((noreturn)); #define IPC_ENV_VAR "LTP_IPC_PATH" -/* - * Does library initialization for child processes started by exec() +/** + * tst_reinit() - Reinitialize the test library. * - * The LTP_IPC_PATH variable must be passed to the program environment. + * In a cases where a test child process calls exec() it no longer can access + * the test library shared memory and therefore use the test reporting + * functions, checkpoint library, etc. This function re-initializes the test + * library so that it can be used again. + * + * @important The LTP_IPC_PATH variable must be passed to the program environment. */ void tst_reinit(void); @@ -416,6 +635,12 @@ int main(int argc, char *argv[]) #endif /* TST_NO_DEFAULT_MAIN */ +/** + * TST_TEST_TCONF() - Exit tests with a TCONF message. + * + * This macro is used in test that couldn't be compiled either because current + * CPU architecture is unsupported or because of missing development libraries. + */ #define TST_TEST_TCONF(message) \ static struct tst_test test = { .tconf_msg = message } \