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[PULL,18/42] osdep: Make qemu_madvise() to set errno in all cases

Message ID 20240608083415.2769160-19-pbonzini@redhat.com
State New
Headers show
Series [PULL,01/42] target/i386: fix pushed value of EFLAGS.RF | expand

Commit Message

Paolo Bonzini June 8, 2024, 8:33 a.m. UTC 
From: Michal Privoznik <mprivozn@redhat.com>

The unspoken premise of qemu_madvise() is that errno is set on
error. And it is mostly the case except for posix_madvise() which
is documented to return either zero (on success) or a positive
error number. This means, we must set errno ourselves. And while
at it, make the function return a negative value on error, just
like other error paths do.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Message-ID: <af17113e7c1f2cc909ffd36d23f5a411b63b8764.1717584048.git.mprivozn@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 util/osdep.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)
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Patch

diff --git a/util/osdep.c b/util/osdep.c
index e996c4744af..e42f4e8121d 100644
--- a/util/osdep.c
+++ b/util/osdep.c
@@ -57,7 +57,12 @@  int qemu_madvise(void *addr, size_t len, int advice)
 #if defined(CONFIG_MADVISE)
     return madvise(addr, len, advice);
 #elif defined(CONFIG_POSIX_MADVISE)
-    return posix_madvise(addr, len, advice);
+    int rc = posix_madvise(addr, len, advice);
+    if (rc) {
+        errno = rc;
+        return -1;
+    }
+    return 0;
 #else
     errno = EINVAL;
     return -1;