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Use lockf() when flock() is not available

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On Solaris flock() is not available, and we should use instead lockf()
or fcntl().
This commit is contained in:
Guillem Jover 2023-04-10 23:10:40 +02:00
parent fe16f3863e
commit 1fb6c3f4ce
2 changed files with 24 additions and 6 deletions
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1
configure.ac
View File

@ -290,6 +290,7 @@ __register_atfork(NULL, NULL, NULL, __dso_handle);
AC_CHECK_FUNCS([\ AC_CHECK_FUNCS([\
clearenv \ clearenv \
dirfd \ dirfd \
flock \
fopencookie \ fopencookie \
__fpurge \ __fpurge \
getauxval \ getauxval \

29
src/flopen.c
View File

@ -38,6 +38,27 @@
#include <libutil.h> #include <libutil.h>
static int
lock_file(int fd, int flags)
{
int operation;
#if HAVE_FLOCK
operation = LOCK_EX;
if (flags & O_NONBLOCK)
operation |= LOCK_NB;
return flock(fd, operation);
#else
if (flags & O_NONBLOCK)
operation = F_TLOCK;
else
operation = F_LOCK;
return lockf(fd, operation, 0);
#endif
}
/* /*
* Reliably open and lock a file. * Reliably open and lock a file.
* *
@ -49,7 +70,7 @@
static int static int
vflopenat(int dirfd, const char *path, int flags, va_list ap) vflopenat(int dirfd, const char *path, int flags, va_list ap)
{ {
int fd, operation, serrno, trunc; int fd, serrno, trunc;
struct stat sb, fsb; struct stat sb, fsb;
mode_t mode; mode_t mode;
@ -62,10 +83,6 @@ vflopenat(int dirfd, const char *path, int flags, va_list ap)
mode = (mode_t)va_arg(ap, int); /* mode_t promoted to int */ mode = (mode_t)va_arg(ap, int); /* mode_t promoted to int */
} }
operation = LOCK_EX;
if (flags & O_NONBLOCK)
operation |= LOCK_NB;
trunc = (flags & O_TRUNC); trunc = (flags & O_TRUNC);
flags &= ~O_TRUNC; flags &= ~O_TRUNC;
@ -73,7 +90,7 @@ vflopenat(int dirfd, const char *path, int flags, va_list ap)
if ((fd = openat(dirfd, path, flags, mode)) == -1) if ((fd = openat(dirfd, path, flags, mode)) == -1)
/* non-existent or no access */ /* non-existent or no access */
return (-1); return (-1);
if (flock(fd, operation) == -1) { if (lock_file(fd, flags) == -1) {
/* unsupported or interrupted */ /* unsupported or interrupted */
serrno = errno; serrno = errno;
(void)close(fd); (void)close(fd);