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/* ISC license. */
#include <skalibs/sysdeps.h>
#ifdef SKALIBS_HASOPENAT
#ifndef _ATFILE_SOURCE
#define _ATFILE_SOURCE
#endif
#include <skalibs/nonposix.h>
#include <errno.h>
#include <skalibs/fcntl.h>
#include <skalibs/unix-transactional.h>
int open3_at (int dirfd, char const *file, int flags, unsigned int mode)
{
int fd ;
do fd = openat(dirfd, file, flags, mode) ; /* all systems that support openat() have O_CLOEXEC */
while (fd == -1 && errno == EINTR) ;
return fd ;
}
#else
#include <sys/stat.h>
#include <errno.h>
#include <skalibs/fcntl.h>
#include <skalibs/djbunix.h>
#include <skalibs/unix-transactional.h>
int open3_at (int dirfd, char const *file, int flags, unsigned int mode)
{
int fd ;
int fdhere = open_read(".") ;
if (fdhere < 0) return -1 ;
if (fd_chdir(dirfd) < 0) goto errclose ;
fd = open3(file, flags, mode) ;
if (fd < 0)
{
int e = errno ;
fd_chdir(fdhere) ;
errno = e ;
goto errclose ;
}
if (fd_chdir(fdhere) < 0)
{
fd_close(fd) ;
goto errclose ;
}
fd_close(fdhere) ;
return fd ;
errclose:
fd_close(fdhere) ;
return -1 ;
}
#endif
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