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Diffstat (limited to 'src/libunixonacid/open3_at.c')
-rw-r--r--src/libunixonacid/open3_at.c60
1 files changed, 60 insertions, 0 deletions
diff --git a/src/libunixonacid/open3_at.c b/src/libunixonacid/open3_at.c
new file mode 100644
index 0000000..d9c7222
--- /dev/null
+++ b/src/libunixonacid/open3_at.c
@@ -0,0 +1,60 @@
+/* ISC license. */
+
+#include <skalibs/sysdeps.h>
+
+#ifdef SKALIBS_HASOPENAT
+
+#ifndef _ATFILE_SOURCE
+#define _ATFILE_SOURCE
+#endif
+
+#include <skalibs/nonposix.h>
+#include <fcntl.h>
+#include <skalibs/unix-transactional.h>
+
+int open3_at (int dirfd, char const *file, int flags, unsigned int mode)
+{
+ return openat(dirfd, file, flags, mode) ;
+}
+
+#else
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.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)
+ {
+ register int e = errno ;
+ fd_close(fdhere) ;
+ errno = e ;
+ return -1 ;
+ }
+ fd = open3(file, flags, mode) ;
+ if (fd < 0)
+ {
+ register int e = errno ;
+ fd_chdir(fdhere) ;
+ fd_close(fdhere) ;
+ errno = e ;
+ return -1 ;
+ }
+ if (fd_chdir(fdhere) < 0)
+ {
+ register int e = errno ;
+ fd_close(fdhere) ;
+ errno = e ;
+ return -1 ;
+ }
+ return fd ;
+}
+
+#endif