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(unlinkat): New function.

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This commit is contained in:
Jim Meyering 2005-09-19 15:45:05 +00:00
parent a1052bb3d9
commit ee8931ea8e
1 changed files with 40 additions and 0 deletions
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40
lib/openat.c
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@ -170,3 +170,43 @@ fstatat (int fd, char const *file, struct stat *st, int flag)
errno = saved_errno;
return err;
}
/* Replacement for Solaris' function by the same name.
<http://www.google.com/search?q=unlinkat+site:docs.sun.com>
Simulate it by doing save_cwd/fchdir/(unlink|rmdir)/restore_cwd.
If either the save_cwd or the restore_cwd fails (relatively unlikely,
and usually indicative of a problem that deserves close attention),
then give a diagnostic and exit nonzero.
Otherwise, this function works just like Solaris' unlinkat. */
int
unlinkat (int fd, char const *file, int flag)
{
struct saved_cwd saved_cwd;
int saved_errno;
int err;
if (fd == AT_FDCWD)
return (flag == AT_REMOVEDIR ? rmdir (file) : unlink (file));
if (save_cwd (&saved_cwd) != 0)
openat_save_fail (errno);
if (fchdir (fd) != 0)
{
saved_errno = errno;
free_cwd (&saved_cwd);
errno = saved_errno;
return -1;
}
err = (flag == AT_REMOVEDIR ? rmdir (file) : unlink (file));
saved_errno = errno;
if (restore_cwd (&saved_cwd) != 0)
openat_restore_fail (errno);
free_cwd (&saved_cwd);
errno = saved_errno;
return err;
}