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(fdopendir, fstatat): New functions.

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This commit is contained in:
Jim Meyering
2005-01-19 09:58:01 +00:00
parent af5592710c
commit 158377f794
1 changed files with 89 additions and 1 deletions
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lib/openat.c
+89 -1
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@@ -1,5 +1,5 @@
/* provide a replacement openat function
Copyright (C) 2004 Free Software Foundation, Inc.
Copyright (C) 2004, 2005 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
@@ -89,3 +89,91 @@ rpl_openat (int fd, char const *filename, int flags, ...)
errno = saved_errno;
return new_fd;
}
/* Replacement for Solaris' function by the same name.
<http://www.google.com/search?q=fdopendir+site:docs.sun.com>
Simulate it by doing save_cwd/fchdir/opendir(".")/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' fdopendir. */
DIR *
fdopendir (int fd)
{
struct saved_cwd saved_cwd;
int saved_errno;
DIR *dir;
if (fd == AT_FDCWD)
return opendir (".");
if (save_cwd (&saved_cwd) != 0)
error (exit_failure, errno,
_("fdopendir: unable to record current working directory"));
if (fchdir (fd) != 0)
{
saved_errno = errno;
free_cwd (&saved_cwd);
errno = saved_errno;
return NULL;
}
dir = opendir (".");
saved_errno = errno;
if (restore_cwd (&saved_cwd) != 0)
error (exit_failure, errno,
_("fdopendir: unable to restore working directory"));
free_cwd (&saved_cwd);
errno = saved_errno;
return dir;
}
/* Replacement for Solaris' function by the same name.
<http://www.google.com/search?q=fstatat+site:docs.sun.com>
Simulate it by doing save_cwd/fchdir/(stat|lstat)/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' fstatat. */
int
fstatat (int fd, char const *filename, struct stat *st, int flag)
{
struct saved_cwd saved_cwd;
int saved_errno;
int err;
if (fd == AT_FDCWD)
return (flag == AT_SYMLINK_NOFOLLOW
? lstat (filename, st)
: stat (filename, st));
if (save_cwd (&saved_cwd) != 0)
error (exit_failure, errno,
_("fstatat: unable to record current working directory"));
if (fchdir (fd) != 0)
{
saved_errno = errno;
free_cwd (&saved_cwd);
errno = saved_errno;
return -1;
}
err = (flag == AT_SYMLINK_NOFOLLOW
? lstat (filename, st)
: stat (filename, st));
saved_errno = errno;
if (restore_cwd (&saved_cwd) != 0)
error (exit_failure, errno,
_("fstatat: unable to restore working directory"));
free_cwd (&saved_cwd);
errno = saved_errno;
return err;
}