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-rw-r--r-- | lib/openat.c | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/lib/openat.c b/lib/openat.c new file mode 100644 index 000000000..66da3c82a --- /dev/null +++ b/lib/openat.c @@ -0,0 +1,75 @@ +/* provide a replacement openat function + Copyright (C) 2004 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 + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software Foundation, + Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +/* written by Jim Meyering */ + +#include <config.h> + +/* Disable the definition of openat to rpl_openat (from config.h) in this + file. Otherwise, we'd get conflicting prototypes for rpl_openat on + most systems. */ +#undef openat + +#include <stdlib.h> +#include <unistd.h> +#include <errno.h> +#include <fcntl.h> + +#include "openat.h" + +#include "error.h" +#include "save-cwd.h" + +#include "gettext.h" +#define _(msgid) gettext (msgid) + +// FIXME +// int openat (int fildes, const char *path, int oflag, /* mode_t mode */...); + +/* Replacement for Solaris' openat function. + Simulate it by doing save_cwd/fchdir/open/restore_cwd. + If either the fchdir or the restore_cwd fails, then exit nonzero. */ +int +rpl_openat (int fd, char const *filename, int flags) +{ + struct saved_cwd saved_cwd; + int saved_errno = 0; + int new_fd; + + if (fd == AT_FDCWD || *filename == '/') + return open (filename, flags); + + if (save_cwd (&saved_cwd) != 0) + error (EXIT_FAILURE, errno, + _("openat: unable to record current working directory")); + if (fchdir (fd) != 0) + { + free_cwd (&saved_cwd); + return -1; + } + + new_fd = open (filename, flags); + if (new_fd < 0) + saved_errno = errno; + + if (restore_cwd (&saved_cwd) != 0) + error (EXIT_FAILURE, errno, + _("openat: unable to restore working directory")); + errno = saved_errno; + + return new_fd; +} |