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author | Paul Eggert <eggert@cs.ucla.edu> | 2004-08-06 05:21:37 +0000 |
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committer | Paul Eggert <eggert@cs.ucla.edu> | 2004-08-06 05:21:37 +0000 |
commit | be1c8adeedf52b5ceee7091a43c1937ea2caaa7d (patch) | |
tree | ec04fcefa847aac482de13b2ecfeef51fc296847 /lib/open-safer.c | |
parent | 7b86224d4b04021cfc8fdea5bb254b67525c77a5 (diff) | |
download | gnulib-be1c8adeedf52b5ceee7091a43c1937ea2caaa7d.tar.gz |
Merge from coreutils.
Diffstat (limited to 'lib/open-safer.c')
-rw-r--r-- | lib/open-safer.c | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/lib/open-safer.c b/lib/open-safer.c new file mode 100644 index 0000000000..ff7f45d448 --- /dev/null +++ b/lib/open-safer.c @@ -0,0 +1,75 @@ +/* Invoke open, but avoid some glitches. + + 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 Paul Eggert. */ + +#if HAVE_CONFIG_H +# include <config.h> +#endif + +#include <fcntl-safer.h> + +#include <unistd-safer.h> + +#include <errno.h> +#include <stdarg.h> + +#if HAVE_FCNTL_H +# include <fcntl.h> +#endif + +#if HAVE_UNISTD_H +# include <unistd.h> +#endif +#ifndef STDERR_FILENO +# define STDERR_FILENO 2 +#endif + +/* Like open, but do not return STDIN_FILENO, STDOUT_FILENO, or + STDERR_FILENO. */ + +int +open_safer (char const *file, int oflag, ...) +{ + int fd; + mode_t mode = 0; + + if (oflag & O_CREAT) + { + va_list args; + va_start (args, oflag); + if (sizeof (int) <= sizeof (mode_t)) + mode = va_arg (args, mode_t); + else + mode = va_arg (args, int); + va_end (args); + } + + fd = open (file, oflag, mode); + + if (0 <= fd && fd <= STDERR_FILENO) + { + int f = dup_safer (fd); + int e = errno; + close (fd); + errno = e; + fd = f; + } + + return fd; +} |