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author | Jim Meyering <jim@meyering.net> | 2001-03-03 19:05:36 +0000 |
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committer | Jim Meyering <jim@meyering.net> | 2001-03-03 19:05:36 +0000 |
commit | 62eab23e81750497032acc288e78de2659866776 (patch) | |
tree | 90a5ef9599d3d2aaaeadf0a9e7a41f2e39a11d45 /lib/dup-safer.c | |
parent | 4518931c297b65dcfce1e864826bff755d6f7414 (diff) | |
download | coreutils-62eab23e81750497032acc288e78de2659866776.tar.xz |
from Paul Eggert
Diffstat (limited to 'lib/dup-safer.c')
-rw-r--r-- | lib/dup-safer.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/lib/dup-safer.c b/lib/dup-safer.c new file mode 100644 index 000000000..f72fd845f --- /dev/null +++ b/lib/dup-safer.c @@ -0,0 +1,62 @@ +/* Invoke dup, but avoid some glitches. + Copyright (C) 2001 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 <errno.h> +#ifndef errno +extern int errno; +#endif + +#if HAVE_FCNTL_H +# include <fcntl.h> +#endif + +#if HAVE_UNISTD_H +# include <unistd.h> +#endif +#ifndef STDERR_FILENO +# define STDERR_FILENO 2 +#endif + +#include <unistd-safer.h> + +/* Like dup, but do not return STDIN_FILENO, STDOUT_FILENO, or + STDERR_FILENO. */ + +int +dup_safer (int fd) +{ +#ifdef F_DUPFD + return fcntl (fd, F_DUPFD, STDERR_FILENO + 1); +#else + int f = dup (fd); + if (0 <= f && f <= STDERR_FILENO) + { + int f1 = dup_safer (f); + int e = errno; + close (f); + errno = e; + f = f1; + } + return f; +#endif +} |