Mercurial > gnulib
view lib/truncate.c @ 40189:3ba41edecde6
progreloc: Speed up executable lookup on various platforms.
* lib/progreloc.c: Include <errno.h>.
(safe_read, full_read): New functions.
(find_executable): On GNU/kFreeBSD, FreeBSD, DragonFly, NetBSD, Solaris,
prefer the information from the /proc file system to a PATH search.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Tue, 19 Feb 2019 21:42:54 +0100 |
parents | b06060465f09 |
children |
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/* truncate emulations for native Windows. Copyright (C) 2017-2019 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 3, 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, see <https://www.gnu.org/licenses/>. */ #include <config.h> /* Specification. */ #include <unistd.h> #include <errno.h> #include <fcntl.h> int truncate (const char *filename, off_t length) { int fd; if (length == 0) { fd = open (filename, O_WRONLY | O_TRUNC); if (fd < 0) return -1; } else { fd = open (filename, O_WRONLY); if (fd < 0) return -1; if (ftruncate (fd, length) < 0) { int saved_errno = errno; close (fd); errno = saved_errno; return -1; } } close (fd); return 0; }