128 lines
3.0 KiB
C
128 lines
3.0 KiB
C
/*
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* Copyright (c) 1999-2005, 2007, 2009-2014
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* Todd C. Miller <Todd.Miller@courtesan.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Sponsored in part by the Defense Advanced Research Projects
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* Agency (DARPA) and Air Force Research Laboratory, Air Force
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* Materiel Command, USAF, under agreement number F39502-99-1-0512.
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*/
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#include <config.h>
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#include <sys/types.h>
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#ifdef HAVE_FLOCK
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# include <sys/file.h>
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#endif /* HAVE_FLOCK */
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#ifdef STDC_HEADERS
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# include <stdlib.h>
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# include <stddef.h>
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#else
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# ifdef HAVE_STDLIB_H
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# include <stdlib.h>
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# endif
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#endif /* STDC_HEADERS */
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#ifdef HAVE_STRING_H
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# if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
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# include <memory.h>
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# endif
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# include <string.h>
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#endif /* HAVE_STRING_H */
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#ifdef HAVE_STRINGS_H
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# include <strings.h>
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#endif /* HAVE_STRING_H */
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#if defined(HAVE_MALLOC_H) && !defined(STDC_HEADERS)
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# include <malloc.h>
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#endif /* HAVE_MALLOC_H && !STDC_HEADERS */
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#include <ctype.h>
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif /* HAVE_UNISTD_H */
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#include <fcntl.h>
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#ifdef HAVE_STDBOOL_H
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# include <stdbool.h>
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#else
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# include "compat/stdbool.h"
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#endif
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#include "missing.h"
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#include "sudo_util.h"
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#include "sudo_debug.h"
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/*
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* Lock/unlock a file.
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*/
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#ifdef HAVE_LOCKF
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bool
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sudo_lock_file_v1(int fd, int lockit)
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{
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int op = 0;
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debug_decl(sudo_lock_file, SUDO_DEBUG_UTIL)
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switch (lockit) {
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case SUDO_LOCK:
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op = F_LOCK;
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break;
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case SUDO_TLOCK:
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op = F_TLOCK;
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break;
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case SUDO_UNLOCK:
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op = F_ULOCK;
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break;
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}
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debug_return_bool(lockf(fd, op, 0) == 0);
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}
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#elif defined(HAVE_FLOCK)
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bool
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sudo_lock_file_v1(int fd, int lockit)
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{
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int op = 0;
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debug_decl(sudo_lock_file, SUDO_DEBUG_UTIL)
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switch (lockit) {
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case SUDO_LOCK:
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op = LOCK_EX;
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break;
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case SUDO_TLOCK:
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op = LOCK_EX | LOCK_NB;
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break;
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case SUDO_UNLOCK:
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op = LOCK_UN;
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break;
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}
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debug_return_bool(flock(fd, op) == 0);
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}
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#else
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bool
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sudo_lock_file_v1(int fd, int lockit)
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{
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#ifdef F_SETLK
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int func;
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struct flock lock;
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debug_decl(sudo_lock_file, SUDO_DEBUG_UTIL)
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lock.l_start = 0;
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lock.l_len = 0;
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lock.l_pid = getpid();
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lock.l_type = (lockit == SUDO_UNLOCK) ? F_UNLCK : F_WRLCK;
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lock.l_whence = SEEK_SET;
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func = (lockit == SUDO_LOCK) ? F_SETLKW : F_SETLK;
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debug_return_bool(fcntl(fd, func, &lock) == 0);
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#else
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return true;
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#endif
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}
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#endif
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