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Annotation of src/usr.bin/sudo/fileops.c, Revision 1.1

1.1     ! millert     1: /*
        !             2:  * Copyright (c) 1999 Todd C. Miller <Todd.Miller@courtesan.com>
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  *
        !             9:  * 1. Redistributions of source code must retain the above copyright
        !            10:  *    notice, this list of conditions and the following disclaimer.
        !            11:  *
        !            12:  * 2. Redistributions in binary form must reproduce the above copyright
        !            13:  *    notice, this list of conditions and the following disclaimer in the
        !            14:  *    documentation and/or other materials provided with the distribution.
        !            15:  *
        !            16:  * 3. The name of the author may not be used to endorse or promote products
        !            17:  *    derived from this software without specific prior written permission.
        !            18:  *
        !            19:  * 4. Products derived from this software may not be called "Sudo" nor
        !            20:  *    may "Sudo" appear in their names without specific prior written
        !            21:  *    permission from the author.
        !            22:  *
        !            23:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
        !            24:  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
        !            25:  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
        !            26:  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
        !            27:  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
        !            28:  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
        !            29:  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
        !            30:  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
        !            31:  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
        !            32:  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
        !            33:  */
        !            34:
        !            35: #include "config.h"
        !            36:
        !            37: #include <stdio.h>
        !            38: #ifdef HAVE_UNISTD_H
        !            39: #include <unistd.h>
        !            40: #endif /* HAVE_UNISTD_H */
        !            41: #include <fcntl.h>
        !            42: #include <time.h>
        !            43: #include <sys/types.h>
        !            44: #include <sys/param.h>
        !            45: #ifdef HAVE_UTIME
        !            46: # ifdef HAVE_UTIME_H
        !            47: #  include <utime.h>
        !            48: # endif /* HAVE_UTIME_H */
        !            49: #else
        !            50: #  include "emul/utime.h"
        !            51: #endif /* HAVE_UTIME */
        !            52:
        !            53: #include "sudo.h"
        !            54:
        !            55: #ifndef lint
        !            56: static const char rcsid[] = "$Sudo: fileops.c,v 1.1 1999/08/07 09:59:43 millert Exp $";
        !            57: #endif /* lint */
        !            58:
        !            59: /*
        !            60:  * Update the access and modify times on a file.
        !            61:  */
        !            62: int
        !            63: touch(path, when)
        !            64:     char *path;
        !            65:     time_t when;
        !            66: {
        !            67: #ifdef HAVE_UTIME_POSIX
        !            68:     struct utimbuf ut, *utp;
        !            69:
        !            70:     ut.actime = ut.modtime = when;
        !            71:     utp = &ut;
        !            72: #else
        !            73:     /* BSD <= 4.3 has no struct utimbuf */
        !            74:     time_t utp[2];
        !            75:
        !            76:     utp[0] = utp[1] = when;
        !            77: #endif /* HAVE_UTIME_POSIX */
        !            78:
        !            79:     return(utime(path, utp));
        !            80: }
        !            81:
        !            82: /*
        !            83:  * Lock/unlock a file.
        !            84:  */
        !            85: #ifdef HAVE_LOCKF
        !            86: int
        !            87: lock_file(fd, lockit)
        !            88:     int fd;
        !            89:     int lockit;
        !            90: {
        !            91:     int op = 0;
        !            92:
        !            93:     switch (lockit) {
        !            94:        case SUDO_LOCK:
        !            95:            op = F_LOCK;
        !            96:            break;
        !            97:        case SUDO_TLOCK:
        !            98:            op = F_TLOCK;
        !            99:            break;
        !           100:        case SUDO_UNLOCK:
        !           101:            op = F_ULOCK;
        !           102:            break;
        !           103:     }
        !           104:     return(lockf(fd, op, 0) == 0);
        !           105: }
        !           106: #elif HAVE_FLOCK
        !           107: int
        !           108: lock_file(fd, lockit)
        !           109:     int fd;
        !           110:     int lockit;
        !           111: {
        !           112:     int op = 0;
        !           113:
        !           114:     switch (lockit) {
        !           115:        case SUDO_LOCK:
        !           116:            op = LOCK_EX;
        !           117:            break;
        !           118:        case SUDO_TLOCK:
        !           119:            op = LOCK_EX | LOCK_NB;
        !           120:            break;
        !           121:        case SUDO_UNLOCK:
        !           122:            op = LOCK_EX;
        !           123:            break;
        !           124:     }
        !           125:     return(flock(fd, op) == 0);
        !           126: }
        !           127: #else
        !           128: int
        !           129: lock_file(fd, lockit)
        !           130:     int fd;
        !           131:     int lockit;
        !           132: {
        !           133: #ifdef F_SETLK
        !           134:     int func;
        !           135:     struct flock lock;
        !           136:
        !           137:     lock.l_start = 0;
        !           138:     lock.l_len = 0;
        !           139:     lock.l_pid = getpid();
        !           140:     lock.l_type = (lockit == SUDO_UNLOCK) ? F_UNLCK : F_WRLCK;
        !           141:     lock.l_whence = SEEK_SET;
        !           142:     func = (lockit == SUDO_TLOCK) ? F_SETLK : F_SETLKW;
        !           143:
        !           144:     return(fcntl(fd, func, &lock) == 0);
        !           145: #else
        !           146:     return(TRUE);
        !           147: #endif
        !           148: }
        !           149: #endif