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Annotation of src/usr.bin/sudo/fileops.c, Revision 1.1.1.1.8.1

1.1       millert     1: /*
1.1.1.1.8.1! millert     2:  * Copyright (c) 1999, 2001 Todd C. Miller <Todd.Miller@courtesan.com>
1.1       millert     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:
1.1.1.1.8.1! millert    37: #include <sys/types.h>
        !            38: #include <sys/param.h>
        !            39: #ifdef HAVE_FLOCK
        !            40: # include <sys/file.h>
        !            41: #endif /* HAVE_FLOCK */
1.1       millert    42: #include <stdio.h>
                     43: #ifdef HAVE_UNISTD_H
1.1.1.1.8.1! millert    44: # include <unistd.h>
1.1       millert    45: #endif /* HAVE_UNISTD_H */
                     46: #include <fcntl.h>
                     47: #include <time.h>
                     48: #ifdef HAVE_UTIME
                     49: # ifdef HAVE_UTIME_H
                     50: #  include <utime.h>
                     51: # endif /* HAVE_UTIME_H */
                     52: #else
1.1.1.1.8.1! millert    53: # include "emul/utime.h"
1.1       millert    54: #endif /* HAVE_UTIME */
                     55:
                     56: #include "sudo.h"
                     57:
                     58: #ifndef lint
1.1.1.1.8.1! millert    59: static const char rcsid[] = "$Sudo: fileops.c,v 1.3 2001/12/14 19:52:47 millert Exp $";
1.1       millert    60: #endif /* lint */
                     61:
                     62: /*
                     63:  * Update the access and modify times on a file.
                     64:  */
                     65: int
                     66: touch(path, when)
                     67:     char *path;
                     68:     time_t when;
                     69: {
                     70: #ifdef HAVE_UTIME_POSIX
                     71:     struct utimbuf ut, *utp;
                     72:
                     73:     ut.actime = ut.modtime = when;
                     74:     utp = &ut;
                     75: #else
                     76:     /* BSD <= 4.3 has no struct utimbuf */
                     77:     time_t utp[2];
                     78:
                     79:     utp[0] = utp[1] = when;
                     80: #endif /* HAVE_UTIME_POSIX */
                     81:
                     82:     return(utime(path, utp));
                     83: }
                     84:
                     85: /*
                     86:  * Lock/unlock a file.
                     87:  */
                     88: #ifdef HAVE_LOCKF
                     89: int
                     90: lock_file(fd, lockit)
                     91:     int fd;
                     92:     int lockit;
                     93: {
                     94:     int op = 0;
                     95:
                     96:     switch (lockit) {
                     97:        case SUDO_LOCK:
                     98:            op = F_LOCK;
                     99:            break;
                    100:        case SUDO_TLOCK:
                    101:            op = F_TLOCK;
                    102:            break;
                    103:        case SUDO_UNLOCK:
                    104:            op = F_ULOCK;
                    105:            break;
                    106:     }
                    107:     return(lockf(fd, op, 0) == 0);
                    108: }
                    109: #elif HAVE_FLOCK
                    110: int
                    111: lock_file(fd, lockit)
                    112:     int fd;
                    113:     int lockit;
                    114: {
                    115:     int op = 0;
                    116:
                    117:     switch (lockit) {
                    118:        case SUDO_LOCK:
                    119:            op = LOCK_EX;
                    120:            break;
                    121:        case SUDO_TLOCK:
                    122:            op = LOCK_EX | LOCK_NB;
                    123:            break;
                    124:        case SUDO_UNLOCK:
1.1.1.1.8.1! millert   125:            op = LOCK_UN;
1.1       millert   126:            break;
                    127:     }
                    128:     return(flock(fd, op) == 0);
                    129: }
                    130: #else
                    131: int
                    132: lock_file(fd, lockit)
                    133:     int fd;
                    134:     int lockit;
                    135: {
                    136: #ifdef F_SETLK
                    137:     int func;
                    138:     struct flock lock;
                    139:
                    140:     lock.l_start = 0;
                    141:     lock.l_len = 0;
                    142:     lock.l_pid = getpid();
                    143:     lock.l_type = (lockit == SUDO_UNLOCK) ? F_UNLCK : F_WRLCK;
                    144:     lock.l_whence = SEEK_SET;
                    145:     func = (lockit == SUDO_TLOCK) ? F_SETLK : F_SETLKW;
                    146:
                    147:     return(fcntl(fd, func, &lock) == 0);
                    148: #else
                    149:     return(TRUE);
                    150: #endif
                    151: }
                    152: #endif