Annotation of src/usr.bin/sudo/fileops.c, Revision 1.3
1.1 millert 1: /*
1.2 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.
1.3 ! millert 33: *
! 34: * Sponsored in part by the Defense Advanced Research Projects
! 35: * Agency (DARPA) and Air Force Research Laboratory, Air Force
! 36: * Materiel Command, USAF, under agreement number F39502-99-1-0512.
1.1 millert 37: */
38:
39: #include "config.h"
40:
1.2 millert 41: #include <sys/types.h>
42: #include <sys/param.h>
43: #ifdef HAVE_FLOCK
44: # include <sys/file.h>
45: #endif /* HAVE_FLOCK */
1.1 millert 46: #include <stdio.h>
47: #ifdef HAVE_UNISTD_H
1.2 millert 48: # include <unistd.h>
1.1 millert 49: #endif /* HAVE_UNISTD_H */
50: #include <fcntl.h>
51: #include <time.h>
52: #ifdef HAVE_UTIME
53: # ifdef HAVE_UTIME_H
54: # include <utime.h>
55: # endif /* HAVE_UTIME_H */
56: #else
1.2 millert 57: # include "emul/utime.h"
1.1 millert 58: #endif /* HAVE_UTIME */
59:
60: #include "sudo.h"
61:
62: #ifndef lint
1.3 ! millert 63: static const char rcsid[] = "$Sudo: fileops.c,v 1.4 2003/04/16 00:42:10 millert Exp $";
1.1 millert 64: #endif /* lint */
65:
66: /*
67: * Update the access and modify times on a file.
68: */
69: int
70: touch(path, when)
71: char *path;
72: time_t when;
73: {
74: #ifdef HAVE_UTIME_POSIX
75: struct utimbuf ut, *utp;
76:
77: ut.actime = ut.modtime = when;
78: utp = &ut;
79: #else
80: /* BSD <= 4.3 has no struct utimbuf */
81: time_t utp[2];
82:
83: utp[0] = utp[1] = when;
84: #endif /* HAVE_UTIME_POSIX */
85:
86: return(utime(path, utp));
87: }
88:
89: /*
90: * Lock/unlock a file.
91: */
92: #ifdef HAVE_LOCKF
93: int
94: lock_file(fd, lockit)
95: int fd;
96: int lockit;
97: {
98: int op = 0;
99:
100: switch (lockit) {
101: case SUDO_LOCK:
102: op = F_LOCK;
103: break;
104: case SUDO_TLOCK:
105: op = F_TLOCK;
106: break;
107: case SUDO_UNLOCK:
108: op = F_ULOCK;
109: break;
110: }
111: return(lockf(fd, op, 0) == 0);
112: }
113: #elif HAVE_FLOCK
114: int
115: lock_file(fd, lockit)
116: int fd;
117: int lockit;
118: {
119: int op = 0;
120:
121: switch (lockit) {
122: case SUDO_LOCK:
123: op = LOCK_EX;
124: break;
125: case SUDO_TLOCK:
126: op = LOCK_EX | LOCK_NB;
127: break;
128: case SUDO_UNLOCK:
1.2 millert 129: op = LOCK_UN;
1.1 millert 130: break;
131: }
132: return(flock(fd, op) == 0);
133: }
134: #else
135: int
136: lock_file(fd, lockit)
137: int fd;
138: int lockit;
139: {
140: #ifdef F_SETLK
141: int func;
142: struct flock lock;
143:
144: lock.l_start = 0;
145: lock.l_len = 0;
146: lock.l_pid = getpid();
147: lock.l_type = (lockit == SUDO_UNLOCK) ? F_UNLCK : F_WRLCK;
148: lock.l_whence = SEEK_SET;
149: func = (lockit == SUDO_TLOCK) ? F_SETLK : F_SETLKW;
150:
151: return(fcntl(fd, func, &lock) == 0);
152: #else
153: return(TRUE);
154: #endif
155: }
156: #endif
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