1 /*
2 * Copyright (c) 1999, 2001 Todd C. Miller <Todd.Miller@courtesan.com>
3 *
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 *
16 * Sponsored in part by the Defense Advanced Research Projects
17 * Agency (DARPA) and Air Force Research Laboratory, Air Force
18 * Materiel Command, USAF, under agreement number F39502-99-1-0512.
19 */
20
21 #include "config.h"
22
23 #include <sys/types.h>
24 #include <sys/param.h>
25 #include <sys/time.h>
26 #ifdef HAVE_FLOCK
27 # include <sys/file.h>
28 #endif /* HAVE_FLOCK */
29 #include <stdio.h>
30 #ifdef HAVE_UNISTD_H
31 # include <unistd.h>
32 #endif /* HAVE_UNISTD_H */
33 #include <fcntl.h>
34 #include <time.h>
35
36 #include "sudo.h"
37
38 #ifndef lint
39 static const char rcsid[] = "$Sudo: fileops.c,v 1.9 2004/09/08 15:48:23 millert Exp $";
40 #endif /* lint */
41
42 /*
43 * Update the access and modify times on an fd or file.
44 */
45 int
touch(fd,path,tsp)46 touch(fd, path, tsp)
47 int fd;
48 char *path;
49 struct timespec *tsp;
50 {
51 struct timeval times[2];
52
53 if (tsp != NULL) {
54 times[0].tv_sec = times[1].tv_sec = tsp->tv_sec;
55 times[0].tv_usec = times[1].tv_usec = tsp->tv_nsec / 1000;
56 }
57
58 #if defined(HAVE_FUTIME) || defined(HAVE_FUTIMES)
59 if (fd != -1)
60 return(futimes(fd, tsp ? times : NULL));
61 else
62 #endif
63 if (path != NULL)
64 return(utimes(path, tsp ? times : NULL));
65 else
66 return(-1);
67 }
68
69 /*
70 * Lock/unlock a file.
71 */
72 #ifdef HAVE_LOCKF
73 int
lock_file(fd,lockit)74 lock_file(fd, lockit)
75 int fd;
76 int lockit;
77 {
78 int op = 0;
79
80 switch (lockit) {
81 case SUDO_LOCK:
82 op = F_LOCK;
83 break;
84 case SUDO_TLOCK:
85 op = F_TLOCK;
86 break;
87 case SUDO_UNLOCK:
88 op = F_ULOCK;
89 break;
90 }
91 return(lockf(fd, op, 0) == 0);
92 }
93 #elif HAVE_FLOCK
94 int
lock_file(fd,lockit)95 lock_file(fd, lockit)
96 int fd;
97 int lockit;
98 {
99 int op = 0;
100
101 switch (lockit) {
102 case SUDO_LOCK:
103 op = LOCK_EX;
104 break;
105 case SUDO_TLOCK:
106 op = LOCK_EX | LOCK_NB;
107 break;
108 case SUDO_UNLOCK:
109 op = LOCK_UN;
110 break;
111 }
112 return(flock(fd, op) == 0);
113 }
114 #else
115 int
lock_file(fd,lockit)116 lock_file(fd, lockit)
117 int fd;
118 int lockit;
119 {
120 #ifdef F_SETLK
121 int func;
122 struct flock lock;
123
124 lock.l_start = 0;
125 lock.l_len = 0;
126 lock.l_pid = getpid();
127 lock.l_type = (lockit == SUDO_UNLOCK) ? F_UNLCK : F_WRLCK;
128 lock.l_whence = SEEK_SET;
129 func = (lockit == SUDO_TLOCK) ? F_SETLK : F_SETLKW;
130
131 return(fcntl(fd, func, &lock) == 0);
132 #else
133 return(TRUE);
134 #endif
135 }
136 #endif
137