xref: /freebsd/sbin/swapon/swapon.c (revision 6990ffd8a95caaba6858ad44ff1b3157d1efba8f)
1 /*
2  * Copyright (c) 1980, 1993
3  *	The Regents of the University of California.  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  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 3. All advertising materials mentioning features or use of this software
14  *    must display the following acknowledgement:
15  *	This product includes software developed by the University of
16  *	California, Berkeley and its contributors.
17  * 4. Neither the name of the University nor the names of its contributors
18  *    may be used to endorse or promote products derived from this software
19  *    without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  */
33 
34 #ifndef lint
35 static const char copyright[] =
36 "@(#) Copyright (c) 1980, 1993\n\
37 	The Regents of the University of California.  All rights reserved.\n";
38 #endif /* not lint */
39 
40 #ifndef lint
41 #if 0
42 static char sccsid[] = "@(#)swapon.c	8.1 (Berkeley) 6/5/93";
43 #endif
44 static const char rcsid[] =
45   "$FreeBSD$";
46 #endif /* not lint */
47 
48 #include <err.h>
49 #include <errno.h>
50 #include <fstab.h>
51 #include <stdio.h>
52 #include <stdlib.h>
53 #include <string.h>
54 #include <unistd.h>
55 
56 static void usage __P((void));
57 int	add __P((char *name, int ignoreebusy));
58 
59 int
60 main(int argc, char **argv)
61 {
62 	register struct fstab *fsp;
63 	register int stat;
64 	int ch, doall;
65 
66 	doall = 0;
67 	while ((ch = getopt(argc, argv, "a")) != -1)
68 		switch((char)ch) {
69 		case 'a':
70 			doall = 1;
71 			break;
72 		case '?':
73 		default:
74 			usage();
75 		}
76 	argv += optind;
77 
78 	stat = 0;
79 	if (doall)
80 		while ((fsp = getfsent()) != NULL) {
81 			if (strcmp(fsp->fs_type, FSTAB_SW))
82 				continue;
83 			if (strstr(fsp->fs_mntops, "noauto"))
84 				continue;
85 			if (add(fsp->fs_spec, 1))
86 				stat = 1;
87 			else
88 				printf("swapon: adding %s as swap device\n",
89 				    fsp->fs_spec);
90 		}
91 	else if (!*argv)
92 		usage();
93 	for (; *argv; ++argv)
94 		stat |= add(*argv, 0);
95 	exit(stat);
96 }
97 
98 int
99 add(char *name, int ignoreebusy)
100 {
101 	if (swapon(name) == -1) {
102 		switch (errno) {
103 		case EBUSY:
104 			if (!ignoreebusy)
105 				warnx("%s: device already in use", name);
106 			break;
107 		default:
108 			warn("%s", name);
109 			break;
110 		}
111 		return(1);
112 	}
113 	return(0);
114 }
115 
116 static void
117 usage()
118 {
119 	fprintf(stderr, "usage: swapon [-a] [special_file ...]\n");
120 	exit(1);
121 }
122