/*
* A swapon(8)/swapoff(8) for Linux 0.99.
* swapon.c,v 1.1.1.1 1993/11/18 08:40:51 jrs Exp
+ * Added '-s' (Summary option) <Vincent.Renardias@waw.com> 02/1997.
*/
-#include "sundries.h"
+#include <stdlib.h>
+#include <stdio.h>
+#include <getopt.h>
+#include <string.h>
+#include <mntent.h>
+#include <errno.h>
+#include "swap.h"
+#include "swapargs.h"
+
+#define streq(s, t) (strcmp ((s), (t)) == 0)
+
+#define _PATH_FSTAB "/etc/fstab"
+#define PROC_SWAPS "/proc/swaps"
+
+/* #define SWAPON_NEEDS_TWO_ARGS */
/* Nonzero for chatty (-v). This is a nonstandard flag (not in BSD). */
int verbose = 0;
-#ifdef SUPPORT_PRIORITIES
int priority = -1; /* non-prioritized swap by default */
-#endif
extern char version[];
static char *program_name;
{
{ "all", 0, 0, 'a' },
{ "help", 0, 0, 'h' },
-#ifdef SUPPORT_PRIORITIES
{ "priority", required_argument, 0, 'p' },
-#endif
+ { "summary", 0, 0, 's' },
{ "verbose", 0, 0, 'v' },
{ "version", 0, 0, 'V' },
{ NULL, 0, 0, 0 }
};
-#ifdef SUPPORT_PRIORITIES
-const char *usage_string = "\
-usage: %s [-hV]\n\
- %s -a [-v]\n\
- %s [-v] [-p priority] special ...\n\
-";
-#else
const char *usage_string = "\
usage: %s [-hV]\n\
%s -a [-v]\n\
%s [-v] [-p priority] special ...\n\
+ %s [-s]\n\
";
-#endif
static void
usage (FILE *fp, int n)
{
- fprintf (fp, usage_string, program_name, program_name, program_name);
+ fprintf (fp, usage_string, program_name, program_name, program_name, program_name);
exit (n);
}
-static int
-#ifdef SUPPORT_PRIORITIES
-swap (const char *special, int prio)
+#ifdef SWAPON_HAS_TWO_ARGS
+#define SWAPON_NEEDS_TWO_ARGS
+#endif
+
+#ifdef SWAPON_NEEDS_TWO_ARGS
+#ifdef SWAPON_HAS_TWO_ARGS
+/* libc is OK */
+#include <unistd.h>
+#else
+/* We want a swapon with two args, but have an old libc.
+ Build the kernel call by hand. */
+#include <linux/unistd.h>
+static
+_syscall2(int, swapon, const char *, path, int, flags);
+static
+_syscall1(int, swapoff, const char *, path);
+#endif
#else
-swap (const char *special)
+/* just do as libc says */
+#include <unistd.h>
#endif
+
+static int
+swap (const char *special, int prio)
{
int status;
-#ifdef SUPPORT_PRIORITIES
- int flags;
-#endif
if (verbose)
printf("%s on device %s\n", program_name, special);
if (streq (program_name, "swapon")) {
-#ifdef SUPPORT_PRIORITIES
- flags = 0;
+#ifdef SWAPON_NEEDS_TWO_ARGS
+ int flags = 0;
+
+#ifdef SWAP_FLAG_PREFER
if (prio >= 0) {
+ if (prio > SWAP_FLAG_PRIO_MASK)
+ prio = SWAP_FLAG_PRIO_MASK;
flags = SWAP_FLAG_PREFER
| ((prio & SWAP_FLAG_PRIO_MASK) << SWAP_FLAG_PRIO_SHIFT);
}
+#endif
status = swapon (special, flags);
#else
status = swapon (special);
return status;
}
+static int
+display_summary(void)
+{
+ FILE *swaps;
+ char line[200] ;
+
+ if ((swaps = fopen(PROC_SWAPS, "r")) == NULL) {
+ fprintf (stderr, "%s: %s: %s\n", program_name, PROC_SWAPS,
+ strerror (errno));
+ return -1 ;
+ }
+ while ( fgets(line, sizeof(line), swaps))
+ printf ("%s", line);
+
+ return 0 ;
+}
+
int
main (int argc, char *argv[])
{
- struct fstab *fstab;
+ struct mntent *fstab;
int status;
int all = 0;
int c;
else
program_name = argv[0];
-#ifdef SUPPORT_PRIORITIES
- while ((c = getopt_long (argc, argv, "ahp:vV", longopts, NULL)) != EOF)
-#else
- while ((c = getopt_long (argc, argv, "ahvV", longopts, NULL)) != EOF)
-#endif
+ while ((c = getopt_long (argc, argv, "ahp:svV", longopts, NULL)) != EOF)
switch (c)
{
case 'a': /* all */
case 'h': /* help */
usage (stdout, 0);
break;
-#ifdef SUPPORT_PRIORITIES
case 'p': /* priority */
priority = atoi(optarg);
break;
-#endif
+ case 's': /* tell about current use of swap areas */
+ status = display_summary();
+ exit(status);
case 'v': /* be chatty */
++verbose;
break;
case 'V': /* version */
- printf ("swapon: %s\n", version);
+ printf ("%s: %s\n", program_name, version);
exit (0);
case 0:
break;
status = 0;
- if (all)
- {
- while ((fstab = getfsent()) != NULL)
- if (streq (fstab->fs_type, FSTAB_SW))
- {
-#ifdef SUPPORT_PRIORITIES
- /* parse mount options; */
- char *opt, *opts = strdup(fstab->fs_mntopts);
+ if (all) {
+ FILE *fp = setmntent(_PATH_FSTAB, "r");
+ if (fp == NULL) {
+ fprintf(stderr, "%s: cannot open %s: %s\n", program_name,
+ _PATH_FSTAB, strerror(errno));
+ exit(2);
+ }
+ while ((fstab = getmntent(fp)) != NULL) {
+ if (streq (fstab->mnt_type, MNTTYPE_SWAP)) {
+ /* parse mount options; */
+ char *opt, *opts = strdup(fstab->mnt_opts);
- for (opt = strtok (opts, ",");
- opt != NULL;
- opt = strtok (NULL, ","))
- {
- if (strncmp(opt, "pri=", 4) == 0)
- {
- priority = atoi(opt+4);
- }
- }
- status |= swap (fstab->fs_spec, priority);
-#else
- status |= swap (fstab->fs_spec);
-#endif
- }
- }
- else if (*argv == NULL)
- {
- usage (stderr, 2);
- }
- else
- {
- while (*argv != NULL) {
-#ifdef SUPPORT_PRIORITIES
- status |= swap (*argv++,priority);
-#else
- status |= swap (*argv++);
-#endif
+ for (opt = strtok (opts, ","); opt != NULL;
+ opt = strtok (NULL, ","))
+ if (strncmp(opt, "pri=", 4) == 0)
+ priority = atoi(opt+4);
+ status |= swap (fstab->mnt_fsname, priority);
+ }
}
- }
+ } else if (*argv == NULL) {
+ usage (stderr, 2);
+ } else {
+ while (*argv != NULL)
+ status |= swap (*argv++,priority);
+ }
return status;
}
projects / thirdparty / util-linux.git / blobdiff