swapoff.c

   1 #include <sys/swap.h>
   2 #include <string.h>
   3 #include <errno.h>
   4 #include <mntent.h>
   5 #include "internal.h"
   6
   7 const char      swapoff_usage[] = "swapoff block-device\n"
   8 "\n"
   9 "\tStop swapping virtual memory pages on the given device.\n";
  10
  11 extern int
  12 swapoff_fn(const struct FileInfo * i)
  13 {
  14         struct mntent   entries[100];
  15         int          count = 0;
  16         FILE *    swapsTable = setmntent("/etc/swaps", "r");
  17         struct mntent * m;
  18
  19         if (!(swapoff(i->source))) {
  20                 if ( swapsTable == 0 ) {
  21                         fprintf(stderr, "/etc/swaps: %s\n", strerror(errno));
  22                         return 1;
  23                 }
  24                 while ( (m = getmntent(swapsTable)) != 0 ) {
  25                         entries[count].mnt_fsname = strdup(m->mnt_fsname);
  26                         entries[count].mnt_dir = strdup(m->mnt_dir);
  27                         entries[count].mnt_type = strdup(m->mnt_type);
  28                         entries[count].mnt_opts = strdup(m->mnt_opts);
  29                         entries[count].mnt_freq = m->mnt_freq;
  30                         entries[count].mnt_passno = m->mnt_passno;
  31                         count++;
  32                 }
  33                 endmntent(swapsTable);
  34                 if ( (swapsTable = setmntent("/etc/swaps", "w")) ) {
  35                         int     id;
  36                         for ( id = 0; id < count; id++ ) {
  37                                 int result =
  38                                  (strcmp(entries[id].mnt_fsname, i->source)==0
  39                                  ||strcmp(entries[id].mnt_dir, i->source)==0);
  40                                 if ( result )
  41                                         continue;
  42                                 else
  43                                         addmntent(swapsTable, &entries[id]);
  44                         }
  45                         endmntent(swapsTable);
  46                 }
  47                 else if ( errno != EROFS )
  48                         fprintf(stderr, "/etc/swaps: %s\n", strerror(errno));
  49                 return (0);
  50         }
  51         return (-1);
  52 }