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    Contents of /tags/mkinitrd-6_3_3/klibc/usr/utils/mount_main.c

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    Revision 1182 - (show annotations) (download)
    Wed Dec 15 21:43:57 2010 UTC (13 years, 9 months ago) by niro
    File MIME type: text/plain
    File size: 3024 byte(s) 
    tagged 'mkinitrd-6_3_3'
    1 /*
    2 * by rmk
    3 */
    4 #include <sys/mount.h>
    5 #include <errno.h>
    6 #include <stdio.h>
    7 #include <stdlib.h>
    8 #include <string.h>
    9 #include <unistd.h>
    10 #include <mntent.h>
    11
    12 #include "mount_opts.h"
    13
    14 #define _PATH_MOUNTED "/etc/mtab"
    15 #define _PATH_PROC_MOUNTS "/proc/mounts"
    16
    17 char *progname;
    18
    19 static struct extra_opts extra;
    20 static unsigned long rwflag;
    21
    22 static __noreturn usage(void)
    23 {
    24 fprintf(stderr, "Usage: %s [-r] [-w] [-o options] [-t type] [-f] [-i] "
    25 "[-n] device directory\n", progname);
    26 exit(1);
    27 }
    28
    29 static __noreturn print_mount(char *type)
    30 {
    31 FILE *mfp;
    32 struct mntent *mnt;
    33
    34 mfp = setmntent(_PATH_PROC_MOUNTS, "r");
    35 if (!mfp)
    36 mfp = setmntent(_PATH_MOUNTED, "r");
    37 if (!mfp)
    38 perror("setmntent");
    39
    40 while ((mnt = getmntent(mfp)) != NULL) {
    41 if (mnt->mnt_fsname && !strncmp(mnt->mnt_fsname, "no", 2))
    42 continue;
    43 if (type && mnt->mnt_type && strcmp(type, mnt->mnt_type))
    44 continue;
    45 printf("%s on %s", mnt->mnt_fsname, mnt->mnt_dir);
    46 if (mnt->mnt_type != NULL && mnt->mnt_type != '\0')
    47 printf (" type %s", mnt->mnt_type);
    48 if (mnt->mnt_opts != NULL && mnt->mnt_opts != '\0')
    49 printf (" (%s)", mnt->mnt_opts);
    50 printf("\n");
    51 }
    52 endmntent(mfp);
    53 exit(0);
    54 }
    55
    56 static int
    57 do_mount(char *dev, char *dir, char *type, unsigned long rwflag, void *data)
    58 {
    59 char *s;
    60 int error = 0;
    61
    62 while ((s = strsep(&type, ",")) != NULL) {
    63 retry:
    64 if (mount(dev, dir, s, rwflag, data) == -1) {
    65 error = errno;
    66 /*
    67 * If the filesystem is not found, or the
    68 * superblock is invalid, try the next.
    69 */
    70 if (error == ENODEV || error == EINVAL)
    71 continue;
    72
    73 /*
    74 * If we get EACCESS, and we're trying to
    75 * mount readwrite and this isn't a remount,
    76 * try read only.
    77 */
    78 if (error == EACCES &&
    79 (rwflag & (MS_REMOUNT | MS_RDONLY)) == 0) {
    80 rwflag |= MS_RDONLY;
    81 goto retry;
    82 }
    83 } else {
    84 error = 0;
    85 }
    86 break;
    87 }
    88
    89 if (error) {
    90 errno = error;
    91 perror("mount");
    92 return 255;
    93 }
    94
    95 return 0;
    96 }
    97
    98 int main(int argc, char *argv[])
    99 {
    100 char *type = NULL;
    101 int c;
    102
    103 progname = argv[0];
    104 rwflag = MS_VERBOSE;
    105
    106 do {
    107 c = getopt(argc, argv, "fhino:rt:w");
    108 if (c == EOF)
    109 break;
    110 switch (c) {
    111 case 'f':
    112 /* we can't edit /etc/mtab yet anyway; exit */
    113 exit(0);
    114 case 'i':
    115 /* ignore for now; no support for mount helpers */
    116 break;
    117 case 'h':
    118 usage();
    119 case 'n':
    120 /* no mtab writing */
    121 break;
    122 case 'o':
    123 rwflag = parse_mount_options(optarg, rwflag, &extra);
    124 break;
    125 case 'r':
    126 rwflag |= MS_RDONLY;
    127 break;
    128 case 't':
    129 type = optarg;
    130 break;
    131 case 'w':
    132 rwflag &= ~MS_RDONLY;
    133 break;
    134 case '?':
    135 fprintf(stderr, "%s: invalid option -%c\n",
    136 progname, optopt);
    137 exit(1);
    138 }
    139 } while (1);
    140
    141 if (optind == argc)
    142 print_mount(type);
    143
    144 /*
    145 * If remount, bind or move was specified, then we don't
    146 * have a "type" as such. Use the dummy "none" type.
    147 */
    148 if (rwflag & MS_TYPE)
    149 type = "none";
    150
    151 if (optind + 2 != argc || type == NULL)
    152 usage();
    153
    154 return do_mount(argv[optind], argv[optind + 1], type, rwflag,
    155 extra.str);
    156 }