64 lines
1.2 KiB
C
64 lines
1.2 KiB
C
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdbool.h>
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#include <sys/vfs.h>
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#include "findfs.h"
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/* verify that a mountpoint is actually the type we want */
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int valid_mountpoint(const char *mount, long magic)
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{
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struct statfs st_fs;
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if (statfs(mount, &st_fs) < 0)
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return -ENOENT;
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else if ((long)st_fs.f_type != magic)
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return -ENOENT;
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return 0;
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}
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/* find the path to a mounted file system */
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const char *find_mountpoint(const char *fstype, long magic,
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char *mountpoint, int len,
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const char * const *known_mountpoints)
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{
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const char * const *ptr;
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char format[128];
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char type[100];
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FILE *fp;
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if (known_mountpoints) {
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ptr = known_mountpoints;
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while (*ptr) {
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if (valid_mountpoint(*ptr, magic) == 0) {
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strncpy(mountpoint, *ptr, len - 1);
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mountpoint[len-1] = 0;
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return mountpoint;
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}
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ptr++;
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}
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}
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/* give up and parse /proc/mounts */
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fp = fopen("/proc/mounts", "r");
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if (fp == NULL)
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return NULL;
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snprintf(format, 128, "%%*s %%%ds %%99s %%*s %%*d %%*d\n", len);
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while (fscanf(fp, format, mountpoint, type) == 2) {
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if (strcmp(type, fstype) == 0)
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break;
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}
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fclose(fp);
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if (strcmp(type, fstype) != 0)
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return NULL;
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return mountpoint;
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}
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