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https://git.busybox.net/busybox.git
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71 lines
1.6 KiB
C
71 lines
1.6 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* mountpoint implementation for busybox
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*
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* Copyright (C) 2005 Bernhard Fischer
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*
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* Licensed under the GPL v2, see the file LICENSE in this tarball.
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*
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* Based on sysvinit's mountpoint
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*/
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#include <sys/stat.h>
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#include <errno.h> /* errno */
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#include <string.h> /* strerror */
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#include <getopt.h> /* optind */
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#include "busybox.h"
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int mountpoint_main(int argc, char **argv)
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{
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int opt = bb_getopt_ulflags(argc, argv, "qdx");
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#define OPT_q (1)
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#define OPT_d (2)
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#define OPT_x (4)
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if (optind != argc - 1)
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bb_show_usage();
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{
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char *arg = argv[optind];
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struct stat st;
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if ( (opt & OPT_x && stat(arg, &st) == 0) || (lstat(arg, &st) == 0) ) {
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if (opt & OPT_x) {
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if (S_ISBLK(st.st_mode))
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{
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bb_printf("%u:%u\n", major(st.st_rdev),
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minor(st.st_rdev));
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return EXIT_SUCCESS;
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} else {
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if (opt & OPT_q)
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putchar('\n');
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else
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bb_error_msg("%s: not a block device", arg);
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}
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return EXIT_FAILURE;
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} else
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if (S_ISDIR(st.st_mode)) {
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dev_t st_dev = st.st_dev;
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ino_t st_ino = st.st_ino;
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char *p;
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bb_xasprintf(&p, "%s/..", arg);
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if (stat(p, &st) == 0) {
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short ret = (st_dev != st.st_dev) ||
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(st_dev == st.st_dev && st_ino == st.st_ino);
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if (opt & OPT_d)
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bb_printf("%u:%u\n", major(st_dev), minor(st_dev));
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else if (!(opt & OPT_q))
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bb_printf("%s is %sa mountpoint\n", arg, ret?"":"not ");
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return !ret;
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}
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} else {
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if (!(opt & OPT_q))
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bb_error_msg("%s: not a directory", arg);
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return EXIT_FAILURE;
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}
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}
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if (!(opt & OPT_q))
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bb_perror_msg(arg);
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return EXIT_FAILURE;
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}
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}
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