68 lines
1.2 KiB
C
68 lines
1.2 KiB
C
/* mount - mount a file system Author: Andy Tanenbaum */
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#include <errno.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <unistd.h>
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#define BUFSIZE 1024
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extern int errno;
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char *mounttable = "/etc/mtab";
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char buffer[BUFSIZE];
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main(argc, argv)
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int argc;
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char *argv[];
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{
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int ro, fd;
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if (argc == 1) list();
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if (argc < 3 || argc > 4) usage();
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if (argc == 4 && *argv[3] != '-' && *(argv[3] + 1) != 'r') usage();
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ro = (argc == 4 ? 1 : 0);
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if (mount(argv[1], argv[2], ro) < 0) {
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if (errno == EINVAL) {
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std_err("mount: ");
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std_err(argv[1]);
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std_err(" is not a valid file system.\n");
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} else {
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perror("mount");
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}
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exit(1);
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}
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std_err(argv[1]);
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std_err(" mounted\n");
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if ((fd = open(mounttable, O_RDWR)) < 0) exit(1);
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lseek(fd, 0L, SEEK_END); /* seek to EOF */
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write(fd, argv[1], strlen(argv[1]));
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write(fd, " is mounted on ", 15);
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write(fd, argv[2], strlen(argv[2]));
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write(fd, "\n", 1);
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exit(0);
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}
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list()
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{
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int fd, n;
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fd = open(mounttable, O_RDONLY);
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if (fd < 0) {
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std_err("mount: cannot open ");
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std_err(mounttable);
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std_err("\n");
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exit(1);
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}
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n = read(fd, buffer, BUFSIZE);
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write(1, buffer, n);
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exit(0);
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}
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usage()
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{
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std_err("Usage: mount special name [-r]\n");
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exit(1);
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}
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