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