umount.c

linux mount的源代码

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/mount.h>

int
main(int argc, char *argv[])
{
	if (argc < 2) {
		write(2, "usage: umount <mount point>\n",
		      strlen("usage: umount <mount point>\n"));
		exit(1);
	}

	if (umount(argv[1]) < 0) {
		perror(argv[1]);
		exit(2);
	}
	return 0;
}