p4-15.c

UNIX程序设计教程

#include <unistd.h>
#include <stdlib.h>
#include <limits.h>
#include "err_exit.h"
int main(int argc, char *argv[])
{
    char *ptr = malloc(PATH_MAX + 1);
    if (argc != 2){
       printf("Usage: a.out <pathname>\n");
       exit(EXIT_FAILURE);
    }
    if (chdir(argv[1]) < 0)
       err_exit("chdir failed");
    if (getwd(ptr)==NULL)
       err_exit("getwd failed");
    printf("CWD = %s\n",ptr);
    free(ptr);
}