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  • linux之getcwd函数解析

    [lingyun@localhost getcwd]$ cat getcwd.c
    /*********************************************************************************
     *      Copyright:  (C) 2013 fulinux<fulinux@sina.com> 
     *                  All rights reserved.
     *
     *       Filename:  getcwd.c
     *    Description:  This file 
     *                 
     *        Version:  1.0.0(08/06/2013~)
     *         Author:  fulinux <fulinux@sina.com>
     *      ChangeLog:  1, Release initial version on "08/06/2013 03:56:30 PM"
     *                 
     ********************************************************************************/


    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include <unistd.h>


    int main(void)
    {
        char *ptr;
        int size = 50;
        if(chdir("/usr/tmp/yum-lingyun-sYjnfB") < 0)
        {
            perror("chdir");
            exit(1);
        }
        ptr = malloc(size);


        if(getcwd(ptr, size) == NULL)
        {
            perror("getcwd");
            exit(1);
        }


        printf("cwd = %s ", ptr);
        exit(0);


    }
    [lingyun@localhost getcwd]$ ll /usr/
    total 224
    dr-xr-xr-x.   2 root root 69632 Apr 29 03:32 bin
    drwxr-xr-x.   2 root root  4096 Sep 23  2011 etc
    drwxr-xr-x.   2 root root  4096 Sep 23  2011 games
    drwxr-xr-x.  39 root root  4096 Apr 15 15:44 include
    dr-xr-xr-x.  29 root root  4096 Apr 22 03:18 lib
    dr-xr-xr-x. 132 root root 86016 Apr 29 03:32 lib64
    drwxr-xr-x.  30 root root 12288 Apr 29 03:32 libexec
    drwxr-xr-x.  15 root root  4096 Jun  5 19:57 local
    drwxr-xr-x    3 root root  4096 Apr 21 20:38 man
    dr-xr-xr-x.   2 root root 12288 Jul 30 03:42 sbin
    drwxr-xr-x. 265 root root 12288 Jun  9 09:34 share
    drwxr-xr-x.   4 root root  4096 Jul  6  2012 src
    lrwxrwxrwx.   1 root root    10 Jul  6  2012 tmp -> ../var/tmp
    [lingyun@localhost getcwd]$ ls /usr/tmp/yum-lingyun-sYjnfB/
    [lingyun@localhost getcwd]$ gcc getcwd.c 
    [lingyun@localhost getcwd]$ ./a.out 
    cwd = /var/tmp/yum-lingyun-sYjnfB
    [lingyun@localhost getcwd]$

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  • 原文地址:https://www.cnblogs.com/riskyer/p/3241486.html
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