本文主要是介绍linux下的四个简单函数介绍:getpid, getppid, getuid, getgid，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
直接看程序：
#include <stdio.h>int main()
{printf("pid:%d, ppid:%d, uid:%d, gid:%d\n", getpid(), getppid(), getuid(), getgid());return 0;
}[taoge@localhost learn_c]$ echo $$
2774
[taoge@localhost learn_c]$ id
uid=501(taoge) gid=502(taoge) groups=502(taoge),501(embed)
[taoge@localhost learn_c]$ ./a.out
pid:2898, ppid:2774, uid:501, gid:502
2774
[taoge@localhost learn_c]$ id
uid=501(taoge) gid=502(taoge) groups=502(taoge),501(embed)
[taoge@localhost learn_c]$ ./a.out
pid:2898, ppid:2774, uid:501, gid:502
[taoge@localhost learn_c]$ su root
Password:
[root@localhost learn_c]# echo &&
>
> ^C
[root@localhost learn_c]# id
uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel)
[root@localhost learn_c]# ./a.out
pid:2922, ppid:2905, uid:0, gid:0
[root@localhost learn_c]# su taoge
[taoge@localhost learn_c]$ echo $$
2928
[taoge@localhost learn_c]$ id
uid=501(taoge) gid=502(taoge) groups=502(taoge),501(embed)
[taoge@localhost learn_c]$ ./a.out
pid:2946, ppid:2928, uid:501, gid:502
[taoge@localhost learn_c]$
ok, 无需多说。
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