Linux下system和exec函数族的区别_system exec族函数的区别-优快云博客

本文链接：https://blog.youkuaiyun.com/koozxcv/article/details/49743869

本文详细介绍了Linux系统中system和exec函数族的区别。system通过shell执行命令并在完成后返回原程序，而exec则直接替换当前进程，使程序变为被调用的程序。在使用上，exec常与fork结合使用。通过示例代码展示了两者的不同行为，如system会在命令执行后继续执行后续代码，而exec则不会。

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分别man system和 execl得到

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NAME

system - execute a shell command

SYNOPSIS
#include <stdlib.h>

int system(const char *command);

DESCRIPTION
system() executes a command specified in command by calling /bin/sh -c
command, and returns after the command has been completed. During exe‐
cution of the command, SIGCHLD will be blocked, and SIGINT and SIGQUIT
will be ignored.

RETURN VALUE
The value returned is -1 on error (e.g. fork(2) failed), and the
return status of the command otherwise. This latter return status is
in the format specified in wait(2). Thus, the exit code of the command

will be WEXITSTATUS(status). In case /bin/sh could not be executed,

the exit status will be that of a command that does exit(127).
If the value of command is NULL, system() returns nonzero if the shell
is available, and zero if not.
system() does not affect the wait status of any other children.

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NAME
execl, execlp, execle, execv, execvp, execvpe - execute a file

SYNOPSIS