请问C里面有没有跟system函数差不多的函数

system 本身就可以返回调用的程序的返回值啊

RETURN VALUE
The value returned is -1 on error (e.g. fork() 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 non-zero if the shell is available, and zero if not.

system() does not affect the wait status of any other children.