拥有std = c99时如何使用exec / kill？

Question

When I try to use exec:

#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <stdlib.h>


int main()
{
    exec("echo `Hello World`");
    return 0;
}

I get this error:

code.c:11: error: implicit declaration of function ‘exec’
make: *** [code.o] Error 1

I have to use std=c99 and I can't add any other compiler flags. How can I use exec (or a simmilar call)?

I guess the solution will be the same for kill, wouldn't it?

Answer 1

Based on your includes, it appears like you're using a Unix of some kind. There is no exec call. There is execl , exexlp , and others with names depending on the exact types of parameters. Check the man page for 'exec' for details.

Answer 2

您需要#define _POSIX_C_SOURCE 200809L或#define _XOPEN_SOURCE 700 ，或在编译器的命令行上使用等效的-D选项。