用system函数，如何知道该函数执行成功了？__system_command_interpreter_the_returns_

当前位置: 技术问答>linux和unix

用system函数，如何知道该函数执行成功了？

来源: 互联网发布时间：2015-08-25

本文导语: 用system函数，如何知道该函数执行成功了？ | 补充一点，要用system 获得返回值，最好在调用的main()函数中加上返回值，比如：下面的程序名称为test.c int main() { if () { ......

用system函数，如何知道该函数执行成功了？

补充一点，要用system 获得返回值，
最好在调用的main()函数中加上返回值，

比如：下面的程序名称为test.c

int main()
{
   if ()
   {
      ...
      exit(-1);
    }
    else
    {
       ...
       exit(1);
     }
}

这样在system("test")时可以取得test的返回值
int flag;
flag =system("test");
if (flag==1) printf("success!n");
else if (flag==-1) printr("fail!n");

非也,system的返回值与main的返回值是两回事。只能得到成功或失败的信息

如果system返回不是-1的话表明执行成功
rc = system("...");
WEXITSTATUS(rc)可以取被执行程序的返回值，该值的有效范围为0-127，就是main函数return的值或是exit的值

int system( const char *command );

Return Value：If command is NULL and the command interpreter is found, the function returns a nonzero value. If the command interpreter is not found, it returns 0 and sets errno to ENOENT. If command is not NULL, system returns the value that is returned by the command interpreter. It returns the value 0 only if the command interpreter returns the value 0. A return value of – 1 indicates an error, and errno is set to one of the following values:

E2BIG

Argument list (which is system-dependent) is too big.

ENOENT

Command interpreter cannot be found.

ENOEXEC

Command-interpreter file has invalid format and is not executable.

ENOMEM

Not enough memory is available to execute command; or available memory has been corrupted; or invalid block exists, indicating that process making call was not allocated properly.

If system return 0 , then success

我做的代码里面，这样写的
int rc=0;
rc=system("testname")
if(rc==0)
cout