#include dio.h>
int
main(int argc,char *argv[])
{
int a = system("./test12.out"); //here if i give any wrong command
system("echo $?")
printf("system return is %d",a);
}
sh: ./test12.out: No such file or directory
0
system return is 32512
这是我的shell命令失败但我怎么知道我的c代码？
编辑：
那么,我可以这样做吗？
int main(int argc,char *argv[])
{
int a = system("dftg");
if(a == -1)
printf("some error has occured in that shell command");
else if (WEXITSTATUS(a) == 127)
printf("That shell command is not found");
else
printf("system call return succesfull with %d",WEXITSTATUS(a));
}
最佳答案
如果a == -1,则呼叫失败.否则,退出代码为WEXITSTATUS(a).
原文链接：https://www.f2er.com/linux/440733.html引用man 3系统：
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 non-zero if the shell
is available,and zero if not.
