Question

I have the following code.

My question is in the code

     int main() {

            ....

         if ((uproc.pid = fork()) == -1) {
            return -1;
        }

        if (uproc.pid == 0) {
            /* child */

            const char *argv[3];
            int i = 0;
            argv[i++] = "/bin/sh";
            argv[i++] =  "/my/script.sh";
            argv[i++] = NULL;

            execvp(argv[0], (char **) argv);
            exit(ESRCH);

        } else if (uproc.pid < 0)
            return -1;

        /* parent */
        int status;
        while (wait(&status) != uproc.pid) {
            DD(DEBUG,"waiting for child to exit");
        }

           // If /my/script.sh exit accidentally in some place with error. 
           // can I catch this error right here?
          ......
    }

Answer 1

The exit status of the child is provided by the wait function, in the status variable.

You get the exit status by using the WEXITSTATUS macro, but only if the program exited normally (i.e. called exit or returned from its main function):

if (WIFEXITED(status))
    printf("Child exit status: %d\n", WEXITSTATUS(status));
else
    printf("Child exited abnormally\n");

Read the manual page for wait for more information.