[cs631apue] how execlp works?

[Runxi Ding]

I read source code of the simple_shell.c and found the following code:

              /* child */
              execlp(buf, buf, (char *)0);
              fprintf(stderr, "shell: couldn't exec %s: %s\n", buf,
                      strerror(errno));
              exit(EX_DATAERR);


*Shouldn't the program print error every time? * The fact is that codes
under execlp never get executed if execlp works properly.
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