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From: pacman@kosh.dhis.org (Alan Curry)
Newsgroups: comp.os.linux.development.apps,comp.os.linux.development.system
Subject: Re: Status = 2943 from waitpid?
Date: Thu, 9 Jun 2011 06:03:18 +0000 (UTC)
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In article <033817d4-c109-4d37-a476-f7710b7ed829@a10g2000vbz.googlegroups.com>,
Jeffrey Walton  <noloader@gmail.com> wrote:
>Hi All,
>
>I'm ptrace'ing a process. After fork/exec and then a wait on the
>child, I'm getting a status of 2943. I'm testing for failure, but
>waitpid reports non-failure. I've looked in <sys/wait.h>, but the
>value 2943 is not defined and does not appear to be a bit mask.

Don't try to pick apart the bits by hand and especially don't try to treat
the glibc header files as human-readable. <sys/wait.h> provides macros that
you can use in C code to determine what an exit status means. So write the C
code. Trying to parse <sys/wait.h> with your pathetic human brain will lead
to frustration.

#include <stdio.h>
#include <string.h>
#include <sys/wait.h>

int main(void)
{
  int status = 2943;

  if(WIFEXITED(status)) {
    printf("Exit status %d\n", WEXITSTATUS(status));
  } else if(WIFSIGNALED(status)) {
    printf("Terminated by signal %d (%s)%s\n",
           WTERMSIG(status),
           strsignal(WTERMSIG(status)),
           WCOREDUMP(status)?" (core dumped)":"");
  } else if(WIFSTOPPED(status)) {
    printf("Stopped by signal %d (%s)\n",
           WSTOPSIG(status),
           strsignal(WSTOPSIG(status)));
  } else if(WIFCONTINUED(status)) {
    printf("Continued\n");
  }
}

-- 
Alan Curry