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From: tw@foobar.UUCP (Tom Walsh)
Newsgroups: comp.unix.wizards
Subject: shell stderr in popen()
Message-ID: <124@foobar.UUCP>
Date: Mon, 3-Aug-87 21:05:37 EDT
Article-I.D.: foobar.124
Posted: Mon Aug  3 21:05:37 1987
Date-Received: Sat, 8-Aug-87 11:19:30 EDT
Sender: news@foobar.UUCP
Distribution: na
Organization: - Intel Corp - Hawthorne Farms - Hillsboro, OR -
Lines: 33
Keywords: shell popen stderr redirection


  hi, sortof like the scanf() contest...
  i have a need to use popen(command, "r").  if command is not
  found, i would like to dispose quietly of the shell's complaint:
  sh: command: not found
  the stderr of the command itself can be handled ala:
  popen("/usr/bin/mynewcommand -flags 2> /dev/null", "r");
  but if "mynewcommand" isn't around, the shell's stderr still
  gets put on the *real* stderr.

  question:
   is there an easier way than:
    .
    .
    .
    realerr = dup(stderr);
    freopen("/dev/null", "w", stderr);
    popen();
    do_stuff();
    pclose();
    fclose(stderr);
    dup2(realerr, stderr);
    .
    .
    .
  to get rid of the shell's stderr????

-tw (Tom Walsh, (503)696-7105, Intel Corp; Hillsboro OR)
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