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nohup output file

From: Noah Heusser
Subject: nohup output file
Date: Fri, 27 Apr 2007 14:55:42 +0200
User-agent: Thunderbird (X11/20070103)


I wantet nohup to write in a /var/../logfile. So I addet a Parameter to
specify a File in witch the output is forwardet.

The original nohup.c File was taken form the coreutils-6.9. The modifyed
is attatched.
Sorry, i have no idea how to create a pach file.

Maybe sombody is interested in it.

/* nohup -- run a command immune to hangups, with output to a non-tty
   Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software Foundation,
   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */

/* Written by Jim Meyering  */

#include <config.h>
#include <getopt.h>
#include <stdio.h>
#include <sys/types.h>
#include <signal.h>

#include "system.h"

#include "cloexec.h"
#include "error.h"
#include "filenamecat.h"
#include "fd-reopen.h"
#include "long-options.h"
#include "quote.h"
#include "unistd--.h"

#define PROGRAM_NAME "nohup"

#define AUTHORS "Jim Meyering"

/* Exit statuses.  */
    /* `nohup' itself failed.  */

static struct option const long_options[] =
    {"out-file", optional_argument, NULL, 'f'},
    {NULL, 0, NULL, 0}

char *program_name;

usage (int status)
  if (status != EXIT_SUCCESS)
    fprintf (stderr, _("Try `%s --help' for more information.\n"),
      printf (_("\
Usage: %s COMMAND [ARG]...\n\
  or:  %s OPTION\n\
              program_name, program_name);

      fputs (_("\
Run COMMAND, ignoring hangup signals.\n\
"), stdout);
      fputs (HELP_OPTION_DESCRIPTION, stdout);
      fputs (VERSION_OPTION_DESCRIPTION, stdout);
      printf("      --out-file The File, the output of the Program should be 
written to.\n");
      printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
  exit (status);

main (int argc, char **argv)
  int c = 0;
  int out_fd = STDOUT_FILENO;
  int saved_stderr_fd = STDERR_FILENO;
  bool ignoring_input;
  bool redirecting_stdout;
  bool stdout_is_closed;
  bool redirecting_stderr;
  char *file = "nohup.out";

  initialize_main (&argc, &argv);
  program_name = argv[0];
  setlocale (LC_ALL, "");
  bindtextdomain (PACKAGE, LOCALEDIR);
  textdomain (PACKAGE);

  initialize_exit_failure (NOHUP_FAILURE);
  atexit (close_stdout);

  // parse_long_options (argc, argv, PROGRAM_NAME, GNU_PACKAGE, VERSION,
  //                  usage, AUTHORS, (char const *) NULL);
  while((c = getopt_long (argc, argv, "f:", long_options, NULL)) != -1)
      case 'f':
        file = strdup(optarg);


  if (argc <= optind)
      error (0, 0, _("missing operand"));
      usage (NOHUP_FAILURE);

  ignoring_input = isatty (STDIN_FILENO);
  redirecting_stdout = isatty (STDOUT_FILENO);
  stdout_is_closed = (!redirecting_stdout && errno == EBADF);
  redirecting_stderr = isatty (STDERR_FILENO);

  /* If standard input is a tty, replace it with /dev/null if possible.
     Note that it is deliberately opened for *writing*,
     to ensure any read evokes an error.  */
  if (ignoring_input)
      fd_reopen (STDIN_FILENO, "/dev/null", O_WRONLY, 0);
      if (!redirecting_stdout && !redirecting_stderr)
        error (0, 0, _("ignoring input"));

  /* If standard output is a tty, redirect it (appending) to a file.
     First try nohup.out, then $HOME/nohup.out.  If standard error is
     a tty and standard output is closed, open nohup.out or
     $HOME/nohup.out without redirecting anything.  */
  if (redirecting_stdout || (redirecting_stderr && stdout_is_closed))
      char *in_home = NULL;
      int flags = O_CREAT | O_WRONLY | O_APPEND;
      mode_t mode = S_IRUSR | S_IWUSR;
      mode_t umask_value = umask (~mode);
      out_fd = (redirecting_stdout
                ? fd_reopen (STDOUT_FILENO, file, flags, mode)
                : open (file, flags, mode));

      if (out_fd < 0)
          int saved_errno = errno;
          char const *home = getenv ("HOME");
          if (home)
              in_home = file_name_concat (home, file, NULL);
              out_fd = (redirecting_stdout
                        ? fd_reopen (STDOUT_FILENO, in_home, flags, mode)
                        : open (in_home, flags, mode));
          if (out_fd < 0)
              int saved_errno2 = errno;
              error (0, saved_errno, _("failed to open %s"), quote (file));
              if (in_home)
                error (0, saved_errno2, _("failed to open %s"),
                       quote (in_home));
              exit (NOHUP_FAILURE);
          file = in_home;

      umask (umask_value);
      error (0, 0,
               ? "ignoring input and appending output to %s"
               : "appending output to %s"),
             quote (file));
      free (in_home);

  /* If standard error is a tty, redirect it.  */
  if (redirecting_stderr)
      /* Save a copy of stderr before redirecting, so we can use the original
         if execve fails.  It's no big deal if this dup fails.  It might
         not change anything, and at worst, it'll lead to suppression of
         the post-failed-execve diagnostic.  */
      saved_stderr_fd = dup (STDERR_FILENO);

      if (0 <= saved_stderr_fd
          && set_cloexec_flag (saved_stderr_fd, true) != 0)
        error (NOHUP_FAILURE, errno,
               _("failed to set the copy of stderr to close on exec"));

      if (!redirecting_stdout)
        error (0, 0,
                 ? "ignoring input and redirecting stderr to stdout"
                 : "redirecting stderr to stdout"));

      if (dup2 (out_fd, STDERR_FILENO) < 0)
        error (NOHUP_FAILURE, errno, _("failed to redirect standard error"));

      if (stdout_is_closed)
        close (out_fd);

  signal (SIGHUP, SIG_IGN);

    int exit_status;
    int saved_errno;
    char **cmd = argv + optind;

    execvp (*cmd, cmd);
    exit_status = (errno == ENOENT ? EXIT_ENOENT : EXIT_CANNOT_INVOKE);
    saved_errno = errno;

    /* The execve failed.  Output a diagnostic to stderr only if:
       - stderr was initially redirected to a non-tty, or
       - stderr was initially directed to a tty, and we
         can dup2 it to point back to that same tty.
       In other words, output the diagnostic if possible, but only if
       it will go to the original stderr.  */
    if (dup2 (saved_stderr_fd, STDERR_FILENO) == STDERR_FILENO)
      error (0, saved_errno, _("cannot run command %s"), quote (*cmd));

    exit (exit_status);

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