Adding upstream version 9.1.upstream/9.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 225 insertions, 0 deletions

diff --git a/src/nohup.c b/src/nohup.c
new file mode 100644
index 0000000..47d74dd
--- /dev/null
+++ b/src/nohup.c
@@ -0,0 +1,225 @@
+/* nohup -- run a command immune to hangups, with output to a non-tty
+   Copyright (C) 2003-2022 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 3 of the License, 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
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   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, see <https://www.gnu.org/licenses/>.  */
+
+/* Written by Jim Meyering  */
+
+#include <config.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <signal.h>
+
+#include "system.h"
+
+#include "error.h"
+#include "filenamecat.h"
+#include "fd-reopen.h"
+#include "long-options.h"
+#include "unistd--.h"
+
+#define PROGRAM_NAME "nohup"
+
+#define AUTHORS proper_name ("Jim Meyering")
+
+/* Exit statuses.  */
+enum
+  {
+    /* 'nohup' itself failed.  */
+    POSIX_NOHUP_FAILURE = 127
+  };
+
+void
+usage (int status)
+{
+  if (status != EXIT_SUCCESS)
+    emit_try_help ();
+  else
+    {
+      printf (_("\
+Usage: %s COMMAND [ARG]...\n\
+  or:  %s OPTION\n\
+"),
+              program_name, program_name);
+
+      fputs (_("\
+Run COMMAND, ignoring hangup signals.\n\
+\n\
+"), stdout);
+      fputs (HELP_OPTION_DESCRIPTION, stdout);
+      fputs (VERSION_OPTION_DESCRIPTION, stdout);
+      printf (_("\n\
+If standard input is a terminal, redirect it from an unreadable file.\n\
+If standard output is a terminal, append output to 'nohup.out' if possible,\n\
+'$HOME/nohup.out' otherwise.\n\
+If standard error is a terminal, redirect it to standard output.\n\
+To save output to FILE, use '%s COMMAND > FILE'.\n"),
+              program_name);
+      printf (USAGE_BUILTIN_WARNING, PROGRAM_NAME);
+      emit_ancillary_info (PROGRAM_NAME);
+    }
+  exit (status);
+}
+
+int
+main (int argc, char **argv)
+{
+  int out_fd = STDOUT_FILENO;
+  int saved_stderr_fd = STDERR_FILENO;
+  bool ignoring_input;
+  bool redirecting_stdout;
+  bool stdout_is_closed;
+  bool redirecting_stderr;
+  int exit_internal_failure;
+
+  initialize_main (&argc, &argv);
+  set_program_name (argv[0]);
+  setlocale (LC_ALL, "");
+  bindtextdomain (PACKAGE, LOCALEDIR);
+  textdomain (PACKAGE);
+
+  /* POSIX 2008 requires that internal failure give status 127; unlike
+     for env, exec, nice, time, and xargs where it requires internal
+     failure give something in the range 1-125.  For consistency with
+     other tools, fail with EXIT_CANCELED unless POSIXLY_CORRECT.  */
+  exit_internal_failure = (getenv ("POSIXLY_CORRECT")
+                           ? POSIX_NOHUP_FAILURE : EXIT_CANCELED);
+  initialize_exit_failure (exit_internal_failure);
+  atexit (close_stdout);
+
+  parse_gnu_standard_options_only (argc, argv, PROGRAM_NAME, PACKAGE_NAME,
+                                   Version, false, usage, AUTHORS,
+                                   (char const *) NULL);
+
+  if (argc <= optind)
+    {
+      error (0, 0, _("missing operand"));
+      usage (exit_internal_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)
+    {
+      if (fd_reopen (STDIN_FILENO, "/dev/null", O_WRONLY, 0) < 0)
+        error (exit_internal_failure, errno,
+               _("failed to render standard input unusable"));
+      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;
+      char const *file = "nohup.out";
+      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"), quoteaf (file));
+              if (in_home)
+                error (0, saved_errno2, _("failed to open %s"),
+                       quoteaf (in_home));
+              return exit_internal_failure;
+            }
+          file = in_home;
+        }
+
+      umask (umask_value);
+      error (0, 0,
+             _(ignoring_input
+               ? N_("ignoring input and appending output to %s")
+               : N_("appending output to %s")),
+             quoteaf (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 = fcntl (STDERR_FILENO, F_DUPFD_CLOEXEC,
+                               STDERR_FILENO + 1);
+
+      if (!redirecting_stdout)
+        error (0, 0,
+               _(ignoring_input
+                 ? N_("ignoring input and redirecting stderr to stdout")
+                 : N_("redirecting stderr to stdout")));
+
+      if (dup2 (out_fd, STDERR_FILENO) < 0)
+        error (exit_internal_failure, errno,
+               _("failed to redirect standard error"));
+
+      if (stdout_is_closed)
+        close (out_fd);
+    }
+
+  /* error() flushes stderr, but does not check for write failure.
+     Normally, we would catch this via our atexit() hook of
+     close_stdout, but execvp() gets in the way.  If stderr
+     encountered a write failure, there is no need to try calling
+     error() again, particularly since we may have just changed the
+     underlying fd out from under stderr.  */
+  if (ferror (stderr))
+    return exit_internal_failure;
+
+  signal (SIGHUP, SIG_IGN);
+
+  char **cmd = argv + optind;
+  execvp (*cmd, cmd);
+  int exit_status = errno == ENOENT ? EXIT_ENOENT : EXIT_CANNOT_INVOKE;
+  int 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, _("failed to run command %s"), quoteaf (*cmd));
+
+  return exit_status;
+}