Adding upstream version 9.1.upstream/9.1upstream

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

1 files changed, 221 insertions, 0 deletions

diff --git a/src/nice.c b/src/nice.c
new file mode 100644
index 0000000..55aa95a
--- /dev/null
+++ b/src/nice.c
@@ -0,0 +1,221 @@
+/* nice -- run a program with modified niceness
+   Copyright (C) 1990-2022 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/>.  */
+
+/* David MacKenzie <djm@gnu.ai.mit.edu> */
+
+#include <config.h>
+#include <stdio.h>
+#include <getopt.h>
+#include <sys/types.h>
+
+#include "system.h"
+
+#if ! HAVE_NICE
+/* Include this after "system.h" so we're sure to have definitions
+   (from time.h or sys/time.h) required for e.g. the ru_utime member.  */
+# include <sys/resource.h>
+#endif
+
+#include "die.h"
+#include "error.h"
+#include "quote.h"
+#include "xstrtol.h"
+
+/* The official name of this program (e.g., no 'g' prefix).  */
+#define PROGRAM_NAME "nice"
+
+#define AUTHORS proper_name ("David MacKenzie")
+
+#if HAVE_NICE
+# define GET_NICENESS() nice (0)
+#else
+# define GET_NICENESS() getpriority (PRIO_PROCESS, 0)
+#endif
+
+#ifndef NZERO
+# define NZERO 20
+#endif
+
+/* This is required for Darwin Kernel Version 7.7.0.  */
+#if NZERO == 0
+# undef  NZERO
+# define NZERO 20
+#endif
+
+static struct option const longopts[] =
+{
+  {"adjustment", required_argument, NULL, 'n'},
+  {GETOPT_HELP_OPTION_DECL},
+  {GETOPT_VERSION_OPTION_DECL},
+  {NULL, 0, NULL, 0}
+};
+
+void
+usage (int status)
+{
+  if (status != EXIT_SUCCESS)
+    emit_try_help ();
+  else
+    {
+      printf (_("Usage: %s [OPTION] [COMMAND [ARG]...]\n"), program_name);
+      printf (_("\
+Run COMMAND with an adjusted niceness, which affects process scheduling.\n\
+With no COMMAND, print the current niceness.  Niceness values range from\n\
+%d (most favorable to the process) to %d (least favorable to the process).\n\
+"),
+              - NZERO, NZERO - 1);
+
+      emit_mandatory_arg_note ();
+
+      fputs (_("\
+  -n, --adjustment=N   add integer N to the niceness (default 10)\n\
+"), stdout);
+      fputs (HELP_OPTION_DESCRIPTION, stdout);
+      fputs (VERSION_OPTION_DESCRIPTION, stdout);
+      printf (USAGE_BUILTIN_WARNING, PROGRAM_NAME);
+      emit_ancillary_info (PROGRAM_NAME);
+    }
+  exit (status);
+}
+
+static bool
+perm_related_errno (int err)
+{
+  return err == EACCES || err == EPERM;
+}
+
+int
+main (int argc, char **argv)
+{
+  int current_niceness;
+  int adjustment = 10;
+  char const *adjustment_given = NULL;
+  bool ok;
+  int i;
+
+  initialize_main (&argc, &argv);
+  set_program_name (argv[0]);
+  setlocale (LC_ALL, "");
+  bindtextdomain (PACKAGE, LOCALEDIR);
+  textdomain (PACKAGE);
+
+  initialize_exit_failure (EXIT_CANCELED);
+  atexit (close_stdout);
+
+  for (i = 1; i < argc; /* empty */)
+    {
+      char const *s = argv[i];
+
+      if (s[0] == '-' && ISDIGIT (s[1 + (s[1] == '-' || s[1] == '+')]))
+        {
+          adjustment_given = s + 1;
+          ++i;
+        }
+      else
+        {
+          int c;
+          int fake_argc = argc - (i - 1);
+          char **fake_argv = argv + (i - 1);
+
+          /* Ensure that any getopt diagnostics use the right name.  */
+          fake_argv[0] = argv[0];
+
+          /* Initialize getopt_long's internal state.  */
+          optind = 0;
+
+          c = getopt_long (fake_argc, fake_argv, "+n:", longopts, NULL);
+          i += optind - 1;
+
+          switch (c)
+            {
+            case 'n':
+              adjustment_given = optarg;
+              break;
+
+            case -1:
+              break;
+
+            case_GETOPT_HELP_CHAR;
+
+            case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
+
+            default:
+              usage (EXIT_CANCELED);
+              break;
+            }
+
+          if (c == -1)
+            break;
+        }
+    }
+
+  if (adjustment_given)
+    {
+      /* If the requested adjustment is outside the valid range,
+         silently bring it to just within range; this mimics what
+         "setpriority" and "nice" do.  */
+      enum { MIN_ADJUSTMENT = 1 - 2 * NZERO, MAX_ADJUSTMENT = 2 * NZERO - 1 };
+      long int tmp;
+      if (LONGINT_OVERFLOW < xstrtol (adjustment_given, NULL, 10, &tmp, ""))
+        die (EXIT_CANCELED, 0, _("invalid adjustment %s"),
+             quote (adjustment_given));
+      adjustment = MAX (MIN_ADJUSTMENT, MIN (tmp, MAX_ADJUSTMENT));
+    }
+
+  if (i == argc)
+    {
+      if (adjustment_given)
+        {
+          error (0, 0, _("a command must be given with an adjustment"));
+          usage (EXIT_CANCELED);
+        }
+      /* No command given; print the niceness.  */
+      errno = 0;
+      current_niceness = GET_NICENESS ();
+      if (current_niceness == -1 && errno != 0)
+        die (EXIT_CANCELED, errno, _("cannot get niceness"));
+      printf ("%d\n", current_niceness);
+      return EXIT_SUCCESS;
+    }
+
+  errno = 0;
+#if HAVE_NICE
+  ok = (nice (adjustment) != -1 || errno == 0);
+#else
+  current_niceness = GET_NICENESS ();
+  if (current_niceness == -1 && errno != 0)
+    die (EXIT_CANCELED, errno, _("cannot get niceness"));
+  ok = (setpriority (PRIO_PROCESS, 0, current_niceness + adjustment) == 0);
+#endif
+  if (!ok)
+    {
+      error (perm_related_errno (errno) ? 0
+             : EXIT_CANCELED, errno, _("cannot set niceness"));
+      /* 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.  */
+      if (ferror (stderr))
+        return EXIT_CANCELED;
+    }
+
+  execvp (argv[i], &argv[i]);
+
+  int exit_status = errno == ENOENT ? EXIT_ENOENT : EXIT_CANNOT_INVOKE;
+  error (0, errno, "%s", quote (argv[i]));
+  return exit_status;
+}