pidfile.c

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/* SPDX-FileCopyrightText: 2009-2023 Greenbone AG
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */
 
#include "pidfile.h"
 
#include <errno.h>       /* for errno */
#include <glib.h>        /* for g_free, gchar */
#include <glib/gstdio.h> /* for g_unlink, g_fopen */
#include <libgen.h>      /* for libgen */
#include <stdio.h>       /* for fclose, FILE */
#include <stdlib.h>      /* for atoi */
#include <string.h>      /* for strerror */
#include <unistd.h>      /* for getpid */
 
#undef G_LOG_DOMAIN
 
#define G_LOG_DOMAIN "libgvm base"
 
int
pidfile_create (gchar *pid_file_path)
{
  FILE *pidfile;
  gchar *copy, *dir;
 
  if (pid_file_path == NULL)
    return -1;
 
  copy = g_strdup (pid_file_path);
  dir = dirname (copy);
 
  /* Ensure directory exists. */
 
  if (g_mkdir_with_parents (dir, 0755)) /* "rwxr-xr-x" */
    {
      g_free (copy);
      g_warning ("Failed to create PID file directory %s: %s", dir,
                 strerror (errno));
      return 1;
    }
  g_free (copy);
 
  /* Create file. */
 
  pidfile = g_fopen (pid_file_path, "w");
 
  if (pidfile == NULL)
    {
      g_critical ("%s: failed to open pidfile %s: %s\n", __func__,
                  pid_file_path, strerror (errno));
      return 1;
    }
  else
    {
      g_fprintf (pidfile, "%d\n", getpid ());
      fclose (pidfile);
    }
  return 0;
}
 
void
pidfile_remove (gchar *pid_file_path)
{
  gchar *pidfile_contents;
 
  if (g_file_get_contents (pid_file_path, &pidfile_contents, NULL, NULL))
    {
      int pid = atoi (pidfile_contents);
 
      if (pid == getpid ())
        {
          g_unlink (pid_file_path);
        }
      g_free (pidfile_contents);
    }
}