nptl/tst-cancel7.c

   1 /* Copyright (C) 2002-2013 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Jakub Jelinek <jakub@redhat.com>, 2002.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <fcntl.h>
  21 #include <pthread.h>
  22 #include <signal.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <unistd.h>
  27
  28 const char *command;
  29 const char *pidfile;
  30 char pidfilename[] = "/tmp/tst-cancel7-XXXXXX";
  31
  32 static void *
  33 tf (void *arg)
  34 {
  35   const char *args = " --direct --pidfile ";
  36   char *cmd = alloca (strlen (command) + strlen (args)
  37                       + strlen (pidfilename) + 1);
  38
  39   strcpy (stpcpy (stpcpy (cmd, command), args), pidfilename);
  40   system (cmd);
  41   /* This call should never return.  */
  42   return NULL;
  43 }
  44
  45
  46 static void
  47 sl (void)
  48 {
  49   FILE *f = fopen (pidfile, "w");
  50   if (f == NULL)
  51     exit (1);
  52
  53   fprintf (f, "%lld\n", (long long) getpid ());
  54   fflush (f);
  55
  56   struct flock fl =
  57     {
  58       .l_type = F_WRLCK,
  59       .l_start = 0,
  60       .l_whence = SEEK_SET,
  61       .l_len = 1
  62     };
  63   if (fcntl (fileno (f), F_SETLK, &fl) != 0)
  64     exit (1);
  65
  66   sigset_t ss;
  67   sigfillset (&ss);
  68   sigsuspend (&ss);
  69   exit (0);
  70 }
  71
  72
  73 static void
  74 do_prepare (int argc, char *argv[])
  75 {
  76   if (command == NULL)
  77     command = argv[0];
  78
  79   if (pidfile)
  80     sl ();
  81
  82   int fd = mkstemp (pidfilename);
  83   if (fd == -1)
  84     {
  85       puts ("mkstemp failed");
  86       exit (1);
  87     }
  88
  89   write (fd, " ", 1);
  90   close (fd);
  91 }
  92
  93
  94 static int
  95 do_test (void)
  96 {
  97   pthread_t th;
  98   if (pthread_create (&th, NULL, tf, NULL) != 0)
  99     {
 100       puts ("pthread_create failed");
 101       return 1;
 102     }
 103
 104   do
 105     sleep (1);
 106   while (access (pidfilename, R_OK) != 0);
 107
 108   if (pthread_cancel (th) != 0)
 109     {
 110       puts ("pthread_cancel failed");
 111       return 1;
 112     }
 113
 114   void *r;
 115   if (pthread_join (th, &r) != 0)
 116     {
 117       puts ("pthread_join failed");
 118       return 1;
 119     }
 120
 121   sleep (1);
 122
 123   FILE *f = fopen (pidfilename, "r+");
 124   if (f == NULL)
 125     {
 126       puts ("no pidfile");
 127       return 1;
 128     }
 129
 130   long long ll;
 131   if (fscanf (f, "%lld\n", &ll) != 1)
 132     {
 133       puts ("could not read pid");
 134       unlink (pidfilename);
 135       return 1;
 136     }
 137
 138   struct flock fl =
 139     {
 140       .l_type = F_WRLCK,
 141       .l_start = 0,
 142       .l_whence = SEEK_SET,
 143       .l_len = 1
 144     };
 145   if (fcntl (fileno (f), F_GETLK, &fl) != 0)
 146     {
 147       puts ("F_GETLK failed");
 148       unlink (pidfilename);
 149       return 1;
 150     }
 151
 152   if (fl.l_type != F_UNLCK)
 153     {
 154       printf ("child %lld still running\n", (long long) fl.l_pid);
 155       if (fl.l_pid == ll)
 156         kill (fl.l_pid, SIGKILL);
 157
 158       unlink (pidfilename);
 159       return 1;
 160     }
 161
 162   fclose (f);
 163
 164   unlink (pidfilename);
 165
 166   return r != PTHREAD_CANCELED;
 167 }
 168
 169 static void
 170 do_cleanup (void)
 171 {
 172   FILE *f = fopen (pidfilename, "r+");
 173   long long ll;
 174
 175   if (f != NULL && fscanf (f, "%lld\n", &ll) == 1)
 176     {
 177       struct flock fl =
 178         {
 179           .l_type = F_WRLCK,
 180           .l_start = 0,
 181           .l_whence = SEEK_SET,
 182           .l_len = 1
 183         };
 184       if (fcntl (fileno (f), F_GETLK, &fl) == 0 && fl.l_type != F_UNLCK
 185           && fl.l_pid == ll)
 186         kill (fl.l_pid, SIGKILL);
 187
 188       fclose (f);
 189     }
 190
 191   unlink (pidfilename);
 192 }
 193
 194 #define OPT_COMMAND     10000
 195 #define OPT_PIDFILE     10001
 196 #define CMDLINE_OPTIONS \
 197   { "command", required_argument, NULL, OPT_COMMAND },  \
 198   { "pidfile", required_argument, NULL, OPT_PIDFILE },
 199 #define CMDLINE_PROCESS \
 200   case OPT_COMMAND:     \
 201     command = optarg;   \
 202     break;              \
 203   case OPT_PIDFILE:     \
 204     pidfile = optarg;   \
 205     break;
 206 #define CLEANUP_HANDLER do_cleanup ()
 207 #define PREPARE(argc, argv) do_prepare (argc, argv)
 208 #define TEST_FUNCTION do_test ()
 209 #define TIMEOUT 5
 210 #include "../test-skeleton.c"