nptl/tst-cancel7.c

   1 /* Copyright (C) 2002-2021 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    <https://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 #include <getopt.h>
  28
  29 #include <support/xthread.h>
  30
  31 const char *command;
  32 const char *pidfile;
  33 char pidfilename[] = "/tmp/tst-cancel7-XXXXXX";
  34
  35 static void *
  36 tf (void *arg)
  37 {
  38   const char *args = " --direct --pidfile ";
  39   char *cmd = alloca (strlen (command) + strlen (args)
  40                       + strlen (pidfilename) + 1);
  41
  42   strcpy (stpcpy (stpcpy (cmd, command), args), pidfilename);
  43   system (cmd);
  44   /* This call should never return.  */
  45   return NULL;
  46 }
  47
  48
  49 static void
  50 sl (void)
  51 {
  52   FILE *f = fopen (pidfile, "w");
  53   if (f == NULL)
  54     exit (1);
  55
  56   fprintf (f, "%lld\n", (long long) getpid ());
  57   fflush (f);
  58
  59   struct flock fl =
  60     {
  61       .l_type = F_WRLCK,
  62       .l_start = 0,
  63       .l_whence = SEEK_SET,
  64       .l_len = 1
  65     };
  66   if (fcntl (fileno (f), F_SETLK, &fl) != 0)
  67     exit (1);
  68
  69   sigset_t ss;
  70   sigfillset (&ss);
  71   sigsuspend (&ss);
  72   exit (0);
  73 }
  74
  75
  76 static void
  77 do_prepare (int argc, char *argv[])
  78 {
  79   if (command == NULL)
  80     command = argv[0];
  81
  82   if (pidfile)
  83     sl ();
  84
  85   int fd = mkstemp (pidfilename);
  86   if (fd == -1)
  87     {
  88       puts ("mkstemp failed");
  89       exit (1);
  90     }
  91
  92   write (fd, " ", 1);
  93   close (fd);
  94 }
  95
  96
  97 static int
  98 do_test (void)
  99 {
 100   pthread_t th;
 101   if (pthread_create (&th, NULL, tf, NULL) != 0)
 102     {
 103       puts ("pthread_create failed");
 104       return 1;
 105     }
 106
 107   do
 108     sleep (1);
 109   while (access (pidfilename, R_OK) != 0);
 110
 111   xpthread_cancel (th);
 112   void *r = xpthread_join (th);
 113
 114   sleep (1);
 115
 116   FILE *f = fopen (pidfilename, "r+");
 117   if (f == NULL)
 118     {
 119       puts ("no pidfile");
 120       return 1;
 121     }
 122
 123   long long ll;
 124   if (fscanf (f, "%lld\n", &ll) != 1)
 125     {
 126       puts ("could not read pid");
 127       unlink (pidfilename);
 128       return 1;
 129     }
 130
 131   struct flock fl =
 132     {
 133       .l_type = F_WRLCK,
 134       .l_start = 0,
 135       .l_whence = SEEK_SET,
 136       .l_len = 1
 137     };
 138   if (fcntl (fileno (f), F_GETLK, &fl) != 0)
 139     {
 140       puts ("F_GETLK failed");
 141       unlink (pidfilename);
 142       return 1;
 143     }
 144
 145   if (fl.l_type != F_UNLCK)
 146     {
 147       printf ("child %lld still running\n", (long long) fl.l_pid);
 148       if (fl.l_pid == ll)
 149         kill (fl.l_pid, SIGKILL);
 150
 151       unlink (pidfilename);
 152       return 1;
 153     }
 154
 155   fclose (f);
 156
 157   unlink (pidfilename);
 158
 159   return r != PTHREAD_CANCELED;
 160 }
 161
 162 static void
 163 do_cleanup (void)
 164 {
 165   FILE *f = fopen (pidfilename, "r+");
 166   long long ll;
 167
 168   if (f != NULL && fscanf (f, "%lld\n", &ll) == 1)
 169     {
 170       struct flock fl =
 171         {
 172           .l_type = F_WRLCK,
 173           .l_start = 0,
 174           .l_whence = SEEK_SET,
 175           .l_len = 1
 176         };
 177       if (fcntl (fileno (f), F_GETLK, &fl) == 0 && fl.l_type != F_UNLCK
 178           && fl.l_pid == ll)
 179         kill (fl.l_pid, SIGKILL);
 180
 181       fclose (f);
 182     }
 183
 184   unlink (pidfilename);
 185 }
 186
 187 #define OPT_COMMAND     10000
 188 #define OPT_PIDFILE     10001
 189 #define CMDLINE_OPTIONS \
 190   { "command", required_argument, NULL, OPT_COMMAND },  \
 191   { "pidfile", required_argument, NULL, OPT_PIDFILE },
 192 static void
 193 cmdline_process (int c)
 194 {
 195   switch (c)
 196     {
 197     case OPT_COMMAND:
 198       command = optarg;
 199       break;
 200     case OPT_PIDFILE:
 201       pidfile = optarg;
 202       break;
 203     }
 204 }
 205 #define CMDLINE_PROCESS cmdline_process
 206 #define CLEANUP_HANDLER do_cleanup
 207 #define PREPARE do_prepare
 208 #include <support/test-driver.c>