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glibc  2.9
tst-sem1.c
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00001 /* Copyright (C) 2002 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <errno.h>
00021 #include <semaphore.h>
00022 #include <stdio.h>
00023 #include <unistd.h>
00024 
00025 
00026 static int
00027 do_test (void)
00028 {
00029   sem_t s;
00030 
00031   if (sem_init (&s, 0, 1) == -1)
00032     {
00033       puts ("init failed");
00034       return 1;
00035     }
00036 
00037   if (TEMP_FAILURE_RETRY (sem_wait (&s)) == -1)
00038     {
00039       puts ("1st wait failed");
00040       return 1;
00041     }
00042 
00043   if (sem_post (&s) == -1)
00044     {
00045       puts ("1st post failed");
00046       return 1;
00047     }
00048 
00049   if (TEMP_FAILURE_RETRY (sem_trywait (&s)) == -1)
00050     {
00051       puts ("1st trywait failed");
00052       return 1;
00053     }
00054 
00055   errno = 0;
00056   if (TEMP_FAILURE_RETRY (sem_trywait (&s)) != -1)
00057     {
00058       puts ("2nd trywait succeeded");
00059       return 1;
00060     }
00061   else if (errno != EAGAIN)
00062     {
00063       puts ("2nd trywait did not set errno to EAGAIN");
00064       return 1;
00065     }
00066 
00067   if (sem_post (&s) == -1)
00068     {
00069       puts ("2nd post failed");
00070       return 1;
00071     }
00072 
00073   if (TEMP_FAILURE_RETRY (sem_wait (&s)) == -1)
00074     {
00075       puts ("2nd wait failed");
00076       return 1;
00077     }
00078 
00079   if (sem_destroy (&s) == -1)
00080     {
00081       puts ("destroy failed");
00082       return 1;
00083     }
00084 
00085   return 0;
00086 }
00087 
00088 #define TEST_FUNCTION do_test ()
00089 #include "../test-skeleton.c"