trawick 02/04/04 13:25:05
Modified: . configure.in
Log:
fix some typos in existing posixsem logic
make sure sem_open actually works before deciding that
we can use it; some popular levels of Linux have a stub
sem_open that returns ENOSYS
Revision Changes Path
1.424 +25 -3 apr/configure.in
Index: configure.in
===================================================================
RCS file: /home/cvs/apr/configure.in,v
retrieving revision 1.423
retrieving revision 1.424
diff -u -r1.423 -r1.424
--- configure.in 4 Apr 2002 18:33:56 -0000 1.423
+++ configure.in 4 Apr 2002 21:25:05 -0000 1.424
@@ -1241,7 +1241,29 @@
AC_CHECK_FUNCS(semget semctl flock)
APR_CHECK_FILE(/dev/zero)
AC_CHECK_HEADERS(semaphore.h)
-AC_CHECK_FUNCS(sem_open sem_close sem_unlink sem_post sem_wait)
+AC_CHECK_FUNCS(sem_close sem_unlink sem_post sem_wait)
+
+dnl Some systems return ENOSYS from sem_open.
+AC_CACHE_CHECK(for working sem_open,ac_cv_func_sem_open,[
+AC_TRY_RUN([
+#include <errno.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <semaphore.h>
+main()
+{
+ sem_t *psem;
+ const char *sem_name = "/apr_autoconf";
+
+ psem = sem_open(sem_name, O_CREAT, 0644, 1);
+ if (psem == (sem_t *)SEM_FAILED) {
+ exit(1);
+ }
+ sem_close(psem);
+ sem_unlink(sem_name);
+ exit(0);
+}], [ac_cv_func_sem_open=yes], [ac_cv_func_sem_open=no],
+[ac_cv_func_sem_open=no])])
# It's stupid, but not all platforms have union semun, even those that need
it.
AC_MSG_CHECKING(for union semun in sys/sem.h)
@@ -1328,8 +1350,8 @@
fi
# See which lock mechanisms we can support on this system.
-APR_IFALLYES(header:semaphore.h func:sem_open func_sem_close dnl
- func_sem_unlink func:sem_post func_sem_wait,
+APR_IFALLYES(header:semaphore.h func:sem_open func:sem_close dnl
+ func_sem_unlink func:sem_post func:sem_wait,
hasposixser="1", hasposixser="0")
APR_IFALLYES(func:semget func:semctl define:SEM_UNDO, hassysvser="1",
hassysvser="0")
