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Add configure test to make sure fcntl(SETLK) is available, 

and make backend/libpq/pqcomm.c only try to lock the socket file when
the call exists.  Also, change open-RDONLY to open-WRONLY; at least
on my platform, you can't get a write lock on a file you didn't open
for writing.
This commit is contained in:
Tom Lane 1998-10-06 02:31:42 +00:00
parent 16c6545d56
commit 9e23ab9b5c
3 changed files with 19 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
src/backend/libpq/pqcomm.c
View File

@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/libpq/pqcomm.c,v 1.54 1998/09/10 04:07:59 vadim Exp $
* $Header: /cvsroot/pgsql/src/backend/libpq/pqcomm.c,v 1.55 1998/10/06 02:31:39 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -560,7 +560,8 @@ StreamServerPort(char *hostName, short portName, int *fdP)
* If the socket exists but nobody has an advisory lock on it we
* can safely delete the file.
*/
if ((lock_fd = open(sock_path, O_RDONLY | O_NONBLOCK, 0666)) >= 0)
#ifdef HAVE_FCNTL_SETLK
if ((lock_fd = open(sock_path, O_WRONLY | O_NONBLOCK, 0666)) >= 0)
{
struct flock lck;
@ -575,6 +576,7 @@ StreamServerPort(char *hostName, short portName, int *fdP)
TPRINTF(TRACE_VERBOSE, "flock failed for %s", sock_path);
close(lock_fd);
}
#endif /* HAVE_FCNTL_SETLK */
}
else
{
@ -609,7 +611,8 @@ StreamServerPort(char *hostName, short portName, int *fdP)
* Open the socket file and get an advisory lock on it. The
* lock_fd is left open to keep the lock.
*/
if ((lock_fd = open(sock_path, O_RDONLY | O_NONBLOCK, 0666)) >= 0)
#ifdef HAVE_FCNTL_SETLK
if ((lock_fd = open(sock_path, O_WRONLY | O_NONBLOCK, 0666)) >= 0)
{
struct flock lck;
@ -618,6 +621,7 @@ StreamServerPort(char *hostName, short portName, int *fdP)
if (fcntl(lock_fd, F_SETLK, &lck) != 0)
TPRINTF(TRACE_VERBOSE, "flock error for %s", sock_path);
}
#endif /* HAVE_FCNTL_SETLK */
}
listen(fd, SOMAXCONN);

9
src/configure.in
View File

@ -526,6 +526,15 @@ AC_TRY_LINK([#include <sys/types.h>
[AC_DEFINE(HAVE_UNION_SEMUN) AC_MSG_RESULT(yes)],
AC_MSG_RESULT(no))
AC_MSG_CHECKING(for fcntl(F_SETLK))
AC_TRY_LINK([#include <fcntl.h>],
[struct flock lck;
lck.l_whence = SEEK_SET; lck.l_start = lck.l_len = 0;
lck.l_type = F_WRLCK;
fcntl(0, F_SETLK, &lck);],
[AC_DEFINE(HAVE_FCNTL_SETLK) AC_MSG_RESULT(yes)],
AC_MSG_RESULT(no))
AC_MSG_CHECKING(for good DBL_MIN)
AC_TRY_RUN([#include <stdlib.h>
#include <math.h>

3
src/include/config.h.in
View File

@ -207,6 +207,9 @@ extern void srandom(int seed);
/* Set to 1 if you have union semun */
#undef HAVE_UNION_SEMUN
/* Set to 1 if you have F_SETLK option for fcntl() */
#undef HAVE_FCNTL_SETLK
/* Set to 1 if you want to USE_LOCALE */
#undef USE_LOCALE