From de2723270f9a04d99137a3f6a7d6ba1e90b5d01b Mon Sep 17 00:00:00 2001
From: teodor <teodor>
Date: Mon, 7 Jul 2008 14:24:17 +0000
Subject: [PATCH] Use flock call instead of open's flags O_EXLOCK/O_SHLOCK

---
 sfxstr.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/sfxstr.c b/sfxstr.c
index 36d1f31..92c8233 100644
--- a/sfxstr.c
+++ b/sfxstr.c
@@ -30,6 +30,7 @@
 #include <errno.h>
 #include <string.h>
 #include <sys/types.h>
+#include <sys/file.h>
 #include <sys/uio.h>
 #include <unistd.h>
 #include <fcntl.h>
@@ -1019,9 +1020,11 @@ SFSWriteDump(SFSTree *info, char *filename) {
 	off_t 				size = info->totalen + SFSTDHSZ;
 	SFSTreeDumpHeader 	dh;
 
-	if ( (fd = open(filename, O_RDWR|O_CREAT|O_TRUNC|O_EXLOCK, 0666)) < 0 )
+	if ( (fd = open(filename, O_RDWR|O_CREAT|O_TRUNC, 0666)) < 0 )
 		tlog(TL_CRIT|TL_EXIT, "Can not open file '%s': %s", strerror(errno));
 
+	if ( flock(fd, LOCK_EX) < 0 )
+		tlog(TL_CRIT|TL_EXIT, "flock failed: %s", strerror(errno));
 	if ( lseek(fd, size, SEEK_SET) < 0 )
 		tlog(TL_CRIT|TL_EXIT, "lseek failed: %s", strerror(errno));
 
@@ -1049,6 +1052,7 @@ SFSWriteDump(SFSTree *info, char *filename) {
 		writeNode(&wp, fd, info->node);
 	}
 	
+	flock(fd, LOCK_UN);
 	close(fd);
 }
 
@@ -1100,8 +1104,10 @@ SFSReadDump(SFSTree *info, char *filename) {
 	
 	memset(info,0,sizeof(SFSTree));
 
-	if ( (fd = open(filename, O_RDONLY|O_SHLOCK)) < 0 )
+	if ( (fd = open(filename, O_RDONLY)) < 0 )
 		tlog(TL_CRIT|TL_EXIT, "Can not open file '%s': %s", strerror(errno));
+	if ( flock(fd, LOCK_SH) < 0 )
+		tlog(TL_CRIT|TL_EXIT, "flock failed: %s", strerror(errno));
 
 	if ( read(fd, &dh, SFSTDHSZ) != SFSTDHSZ )
 		tlog(TL_CRIT|TL_EXIT, "read failed: %s", strerror(errno));
@@ -1123,6 +1129,7 @@ SFSReadDump(SFSTree *info, char *filename) {
 	info->node = readNode(info, fd, buf, bufsize);
 	tfree(buf);
 
+	flock(fd, LOCK_UN);
 	close(fd);
 }
 
-- 
2.37.3