add OLOCK
diff --git a/src/lib9/open.c b/src/lib9/open.c
index 9d9ba31..5b4935c 100644
--- a/src/lib9/open.c
+++ b/src/lib9/open.c
@@ -1,6 +1,7 @@
#define _GNU_SOURCE /* for Linux O_DIRECT */
#include <u.h>
#define NOPLAN9DEFINES
+#include <sys/file.h>
#include <libc.h>
#ifndef O_DIRECT
#define O_DIRECT 0
@@ -10,12 +11,13 @@
p9open(char *name, int mode)
{
int cexec, rclose;
- int fd, umode;
+ int fd, umode, lock;
umode = mode&3;
cexec = mode&OCEXEC;
rclose = mode&ORCLOSE;
- mode &= ~(3|OCEXEC|ORCLOSE);
+ lock = mode&OLOCK;
+ mode &= ~(3|OCEXEC|ORCLOSE|OLOCK);
if(mode&OTRUNC){
umode |= O_TRUNC;
mode ^= OTRUNC;
@@ -30,6 +32,12 @@
}
fd = open(name, umode);
if(fd >= 0){
+ if(lock){
+ if(flock(fd, (mode==OREAD) ? LOCK_SH : LOCK_EX) < 0){
+ close(fd);
+ return -1;
+ }
+ }
if(cexec)
fcntl(fd, F_SETFL, FD_CLOEXEC);
if(rclose)
