tdo not depend on flock - plan9port - [fork] Plan 9 from user space

git clone git://src.adamsgaard.dk/plan9port

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commit c71af67adc9946fe2a560259f5e79174dfa07e8d

parent 9e863cf5617925a7f7e855207e56f94fc72a662e

Author: rsc 

Date:   Fri,  7 Jan 2005 07:19:35 +0000

do not depend on flock

Diffstat:
  M src/lib9/open.c                     |       7 ++++++-

1 file changed, 6 insertions(+), 1 deletion(-)
---

diff --git a/src/lib9/open.c b/src/lib9/open.c

t@@ -12,6 +12,7 @@ p9open(char *name, int mode)
 {
         int cexec, rclose;
         int fd, umode, lock, rdwr;
+        struct flock fl;
 
         rdwr = mode&3;
         umode = rdwr;
t@@ -34,7 +35,11 @@ p9open(char *name, int mode)
         fd = open(name, umode);
         if(fd >= 0){
                 if(lock){
-                        if(flock(fd, (rdwr==OREAD) ? LOCK_SH : LOCK_EX) < 0){
+                        fl.l_type = (rdwr==OREAD) ? F_RDLCK : F_WRLCK;
+                        fl.l_whence = SEEK_SET;
+                        fl.l_start = 0;
+                        fl.l_len = 0;
+                        if(fcntl(fd, F_SETLK, &fl) < 0){
                                 close(fd);
                                 return -1;
                         }