tdo not depend on flock - plan9port - [fork] Plan 9 from user space
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       ---
   DIR commit c71af67adc9946fe2a560259f5e79174dfa07e8d
   DIR parent 9e863cf5617925a7f7e855207e56f94fc72a662e
  HTML Author: rsc <devnull@localhost>
       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(-)
       ---
   DIR 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;
                                }