mirror of
https://github.com/9fans/plan9port.git
synced 2025-01-15 11:20:03 +00:00
62 lines
1.1 KiB
C
62 lines
1.1 KiB
C
#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
|
|
#endif
|
|
|
|
int
|
|
p9open(char *name, int mode)
|
|
{
|
|
int cexec, rclose;
|
|
int fd, umode, lock, rdwr;
|
|
struct flock fl;
|
|
|
|
rdwr = mode&3;
|
|
umode = rdwr;
|
|
cexec = mode&OCEXEC;
|
|
rclose = mode&ORCLOSE;
|
|
lock = mode&OLOCK;
|
|
mode &= ~(3|OCEXEC|ORCLOSE|OLOCK);
|
|
if(mode&OTRUNC){
|
|
umode |= O_TRUNC;
|
|
mode ^= OTRUNC;
|
|
}
|
|
if(mode&ODIRECT){
|
|
umode |= O_DIRECT;
|
|
mode ^= ODIRECT;
|
|
}
|
|
if(mode&ONONBLOCK){
|
|
umode |= O_NONBLOCK;
|
|
mode ^= ONONBLOCK;
|
|
}
|
|
if(mode&OAPPEND){
|
|
umode |= O_APPEND;
|
|
mode ^= OAPPEND;
|
|
}
|
|
if(mode){
|
|
werrstr("mode 0x%x not supported", mode);
|
|
return -1;
|
|
}
|
|
fd = open(name, umode);
|
|
if(fd >= 0){
|
|
if(lock){
|
|
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);
|
|
werrstr("lock: %r");
|
|
return -1;
|
|
}
|
|
}
|
|
if(cexec)
|
|
fcntl(fd, F_SETFL, FD_CLOEXEC);
|
|
if(rclose)
|
|
remove(name);
|
|
}
|
|
return fd;
|
|
}
|