| #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; |
| } |
