| #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; | |
| } |