#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 intp9open(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;}