/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #if defined(V9) || defined(BSD4_2) || defined(plan9)#define _BSD_EXTENSION #include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <string.h>#include <errno.h>#include <sys/types.h>#include <sys/stat.h> char *tempnam(char *dir, char *pfx){	int pid;	char *tnm;	struct stat stb;	static int seq = 0; 	if (dir == NULL)		dir = ".";#ifdef plan9	/* our access emulation has a race when checking for write access */	if (access(dir, R_OK|X_OK) == -1)#else	if (access(dir, R_OK|W_OK|X_OK) == -1)#endif		return NULL;	pid = getpid();	tnm = malloc(strlen(dir) + 1 + strlen(pfx) + 2*20 + 1);	if (tnm == NULL)		return NULL;	do {		sprintf(tnm, "%s/%s.%d.%d", dir, pfx, pid, seq++);		errno = 0;	} while (stat(tnm, &stb) >= 0 && seq < 256);	return tnm;}#endif