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#if defined(V9) || defined(BSD4_2) || defined(plan9)
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#define _BSD_EXTENSION
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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char *
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tempnam(char *dir, char *pfx)
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{
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	int pid;
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	char *tnm;
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	struct stat stb;
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	static int seq = 0;
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	if (dir == NULL)
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		dir = ".";
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#ifdef plan9
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	/* our access emulation has a race when checking for write access */
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	if (access(dir, R_OK|X_OK) == -1)
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#else
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	if (access(dir, R_OK|W_OK|X_OK) == -1)
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#endif
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		return NULL;
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	pid = getpid();
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	tnm = malloc(strlen(dir) + 1 + strlen(pfx) + 2*20 + 1);
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	if (tnm == NULL)
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		return NULL;
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	do {
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		sprintf(tnm, "%s/%s.%d.%d", dir, pfx, pid, seq++);
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		errno = 0;
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	} while (stat(tnm, &stb) >= 0 && seq < 256);
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	return tnm;
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}
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#endif