tmpfile

FILE * tmpfile(void)

#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <paths.h>

FILE *
tmpfile(void)
{
	sigset_t set, oset;
	FILE *fp;
	int fd, sverrno;
#define	TRAILER	"tmp.XXXXXXXXXX"
	char buf[sizeof(_PATH_TMP) + sizeof(TRAILER)];

	(void)memcpy(buf, _PATH_TMP, sizeof(_PATH_TMP) - 1);
	(void)memcpy(buf + sizeof(_PATH_TMP) - 1, TRAILER, sizeof(TRAILER));

	sigfillset(&set);
	(void)sigprocmask(SIG_BLOCK, &set, &oset);

	fd = mkstemp(buf);
	if (fd != -1) {
		mode_t u;

		(void)unlink(buf);
		u = umask(0);
		(void)umask(u);
		(void)fchmod(fd, 0666 & ~u);
	}

	(void)sigprocmask(SIG_SETMASK, &oset, NULL);

	if (fd == -1)
		return (NULL);

	if ((fp = fdopen(fd, "w+")) == NULL) {
		sverrno = errno;
		(void)close(fd);
		errno = sverrno;
		return (NULL);
	}
	return (fp);
}