Attempt to use the environment variable TMPDIR for the temporary

directory, defaulting to /tmp.

PR:		bin/16924
Reviewed by:	dd
MFC after:	2 weeks

2 files changed, 20 insertions, 3 deletions

diff --git a/lib/libc/stdio/tmpfile.c b/lib/libc/stdio/tmpfile.c
index e3e296b..5aabe03 100644
--- a/lib/libc/stdio/tmpfile.c
+++ b/lib/libc/stdio/tmpfile.c
@@ -46,6 +46,7 @@ static char sccsid[] = "@(#)tmpfile.c	8.1 (Berkeley) 6/4/93";
 #include <unistd.h>
 #include <errno.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 #include <paths.h>
 #include "un-namespace.h"
@@ -57,10 +58,17 @@ tmpfile()
 	FILE *fp;
 	int fd, sverrno;
 #define	TRAILER	"tmp.XXXXXX"
-	char buf[sizeof(_PATH_TMP) + sizeof(TRAILER)];
+	char *buf;
+	const char *tmpdir;
 
-	(void)memcpy(buf, _PATH_TMP, sizeof(_PATH_TMP) - 1);
-	(void)memcpy(buf + sizeof(_PATH_TMP) - 1, TRAILER, sizeof(TRAILER));
+	tmpdir = getenv("TMPDIR");
+	if (tmpdir == NULL)
+		tmpdir = _PATH_TMP;
+
+	(void)asprintf(&buf, "%s%s%s", tmpdir,
+	    (tmpdir[strlen(tmpdir) - 1] == '/') ? "" : "/", TRAILER);
+	if (buf == NULL)
+		return (NULL);
 
 	sigfillset(&set);
 	(void)_sigprocmask(SIG_BLOCK, &set, &oset);
@@ -69,6 +77,8 @@ tmpfile()
 	if (fd != -1)
 		(void)unlink(buf);
 
+	free(buf);
+
 	(void)_sigprocmask(SIG_SETMASK, &oset, NULL);
 
 	if (fd == -1)
diff --git a/lib/libc/stdio/tmpnam.3 b/lib/libc/stdio/tmpnam.3
index ed71236..0c4e861 100644
--- a/lib/libc/stdio/tmpnam.3
+++ b/lib/libc/stdio/tmpnam.3
@@ -67,6 +67,13 @@ returns, causing the file to be automatically deleted when the last
 reference to it is closed.
 The file is opened with the access value
 .Ql w+ .
+The file is created in the directory determined by the environment variable
+.Ev TMPDIR
+if set.
+The default location if
+.Ev TMPDIR
+is not set is
+.Pa /tmp .
 .Pp
 The
 .Fn tmpnam