lib/fs/mkstemp/: mkostemp(): Split API from fmkomstemp()

This reduces the complexity of fmkomstemp().

Signed-off-by: Alejandro Colomar <alx@kernel.org>

lib/Makefile.am

@@ -105,6 +105,8 @@ libshadow_la_SOURCES = \
 	fputsx.c \
 	fs/mkstemp/fmkomstemp.c \
 	fs/mkstemp/fmkomstemp.h \
+	fs/mkstemp/mkomstemp.c \
+	fs/mkstemp/mkomstemp.h \
 	fs/readlink/areadlink.c \
 	fs/readlink/areadlink.h \
 	fs/readlink/readlinknul.c \

lib/fs/mkstemp/fmkomstemp.h

@@ -9,11 +9,11 @@
 #include <config.h>
 
 #include <stdio.h>
-#include <stdlib.h>
-#include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
 
+#include "fs/mkstemp/mkomstemp.h"
+
 
 inline FILE *fmkomstemp(char *template, unsigned int flags, mode_t m);
 
@@ -24,13 +24,10 @@ fmkomstemp(char *template, unsigned int flags, mode_t m)
 	int   fd;
 	FILE  *fp;
 
-	fd = mkostemp(template, flags);
+	fd = mkomstemp(template, flags, m);
 	if (fd == -1)
 		return NULL;
 
-	if (fchmod(fd, m) == -1)
-		goto fail;
-
 	fp = fdopen(fd, "w");
 	if (fp == NULL)
 		goto fail;

lib/fs/mkstemp/mkomstemp.c

@@ -0,0 +1,12 @@
+// SPDX-FileCopyrightText: 2024, Alejandro Colomar <alx@kernel.org>
+// SPDX-License-Identifier: BSD-3-Clause
+
+
+#include <config.h>
+
+#include "fs/mkstemp/mkomstemp.h"
+
+#include <sys/types.h>
+
+
+extern inline int mkomstemp(char *template, unsigned int flags, mode_t m);

lib/fs/mkstemp/mkomstemp.h

@@ -0,0 +1,40 @@
+// SPDX-FileCopyrightText: 2024, Alejandro Colomar <alx@kernel.org>
+// SPDX-License-Identifier: BSD-3-Clause
+
+
+#ifndef SHADOW_INCLUDE_LIB_FS_MKSTEMP_MKOMSTEMP_H_
+#define SHADOW_INCLUDE_LIB_FS_MKSTEMP_MKOMSTEMP_H_
+
+
+#include <config.h>
+
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+
+inline int mkomstemp(char *template, unsigned int flags, mode_t m);
+
+
+inline int
+mkomstemp(char *template, unsigned int flags, mode_t m)
+{
+	int  fd;
+
+	fd = mkostemp(template, flags);
+	if (fd == -1)
+		return -1;
+
+	if (fchmod(fd, m) == -1)
+		goto fail;
+
+	return fd;
+fail:
+	close(fd);
+	unlink(template);
+	return -1;
+}
+
+
+#endif  // include guard