lib-util: Make useful function a common utility.

Signed-off-by: Andreas Schneider <asn@samba.org>

2 files changed, 37 insertions, 0 deletions

diff --git a/lib/util/util.c b/lib/util/util.c
index 7f30d436e8..4dd79266af 100644
--- a/lib/util/util.c
+++ b/lib/util/util.c
@@ -6,6 +6,7 @@
    Copyright (C) Simo Sorce 2001
    Copyright (C) Jim McDonough (jmcd@us.ibm.com)  2003.
    Copyright (C) James J Myers 2003
+   Copyright (C) Volker Lendecke 2010
    
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -61,6 +62,37 @@ _PUBLIC_ const char *tmpdir(void)
 
 
 /**
+ Create a tmp file, open it and immediately unlink it.
+ Returns the file descriptor or -1 on error.
+**/
+int create_unlink_tmp(const char *dir)
+{
+	char *fname;
+	int fd;
+
+	fname = talloc_asprintf(talloc_tos(), "%s/listenerlock_XXXXXX", dir);
+	if (fname == NULL) {
+		errno = ENOMEM;
+		return -1;
+	}
+	fd = mkstemp(fname);
+	if (fd == -1) {
+		TALLOC_FREE(fname);
+		return -1;
+	}
+	if (unlink(fname) == -1) {
+		int sys_errno = errno;
+		close(fd);
+		TALLOC_FREE(fname);
+		errno = sys_errno;
+		return -1;
+	}
+	TALLOC_FREE(fname);
+	return fd;
+}
+
+
+/**
  Check if a file exists - call vfs_file_exist for samba files.
 **/
 _PUBLIC_ bool file_exist(const char *fname)
diff --git a/lib/util/util.h b/lib/util/util.h
index b9734b07c8..7f0de26781 100644
--- a/lib/util/util.h
+++ b/lib/util/util.h
@@ -623,6 +623,11 @@ bool file_compare(const char *path1, const char *path2);
 _PUBLIC_ const char *tmpdir(void);
 
 /**
+ * Creates and immediately unlinks a file. Returns open file descriptor.
+ **/
+_PUBLIC_ int create_unlink_tmp(const char *dir);
+
+/**
  Check if a file exists - call vfs_file_exist for samba files.
 **/
 _PUBLIC_ bool file_exist(const char *fname);