X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fdata%2Fmake-file.h;h=31795bebe58db8d4b66d187c2ba9f3978369d7e2;hb=b2be264914a7f376fa00d26de702c7077f086ca8;hp=ce56758ee87d2b9abc9d80f57e0958a636d30e5c;hpb=43b1296aafe7582e7dbe6c2b6a8b478d7d9b0fcf;p=pspp-builds.git
diff --git a/src/data/make-file.h b/src/data/make-file.h
index ce56758e..31795beb 100644
--- a/src/data/make-file.h
+++ b/src/data/make-file.h
@@ -1,5 +1,5 @@
/* PSPP - a program for statistical analysis.
- Copyright (C) 2004 Free Software Foundation, Inc.
+ Copyright (C) 2004, 2010 Free Software Foundation, Inc.
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
@@ -14,9 +14,12 @@
You should have received a copy of the GNU General Public License
along with this program. If not, see . */
-#ifndef MKFILE_H
-#define MKFILE_H
+#ifndef MAKE_FILE_H
+#define MAKE_FILE_H
+#include
+#include
+#include
/* Creates a temporary file and stores its name in *FILE_NAME and
a file descriptor for it in *FD. Returns success. Caller is
@@ -29,4 +32,31 @@ int make_temp_file (int *fd, char **file_name);
responsible for freeing *FILE_NAME. */
int make_unique_file_stream (FILE **fp, char **file_name) ;
+
+/* Prepares to atomically replace a (potentially) existing file
+ by a new file, by creating a temporary file with the given
+ PERMISSIONS bits in the same directory as *FILE_NAME.
+
+ Special files are an exception: they are not atomically
+ replaced but simply opened for writing.
+
+ If successful, stores the temporary file's name in *TMP_NAME
+ and a stream for it opened according to MODE (which should be
+ "w" or "wb") in *FP. Returns a ticket that can be used to
+ commit or abort the file replacement. If neither action has
+ yet been taken, program termination via signal will cause
+ *TMP_FILE to be unlinked.
+
+ The caller is responsible for closing *FP, but *TMP_NAME is
+ owned by the callee. */
+struct replace_file *replace_file_start (const char *file_name,
+ const char *mode, mode_t permissions,
+ FILE **fp, char **tmp_name);
+
+/* Commits or aborts the replacement of a (potentially) existing
+ file by a new file, using the ticket returned by
+ replace_file_start. Returns success. */
+bool replace_file_commit (struct replace_file *);
+bool replace_file_abort (struct replace_file *);
+
#endif /* make-file.h */