1 files changed, 80 insertions, 0 deletions
diff --git a/src/util/load_file.c b/src/util/load_file.c
new file mode 100644
index 0000000..4e575d1
--- /dev/null
+++ b/src/util/load_file.c
@@ -0,0 +1,80 @@
+/*++
+/* NAME
+/*	load_file 3
+/* SUMMARY
+/*	load file with some prejudice
+/* SYNOPSIS
+/*	#include <load_file.h>
+/*
+/*	void	load_file(path, action, context)
+/*	const char *path;
+/*	void	(*action)(VSTREAM, void *);
+/*	void	*context;
+/* DESCRIPTION
+/*	This routine reads a file and reads it again when the
+/*	file changed recently.
+/*
+/*	Arguments:
+/* .IP path
+/*	The file to be opened, read-only.
+/* .IP action
+/*	The function that presumably reads the file.
+/* .IP context
+/*	Application-specific context for the action routine.
+/* DIAGNOSTICS
+/*	Fatal errors: out of memory, cannot open file.
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <sys/stat.h>
+#include <time.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <vstream.h>
+#include <iostuff.h>
+#include <load_file.h>
+#include <warn_stat.h>
+
+/* load_file - load file with some prejudice */
+
+void    load_file(const char *path, LOAD_FILE_FN action, void *context)
+{
+    VSTREAM *fp;
+    struct stat st;
+    time_t  before;
+    time_t  after;
+
+    /*
+     * Read the file again if it is hot. This may result in reading a partial
+     * parameter name or missing end marker when a file changes in the middle
+     * of a read.
+     */
+    for (before = time((time_t *) 0); /* see below */ ; before = after) {
+	if ((fp = vstream_fopen(path, O_RDONLY, 0)) == 0)
+	    msg_fatal("open %s: %m", path);
+	action(fp, context);
+	if (fstat(vstream_fileno(fp), &st) < 0)
+	    msg_fatal("fstat %s: %m", path);
+	if (vstream_ferror(fp) || vstream_fclose(fp))
+	    msg_fatal("read %s: %m", path);
+	after = time((time_t *) 0);
+	if (st.st_mtime < before - 1 || st.st_mtime > after)
+	    break;
+	if (msg_verbose)
+	    msg_info("pausing to let %s cool down", path);
+	doze(300000);
+    }
+}