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/*++
/* 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);
}
}
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