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/*++
/* NAME
/* timed_ipc 3
/* SUMMARY
/* enforce IPC timeout on stream
/* SYNOPSIS
/* #include <time_ipc.h>
/*
/* void timed_ipc_setup(stream)
/* VSTREAM *stream;
/* DESCRIPTION
/* timed_ipc() enforces on the specified stream the timeout as
/* specified via the \fIipc_timeout\fR configuration parameter:
/* a read or write operation fails if it does not succeed within
/* \fIipc_timeout\fR seconds. This deadline exists as a safety
/* measure for communication between mail subsystem programs,
/* and should never be exceeded.
/* DIAGNOSTICS
/* Panic: sanity check failed. Fatal error: deadline exceeded.
/* 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 <unistd.h>
/* Utility library. */
#include <msg.h>
#include <vstream.h>
#include <iostuff.h>
/* Global library. */
#include "mail_params.h"
#include "timed_ipc.h"
/* timed_ipc_read - read with timeout */
static int timed_ipc_read(int fd, void *buf, unsigned len)
{
if (read_wait(fd, var_ipc_timeout) < 0)
msg_fatal("timed_ipc_read: command read timeout");
return (read(fd, buf, len));
}
/* timed_ipc_write - read with timeout */
static int timed_ipc_write(int fd, void *buf, unsigned len)
{
if (write_wait(fd, var_ipc_timeout) < 0)
msg_fatal("timed_ipc_write: command write timeout");
return (write(fd, buf, len));
}
/* timed_ipc_setup - enable ipc with timeout */
void timed_ipc_setup(VSTREAM *stream)
{
if (var_ipc_timeout <= 0)
msg_panic("timed_ipc_setup: bad ipc_timeout %d", var_ipc_timeout);
vstream_control(stream,
VSTREAM_CTL_READ_FN, timed_ipc_read,
VSTREAM_CTL_WRITE_FN, timed_ipc_write,
VSTREAM_CTL_END);
}
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