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/* -*- linux-c -*-
*
* ctl.c - staprun control channel
*
* This file is part of systemtap, and is free software. You can
* redistribute it and/or modify it under the terms of the GNU General
* Public License (GPL); either version 2, or (at your option) any
* later version.
*
* Copyright (C) 2007 Red Hat Inc.
*/
#include "staprun.h"
int init_ctl_channel(void)
{
char buf[128];
struct statfs st;
if (statfs("/sys/kernel/debug", &st) == 0 && (int) st.f_type == (int) DEBUGFS_MAGIC)
sprintf (buf, "/sys/kernel/debug/systemtap_%d/cmd", getpid());
else
sprintf (buf, "/proc/systemtap_%d/cmd", getpid());
dbug("Opening %s\n", buf);
control_channel = open(buf, O_RDWR);
if (control_channel < 0) {
fprintf(stderr, "ERROR: couldn't open control channel %s: errcode = %s\n", buf, strerror(errno));
return -1;
}
return 0;
}
void close_ctl_channel(void)
{
if (control_channel > 0) {
close(control_channel);
control_channel = 0;
}
}
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