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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(int symbols)
{
char *cname, buf[PATH_MAX];
struct statfs st;
int old_transport = 0;
if (symbols)
cname = ".symbols";
else
cname = ".cmd";
if (statfs("/sys/kernel/debug", &st) == 0 && (int) st.f_type == (int) DEBUGFS_MAGIC) {
if (sprintf_chk(buf, "/sys/kernel/debug/systemtap/%s/%s", modname, cname))
return -1;
} else {
old_transport = 1;
if (sprintf_chk(buf, "/proc/systemtap/%s/%s", modname, cname))
return -1;
}
dbug(2, "Opening %s\n", buf);
control_channel = open(buf, O_RDWR);
if (control_channel < 0) {
if (attach_mod && errno == ENOENT)
err("ERROR: Can not attach. Module %s not running.\n", modname);
else
perr("Couldn't open control channel '%s'", buf);
return -1;
}
if (set_clexec(control_channel) < 0)
return -1;
return old_transport;
}
void close_ctl_channel(void)
{
if (control_channel > 0) {
close(control_channel);
control_channel = 0;
}
}
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