/* -*- 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; } }