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/*
* stp.c - stp 'daemon'
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Copyright (C) 2005 IBM Corporation
* Copyright (C) 2005-2006 Red Hat, Inc.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/wait.h>
#include <sys/statfs.h>
#include <pwd.h>
#include "librelay.h"
extern char *optarg;
extern int optopt;
extern int optind;
int print_only = 0;
int quiet = 0;
int merge = 1;
int verbose = 0;
int enable_relayfs = 1;
int target_pid = 0;
int driver_pid = 0;
unsigned int buffer_size = 0;
char *modname = NULL;
char *modpath = NULL;
#define MAXMODOPTIONS 64
char *modoptions[MAXMODOPTIONS];
char *target_cmd = NULL;
char *outfile_name = NULL;
char *username = NULL;
uid_t cmd_uid;
gid_t cmd_gid;
/* relayfs base file name */
static char stpd_filebase[1024];
/* if no output file name is specified, use this */
#define DEFAULT_OUTFILE_NAME "probe.out"
/* stp_check script */
#ifdef PKGLIBDIR
char *stp_check=PKGLIBDIR "/stp_check";
#else
char *stp_check="stp_check";
#endif
static void usage(char *prog)
{
fprintf(stderr, "\n%s [-m] [-p] [-q] [-r] [-c cmd ] [-t pid]\n"
"\t[-b bufsize] [-o FILE] kmod-name [kmod-options]\n", prog);
fprintf(stderr, "-m Don't merge per-cpu files.\n");
fprintf(stderr, "-p Print only. Don't log to files.\n");
fprintf(stderr, "-q Quiet. Don't display trace to stdout.\n");
fprintf(stderr, "-r Disable running stp_check and loading relayfs module.\n");
fprintf(stderr, "-c cmd. Command \'cmd\' will be run and stpd will exit when it does.\n");
fprintf(stderr, " _stp_target will contain the pid for the command.\n");
fprintf(stderr, "-t pid. Sets _stp_target to pid.\n");
fprintf(stderr, "-d pid. Pass the systemtap driver's pid.\n");
fprintf(stderr, "-o FILE. Send output to FILE.\n");
fprintf(stderr, "-u username. Run commands as username.\n");
fprintf(stderr, "-b buffer size. The systemtap module will specify a buffer size.\n");
fprintf(stderr, " Setting one here will override that value. The value should be\n");
fprintf(stderr, " an integer between 1 and 64 which be assumed to be the\n");
fprintf(stderr, " buffer size in MB. That value will be per-cpu if relayfs is used.\n");
exit(1);
}
int main(int argc, char **argv)
{
int c, status;
pid_t pid;
struct statfs st;
while ((c = getopt(argc, argv, "mpqrb:n:t:d:c:vo:u:")) != EOF)
{
switch (c) {
case 'm':
merge = 0;
break;
case 'p':
print_only = 1;
break;
case 'q':
quiet = 1;
break;
case 'v':
verbose = 1;
break;
case 'r':
enable_relayfs = 0;
break;
case 'b':
{
int size = (unsigned)atoi(optarg);
if (!size)
usage(argv[0]);
if (size > 64) {
fprintf(stderr, "Maximum buffer size is 64 (MB)\n");
exit(1);
}
buffer_size = size;
break;
}
case 't':
target_pid = atoi(optarg);
break;
case 'd':
driver_pid = atoi(optarg);
break;
case 'c':
target_cmd = optarg;
break;
case 'o':
outfile_name = optarg;
break;
case 'u':
username = optarg;
break;
default:
usage(argv[0]);
}
}
if (verbose) {
if (buffer_size)
printf ("Using a buffer of %u bytes.\n", buffer_size);
}
if (optind < argc)
{
/* Collect both full path and just the trailing module name. */
modpath = argv[optind++];
modname = rindex (modpath, '/');
if (modname == NULL)
modname = modpath;
else
modname++; /* skip over / */
}
if (optind < argc)
{
unsigned start_idx = 3; /* reserve three slots in modoptions[] */
while (optind < argc && start_idx+1 < MAXMODOPTIONS)
modoptions[start_idx++] = argv[optind++];
/* Redundantly ensure that there is a NULL pointer at the end
of modoptions[]. */
modoptions[start_idx] = NULL;
}
if (!modname) {
fprintf (stderr, "Cannot invoke daemon without probe module\n");
usage(argv[0]);
}
if (print_only && quiet) {
fprintf (stderr, "Cannot do \"-p\" and \"-q\" both.\n");
usage(argv[0]);
}
if (username) {
struct passwd *pw = getpwnam(username);
if (!pw) {
fprintf(stderr, "Cannot find user \"%s\".\n", username);
exit(1);
}
cmd_uid = pw->pw_uid;
cmd_gid = pw->pw_gid;
} else {
cmd_uid = getuid();
cmd_gid = getgid();
}
if (enable_relayfs) {
/* now run the _stp_check script */
if ((pid = fork()) < 0) {
perror ("fork of stp_check failed.");
exit(-1);
} else if (pid == 0) {
if (execlp(stp_check, stp_check, NULL) < 0)
_exit (-1);
}
if (waitpid(pid, &status, 0) < 0) {
perror("waitpid");
exit(-1);
}
if (WIFEXITED(status) && WEXITSTATUS(status)) {
perror (stp_check);
fprintf(stderr, "Could not execute %s\n", stp_check);
exit(1);
}
if (!outfile_name)
outfile_name = DEFAULT_OUTFILE_NAME;
}
if (statfs("/mnt/relay", &st) < 0)
sprintf(stpd_filebase, "/proc/systemtap/stap_%d/cpu", driver_pid);
else
sprintf(stpd_filebase, "/mnt/relay/%d/cpu", getpid());
if (init_stp(stpd_filebase, !quiet)) {
//fprintf(stderr, "Couldn't initialize stpd. Exiting.\n");
exit(1);
}
if (stp_main_loop()) {
fprintf(stderr,"Couldn't enter main loop. Exiting.\n");
exit(1);
}
return 0;
}
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