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/* -*- linux-c -*-
*
* staprun.c - SystemTap module loader
*
* 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) 2005-2007 Red Hat, Inc.
*
*/
#include "staprun.h"
#include <pwd.h>
extern char *optarg;
extern int optopt;
extern int optind;
int verbose = 0;
int target_pid = 0;
unsigned int buffer_size = 0;
char modname[128];
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;
int attach_mod = 0;
int load_only = 0;
static void path_parse_modname (char *path)
{
char *mptr = rindex (path, '/');
if (mptr == NULL)
mptr = path;
else
mptr++;
if (strlen(mptr) >= sizeof(modname)) {
err("Module name larger than modname buffer.\n");
exit (-1);
}
strcpy(modname, mptr);
mptr = rindex(modname, '.');
if (mptr)
*mptr = '\0';
}
static void usage(char *prog)
{
fprintf(stderr, "\n%s [-v] [-c cmd ] [-x pid] [-u user]\n"
"\t[-A modname]] [-L] [-b bufsize] [-o FILE] kmod-name [kmod-options]\n", prog);
fprintf(stderr, "-v increase Verbosity.\n");
fprintf(stderr, "-c cmd. Command \'cmd\' will be run and staprun will exit when it does.\n");
fprintf(stderr, " _stp_target will contain the pid for the command.\n");
fprintf(stderr, "-x pid. Sets _stp_target to 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 in bulk mode.\n");
fprintf(stderr, "-L Load module and start probes, then detach.\n");
fprintf(stderr, "-A modname. Attach to systemtap module modname.\n");
exit(1);
}
int main(int argc, char **argv)
{
int c;
setup_signals();
while ((c = getopt(argc, argv, "ALvb:t:d:c:o:u:x:")) != EOF) {
switch (c) {
case 'v':
verbose++;
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':
case 'x':
target_pid = atoi(optarg);
break;
case 'd':
/* obsolete internal option used by stap */
break;
case 'c':
target_cmd = optarg;
break;
case 'o':
outfile_name = optarg;
break;
case 'u':
username = optarg;
break;
case 'A':
attach_mod = 1;
break;
case 'L':
load_only = 1;
break;
default:
usage(argv[0]);
}
}
if (verbose) {
if (buffer_size)
printf ("Using a buffer of %u bytes.\n", buffer_size);
}
if (optind < argc) {
modpath = argv[optind++];
path_parse_modname(modpath);
dbug(2, "modpath=\"%s\", modname=\"%s\"\n", modpath, modname);
}
if (optind < argc) {
if (attach_mod) {
fprintf(stderr, "Cannot have module options with attach (-A).\n");
usage(argv[0]);
} else {
unsigned start_idx = 3; /* reserve three slots in modoptions[] */
while (optind < argc && start_idx+1 < MAXMODOPTIONS)
modoptions[start_idx++] = argv[optind++];
modoptions[start_idx] = NULL;
}
}
if (!modpath) {
fprintf (stderr, "Need a module to load.\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();
}
/* now bump the priority */
setpriority (PRIO_PROCESS, 0, -10);
if (init_staprun())
exit(1);
if (stp_main_loop()) {
fprintf(stderr,"Couldn't enter main loop. Exiting.\n");
exit(1);
}
return 0;
}
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