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boinc/client/client_state.C

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// The contents of this file are subject to the Mozilla Public License
// Version 1.0 (the "License"); you may not use this file except in
// compliance with the License. You may obtain a copy of the License at
// http://www.mozilla.org/MPL/
//
// Software distributed under the License is distributed on an "AS IS"
// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
// License for the specific language governing rights and limitations
// under the License.
//
// The Original Code is the Berkeley Open Infrastructure for Network Computing.
//
// The Initial Developer of the Original Code is the SETI@home project.
// Portions created by the SETI@home project are Copyright (C) 2002
// University of California at Berkeley. All Rights Reserved.
//
// Contributor(s):
//
#include "windows_cpp.h"
#include "error_numbers.h"
#include <stdio.h>
#include <time.h>
#include "account.h"
#include "error_numbers.h"
#include "file_names.h"
#include "filesys.h"
#include "hostinfo.h"
#include "log_flags.h"
#include "parse.h"
#include "speed_stats.h"
#include "client_state.h"
#define SECONDS_IN_MONTH 2592000
CLIENT_STATE gstate;
CLIENT_STATE::CLIENT_STATE() {
net_xfers = new NET_XFER_SET;
http_ops = new HTTP_OP_SET(net_xfers);
file_xfers = new FILE_XFER_SET(http_ops);
pers_xfers = new PERS_FILE_XFER_SET(file_xfers);
scheduler_op = new SCHEDULER_OP(http_ops);
client_state_dirty = false;
exit_when_idle = false;
run_time_test = true;
giveup_after = PERS_GIVEUP;
contacted_sched_server = false;
activities_suspended = false;
core_client_version = VERSION;
platform_name = HOST;
exit_after = -1;
app_started = 0;
max_transfer_rate = 9999999;
max_bytes = 0;
}
int CLIENT_STATE::init() {
int retval;
srand(clock());
// TODO: set this to actual # of CPUs (or less, depending on prefs?)
//
nslots = 1;
// Read the global preferences file, if it exists.
//
retval = global_prefs.parse_file();
if (retval) {
printf("No global preferences file; will use defaults.\n");
}
// parse account files.
// If there are none, prompt user for project URL and create file
//
retval = parse_account_files();
if (projects.size() == 0) {
retval = get_initial_project();
if (retval) {
printf("can't get initial project\n");
return retval;
}
retval = parse_account_files();
if (projects.size() == 0) {
if (retval) {
printf("can't get initial project\n");
return retval;
}
}
}
// Parse the client state file,
// ignoring any <project> tags (and associated stuff)
// for projects with no account file
//
parse_state_file();
if (log_flags.state_debug) {
print_counts();
}
// set up the project and slot directories
//
make_project_dirs();
make_slot_dirs();
// Run the time tests and host information check if needed
// TODO: break time tests and host information check into two
// separate functions?
if (gstate.run_time_tests()) {
gstate.time_tests();
}
// Restart any tasks that were running when we last quit the client
gstate.restart_tasks();
return 0;
}
// Returns true if time tests should be run
// This is determined by seeing if the user passed the "-no_time_test"
// flag or if it's been a month since we last checked time stats
//
bool CLIENT_STATE::run_time_tests() {
return (run_time_test && (
difftime(time(0), (time_t)host_info.p_calculated) > SECONDS_IN_MONTH
));
}
// gets info about the host
// NOTE: this locks up the process for 10-20 seconds,
// so it should be called very seldom
//
int CLIENT_STATE::time_tests() {
if (log_flags.measurement_debug) {
printf("Getting general host information.\n");
}
clear_host_info(host_info);
get_host_info(host_info); // this is platform dependent
#if 0
double fpop_test_secs = 2.0;
double iop_test_secs = 2.0;
double mem_test_secs = 2.0;
if (log_flags.measurement_debug) {
printf(
"Running floating point test for about %.1f seconds.\n",
fpop_test_secs
);
}
host_info.p_fpops = run_double_prec_test(fpop_test_secs); //these are not
if (log_flags.measurement_debug) {
printf(
"Running integer test for about %.1f seconds.\n",
iop_test_secs
);
}
host_info.p_iops = run_int_test(iop_test_secs);
if (log_flags.measurement_debug) {
printf(
"Running memory bandwidth test for about %.1f seconds.\n",
mem_test_secs
);
}
host_info.p_membw = run_mem_bandwidth_test(mem_test_secs);
#else
host_info.p_fpops = 1e9;
host_info.p_iops = 1e9;
host_info.p_membw = 4e9;
host_info.m_cache = 1e6;
#endif
host_info.p_calculated = (double)time(0);
return 0;
}
// Return the maximum allowed disk usage as determined by user preferences.
// Since there are three different settings in the prefs, it returns the least
// of the three.
double CLIENT_STATE::allowed_disk_usage() {
double percent_space, min_val;
// Calculate allowed disk usage based on % pref
//
percent_space = host_info.d_total*global_prefs.disk_max_used_pct/100.0;
min_val = host_info.d_free - global_prefs.disk_min_free_gb*1e9;
// Return the minimum of the three
//
return min(min(global_prefs.disk_max_used_gb*1e9, percent_space), min_val);
}
double CLIENT_STATE::current_disk_usage() {
double sz = 0;
sz = dir_size(".");
return sz;
}
// See if (on the basis of user prefs) we should suspend activities.
// If so, suspend tasks
//
int CLIENT_STATE::check_suspend_activities() {
bool should_suspend = false;
if (global_prefs.dont_run_on_batteries && host_is_running_on_batteries()) {
should_suspend = true;
}
if (!user_idle) {
should_suspend = true;
}
if (should_suspend) {
if (!activities_suspended) {
if (log_flags.task_debug) printf("SUSPENDING ACTIVITIES\n");
active_tasks.suspend_all();
}
} else {
if (activities_suspended) {
if (log_flags.task_debug) printf("UNSUSPENDING ACTIVITIES\n");
active_tasks.unsuspend_all();
}
}
activities_suspended = should_suspend;
return 0;
}
static void print_log(char* p) {
if (log_flags.poll_debug) {
printf(p);
}
}
// do_something is where all the action happens. This is part of the
// finite state machine abstraction of the client. Each of the key
// elements of the client is given a chance to perform work here.
// return true if something happened
// TODO: handle errors passed back up to here?
//
bool CLIENT_STATE::do_something() {
int nbytes=0;
bool action = false, x;
check_suspend_activities();
if (!activities_suspended) {
// Call these functions in bottom to top order with
// respect to the FSM hierarchy
if (max_bytes > 0)
net_xfers->poll(max_bytes, nbytes);
if (nbytes) { max_bytes -= nbytes; action=true; print_log("net_xfers\n"); }
x = http_ops->poll();
if (x) {action=true; print_log("http_ops::poll\n"); }
x = file_xfers->poll();
if (x) {action=true; print_log("file_xfers::poll\n"); }
x = active_tasks.poll();
if (x) {action=true; print_log("active_tasks::poll\n"); }
x = active_tasks.poll_time();
if (x) {action=true; print_log("active_tasks::poll_time\n"); }
x = scheduler_rpc_poll();
if (x) {action=true; print_log("scheduler_rpc_poll\n"); }
x = start_apps();
if (x) {action=true; print_log("start_apps\n"); }
x = pers_xfers->poll();
if (x) {action=true; print_log("pers_xfers->poll\n"); }
x = handle_running_apps();
if (x) {action=true; print_log("handle_running_apps\n"); }
x = handle_pers_file_xfers();
if (x) {action=true; print_log("handle_pers_file_xfers\n"); }
x = garbage_collect();
if (x) {action=true; print_log("garbage_collect\n"); }
x = update_results();
if (x) {action=true; print_log("update_results\n"); }
write_state_file_if_needed();
}
if (!action) {
time_stats.update(true, !activities_suspended);
max_bytes = max_transfer_rate;
}
return action;
}
// Parse the client_state.xml file
//
int CLIENT_STATE::parse_state_file() {
char buf[256];
FILE* f = fopen(STATE_FILE_NAME, "r");
PROJECT temp_project, *project;
int retval=0;
if (!f) {
if (log_flags.state_debug) {
printf("No state file; will create one\n");
}
return ERR_FOPEN;
}
fgets(buf, 256, f);
if (!match_tag(buf, "<client_state>")) {
retval = ERR_XML_PARSE;
goto done;
}
while (fgets(buf, 256, f)) {
if (match_tag(buf, "</client_state>")) {
retval = 0;
break;
} else if (match_tag(buf, "<project>")) {
temp_project.parse_state(f);
project = lookup_project(temp_project.master_url);
if (project) {
project->copy_state_fields(temp_project);
} else {
fprintf(stderr,
"Project %s found in state file but not prefs.\n",
temp_project.master_url
);
}
} else if (match_tag(buf, "<app>")) {
APP* app = new APP;
app->parse(f);
if (project) {
retval = link_app(project, app);
if (!retval) apps.push_back(app);
} else {
delete app;
}
} else if (match_tag(buf, "<file_info>")) {
FILE_INFO* fip = new FILE_INFO;
fip->parse(f, false);
if (project) {
retval = link_file_info(project, fip);
if (!retval) file_infos.push_back(fip);
// If the file had a failure before, there's no reason
// to start another file transfer
if (fip->had_failure()) {
if (fip->pers_file_xfer) delete fip->pers_file_xfer;
fip->pers_file_xfer = NULL;
}
// Init PERS_FILE_XFER and push it onto pers_file_xfer stack
if (fip->pers_file_xfer) {
fip->pers_file_xfer->init(fip, fip->upload_when_present);
pers_xfers->insert( fip->pers_file_xfer );
}
} else {
delete fip;
}
} else if (match_tag(buf, "<app_version>")) {
APP_VERSION* avp = new APP_VERSION;
avp->parse(f);
if (project) {
retval = link_app_version(project, avp);
if (!retval) app_versions.push_back(avp);
} else {
delete avp;
}
} else if (match_tag(buf, "<workunit>")) {
WORKUNIT* wup = new WORKUNIT;
wup->parse(f);
if (project) {
retval = link_workunit(project, wup);
if (!retval) workunits.push_back(wup);
} else {
delete wup;
}
} else if (match_tag(buf, "<result>")) {
RESULT* rp = new RESULT;
rp->parse_state(f);
if (project) {
retval = link_result(project, rp);
if (!retval) results.push_back(rp);
rp->state = RESULT_NEW;
} else {
fprintf(stderr, "error: link_result failed\n");
delete rp;
}
} else if (match_tag(buf, "<host_info>")) {
host_info.parse(f);
} else if (match_tag(buf, "<time_stats>")) {
time_stats.parse(f);
} else if (match_tag(buf, "<net_stats>")) {
net_stats.parse(f);
} else if (match_tag(buf, "<active_task_set>")) {
active_tasks.parse(f, this);
} else if (match_tag(buf, "<platform_name>")) {
// should match out current platform name
} else if (match_tag(buf, "<version>")) {
// could put logic here to detect incompatible state files
// after core client update
} else {
fprintf(stderr, "CLIENT_STATE::parse_state_file: unrecognized: %s\n", buf);
retval = ERR_XML_PARSE;
goto done;
}
}
done:
fclose(f);
return retval;
}
// Write the client_state.xml file
//
int CLIENT_STATE::write_state_file() {
unsigned int i, j;
FILE* f = fopen(STATE_FILE_TEMP, "w");
int retval;
if (log_flags.state_debug) {
printf("Writing state file\n");
}
if (!f) {
fprintf(stderr, "can't open temp state file: %s\n", STATE_FILE_TEMP);
return ERR_FOPEN;
}
fprintf(f, "<client_state>\n");
host_info.write(f);
time_stats.write(f, false);
net_stats.write(f, false);
for (j=0; j<projects.size(); j++) {
PROJECT* p = projects[j];
p->write_state(f);
for (i=0; i<apps.size(); i++) {
if (apps[i]->project == p) apps[i]->write(f);
}
for (i=0; i<file_infos.size(); i++) {
if (file_infos[i]->project == p) {
file_infos[i]->write(f, false);
}
}
for (i=0; i<app_versions.size(); i++) {
if (app_versions[i]->project == p) app_versions[i]->write(f);
}
for (i=0; i<workunits.size(); i++) {
if (workunits[i]->project == p) workunits[i]->write(f);
}
for (i=0; i<results.size(); i++) {
if (results[i]->project == p) results[i]->write(f, false);
}
}
active_tasks.write(f);
fprintf(f,
"<platform_name>%s</platform_name>\n"
"<core_client_version>%d</core_client_version>\n",
platform_name,
core_client_version
);
fprintf(f, "</client_state>\n");
fclose(f);
retval = boinc_rename(STATE_FILE_TEMP, STATE_FILE_NAME);
if (log_flags.state_debug) {
printf("Done writing state file\n");
}
if (retval) return ERR_RENAME;
return 0;
}
// TODO: write no more often than X seconds
// Write the client_state.xml file if necessary
//
int CLIENT_STATE::write_state_file_if_needed() {
int retval;
if (client_state_dirty) {
client_state_dirty = false;
retval = write_state_file();
if (retval) return retval;
}
return 0;
}
// See if the project specified by master_url already exists
// in the client state record.
//
PROJECT* CLIENT_STATE::lookup_project(char* master_url) {
for (unsigned int i=0; i<projects.size(); i++) {
if (!strcmp(master_url, projects[i]->master_url)) {
return projects[i];
}
}
return 0;
}
APP* CLIENT_STATE::lookup_app(PROJECT* p, char* name) {
for (unsigned int i=0; i<apps.size(); i++) {
APP* app = apps[i];
if (app->project == p && !strcmp(name, app->name)) return app;
}
return 0;
}
RESULT* CLIENT_STATE::lookup_result(PROJECT* p, char* name) {
for (unsigned int i=0; i<results.size(); i++) {
RESULT* rp = results[i];
if (rp->project == p && !strcmp(name, rp->name)) return rp;
}
return 0;
}
WORKUNIT* CLIENT_STATE::lookup_workunit(PROJECT* p, char* name) {
for (unsigned int i=0; i<workunits.size(); i++) {
WORKUNIT* wup = workunits[i];
if (wup->project == p && !strcmp(name, wup->name)) return wup;
}
return 0;
}
APP_VERSION* CLIENT_STATE::lookup_app_version(APP* app, int version_num) {
for (unsigned int i=0; i<app_versions.size(); i++) {
APP_VERSION* avp = app_versions[i];
if (avp->app == app && version_num==avp->version_num) {
return avp;
}
}
return 0;
}
FILE_INFO* CLIENT_STATE::lookup_file_info(PROJECT* p, char* name) {
for (unsigned int i=0; i<file_infos.size(); i++) {
FILE_INFO* fip = file_infos[i];
if (fip->project == p && !strcmp(fip->name, name)) {
return fip;
}
}
return 0;
}
// Find the active task for a given workunit
//
ACTIVE_TASK* CLIENT_STATE::lookup_active_task_by_result(RESULT* rep)
{
for(unsigned int i = 0; i < active_tasks.active_tasks.size(); i ++) {
if(active_tasks.active_tasks[i]->result == rep) return active_tasks.active_tasks[i];
}
return NULL;
}
// functions to create links between state objects
// (which, in their XML form, reference one another by name)
//
int CLIENT_STATE::link_app(PROJECT* p, APP* app) {
app->project = p;
return 0;
}
int CLIENT_STATE::link_file_info(PROJECT* p, FILE_INFO* fip) {
fip->project = p;
return 0;
}
int CLIENT_STATE::link_app_version(PROJECT* p, APP_VERSION* avp) {
APP* app;
FILE_INFO* fip;
FILE_REF file_ref;
unsigned int i;
avp->project = p;
app = lookup_app(p, avp->app_name);
if (!app) {
fprintf(stderr,
"app_version refers to nonexistent app: %s\n", avp->app_name
);
return 1;
}
avp->app = app;
for (i=0; i<avp->app_files.size(); i++) {
file_ref = avp->app_files[i];
fip = lookup_file_info(p, file_ref.file_name);
if (!fip) {
fprintf(stderr,
"app_version refers to nonexistent file: %s\n",
file_ref.file_name
);
return 1;
}
// any file associated with an app version must be signed
//
fip->signature_required = true;
avp->app_files[i].file_info = fip;
}
return 0;
}
int CLIENT_STATE::link_file_ref(PROJECT* p, FILE_REF* file_refp) {
FILE_INFO* fip;
fip = lookup_file_info(p, file_refp->file_name);
if (!fip) {
fprintf(stderr,
"I/O desc links to nonexistent file: %s\n", file_refp->file_name
);
return 1;
}
file_refp->file_info = fip;
return 0;
}
int CLIENT_STATE::link_workunit(PROJECT* p, WORKUNIT* wup) {
APP* app;
APP_VERSION* avp;
unsigned int i;
int retval;
app = lookup_app(p, wup->app_name);
if (!app) {
fprintf(stderr,
"WU refers to nonexistent app: %s\n", wup->app_name
);
return 1;
}
avp = lookup_app_version(app, wup->version_num);
if (!avp) {
fprintf(stderr,
"WU refers to nonexistent app_version: %s %d\n",
wup->app_name, wup->version_num
);
return 1;
}
wup->project = p;
wup->app = app;
wup->avp = avp;
for (i=0; i<wup->input_files.size(); i++) {
retval = link_file_ref(p, &wup->input_files[i]);
if (retval) return retval;
}
return 0;
}
int CLIENT_STATE::link_result(PROJECT* p, RESULT* rp) {
WORKUNIT* wup;
unsigned int i;
int retval;
wup = lookup_workunit(p, rp->wu_name);
if (!wup) {
fprintf(stderr, "result refers to nonexistent WU: %s\n", rp->wu_name);
return 1;
}
rp->project = p;
rp->wup = wup;
rp->app = wup->app;
for (i=0; i<rp->output_files.size(); i++) {
retval = link_file_ref(p, &rp->output_files[i]);
if (retval) {
fprintf(stderr, "error: link_result: link_file_ref failed\n");
return retval;
}
}
return 0;
}
int CLIENT_STATE::latest_version_num(char* app_name) {
unsigned int i;
int best = -1;
APP_VERSION* avp;
for (i=0; i<app_versions.size(); i++) {
avp = app_versions[i];
if (strcmp(avp->app_name, app_name)) continue;
if (avp->version_num < best) continue;
best = avp->version_num;
}
if (best < 0) fprintf(stderr, "CLIENT_STATE::latest_version_num: no version\n");
return best;
}
// Print debugging information about how many projects/files/etc
// are currently in the client state record
//
void CLIENT_STATE::print_counts() {
if (log_flags.state_debug) {
printf(
"Client state file:\n"
"%d projects\n"
"%d file_infos\n"
"%d app_versions\n"
"%d workunits\n"
"%d results\n",
(int)projects.size(),
(int)file_infos.size(),
(int)app_versions.size(),
(int)workunits.size(),
(int)results.size()
);
}
}
// delete unneeded records and files
//
bool CLIENT_STATE::garbage_collect() {
unsigned int i;
int fail_num;
FILE_INFO* fip;
RESULT* rp;
WORKUNIT* wup;
vector<RESULT*>::iterator result_iter;
vector<WORKUNIT*>::iterator wu_iter;
vector<FILE_INFO*>::iterator fi_iter;
bool action = false;
// zero references counts on WUs and FILE_INFOs
for (i=0; i<workunits.size(); i++) {
wup = workunits[i];
wup->ref_cnt = 0;
}
for (i=0; i<file_infos.size(); i++) {
fip = file_infos[i];
fip->ref_cnt = 0;
}
// delete RESULTs that have been finished and reported;
// reference-count files referred to by other results
//
result_iter = results.begin();
while (result_iter != results.end()) {
rp = *result_iter;
if (rp->state == RESULT_SERVER_ACK) {
if (log_flags.state_debug) printf("deleting result %s\n", rp->name);
delete rp;
result_iter = results.erase(result_iter);
action = true;
} else {
// See if the files for this result's workunit had
// any errors (MD5, RSA, etc)
fail_num = rp->wup->had_failure();
if (fail_num) {
rp->exit_status = fail_num;
if (rp->state < RESULT_READY_TO_ACK) {
rp->state = RESULT_READY_TO_ACK;
}
} else {
rp->wup->ref_cnt++;
}
for (i=0; i<rp->output_files.size(); i++) {
// If one of the file infos had a failure,
// mark the result as done and report the error.
// The result, workunits, and file infos
// will be cleaned up after the server is notified
//
fail_num = rp->output_files[i].file_info->had_failure();
if (fail_num) {
rp->exit_status = fail_num;
if (rp->state < RESULT_READY_TO_ACK) {
rp->state = RESULT_READY_TO_ACK;
}
} else {
rp->output_files[i].file_info->ref_cnt++;
}
}
result_iter++;
}
}
// delete WORKUNITs not referenced by any result;
// reference-count files referred to by other WUs
//
wu_iter = workunits.begin();
while (wu_iter != workunits.end()) {
wup = *wu_iter;
if (wup->ref_cnt == 0) {
if (log_flags.state_debug) {
printf("deleting workunit %s\n", wup->name);
}
delete wup;
wu_iter = workunits.erase(wu_iter);
action = true;
} else {
for (i=0; i<wup->input_files.size(); i++) {
wup->input_files[i].file_info->ref_cnt++;
}
wu_iter++;
}
}
// delete FILE_INFOs (and corresponding files)
// that are not referenced by any WORKUNIT or RESULT,
// and are not sticky.
//
fi_iter = file_infos.begin();
while (fi_iter != file_infos.end()) {
fip = *fi_iter;
if (fip->ref_cnt==0 && !fip->sticky && !fip->executable) {
fip->delete_file();
if (log_flags.state_debug) printf("deleting file %s\n", fip->name);
delete fip;
fi_iter = file_infos.erase(fi_iter);
action = true;
} else {
fi_iter++;
}
}
// TODO: delete obsolete APP_VERSIONs
if (log_flags.state_debug && action) printf("garbage_collect\n");
return action;
}
// update the state of results
//
bool CLIENT_STATE::update_results() {
RESULT* rp;
vector<RESULT*>::iterator result_iter;
bool action = false;
// delete RESULTs that have been finished and reported;
// reference-count files referred to by other results
//
result_iter = results.begin();
while (result_iter != results.end()) {
rp = *result_iter;
switch (rp->state) {
case RESULT_NEW:
if (input_files_available(rp)) {
rp->state = RESULT_FILES_DOWNLOADED;
action = true;
}
break;
case RESULT_FILES_DOWNLOADED:
// The transition to COMPUTE_DONE is performed
// in app_finished()
break;
case RESULT_COMPUTE_DONE:
// Once the computation has been done, check
// that the necessary files have been uploaded
// before moving on
if (rp->is_upload_done()) {
rp->state = RESULT_READY_TO_ACK;
action = true;
}
break;
case RESULT_READY_TO_ACK:
// The transition to SERVER_ACK is performed in
// handle_scheduler_reply()
break;
case RESULT_SERVER_ACK:
// The result has been received by the scheduling
// server. It will be deleted on the next
// garbage collection, which we trigger by
// setting action to true
action = true;
break;
}
result_iter++;
}
return action;
}
// Parse the command line arguments passed to the client
//
void CLIENT_STATE::parse_cmdline(int argc, char** argv) {
int i;
for (i=1; i<argc; i++) {
if (!strcmp(argv[i], "-exit_when_idle")) {
exit_when_idle = true;
continue;
}
if (!strcmp(argv[i], "-no_time_test")) {
run_time_test = false;
continue;
};
if (!strcmp(argv[i], "-exit_after")) {
exit_after = atoi(argv[++i]);
continue;
};
// Give up on file transfers after x seconds. Default value is 1209600 (2 weeks)
if (!strcmp(argv[i], "-giveup_after")) {
giveup_after = atoi(argv[++i]);
continue;
};
if (!strcmp(argv[i], "-limit_transfer_rate")) {
max_transfer_rate = atoi(argv[++i]);
continue;
};
}
}
// Returns true if the core client should exit
//
bool CLIENT_STATE::time_to_exit() {
if (!exit_when_idle && (exit_after == -1)) return false;
if ((exit_after != -1) && app_started &&
(difftime(time(0), app_started) >= exit_after)) {
printf("exiting because time is up: %d\n", exit_after);
return true;
}
if (exit_when_idle && (results.size() == 0) && contacted_sched_server) {
printf("exiting because no more results\n");
return true;
}
return false;
}
void CLIENT_STATE::set_client_state_dirty(char* source) {
if (log_flags.state_debug) {
printf("set dirty: %s\n", source);
}
client_state_dirty = true;
}
// Report error back to project, setting result state to finished and backing
// off on the project. The error will appear in the stderr_out field of
// the result
//
int CLIENT_STATE::report_project_error( RESULT &res, int err_num, char *err_msg ) {
char total_err[256];
res.state = RESULT_READY_TO_ACK;
scheduler_op->backoff(res.project,"");
sprintf( total_err, "BOINC Core Client: Err %d: %s\n", err_num, err_msg );
if( strlen(res.stderr_out)+strlen(total_err) < STDERR_MAX_LEN ) {
strcat( res.stderr_out, total_err );
}
return 0;
}
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