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evloop_BM.c
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evloop_BM.c
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// file evloop_BM.c - event loop of BISMON
// SPDX-License-Identifier: GPL-3.0-or-later
/***
BISMON
Copyright © 2018 - 2022 CEA (Commissariat à l'énergie atomique et aux énergies alternatives)
contributed by Basile Starynkevitch (working at CEA, LIST, France)
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 3 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, see <http://www.gnu.org/licenses/>.
***/
#define _GNU_SOURCE 1
#include <stdio.h>
#include <stdarg.h>
#include <syslog.h>
#include <sys/socket.h>
#include <sys/un.h>
#include "bismon.h"
#include "evloop_BM.const.h"
//////////////////////////////////////////////////////////////////////////
/// An array describing the currently running child processes (e.g. GCC
/// compilations, printing processes, etc...). Stuff is removed from
/// that array only by plain_event_loop_BM which would also apply the
/// closures. Related to the queue of pending commands,
/// pendingrunproc_list_BM and to our queue_process_BM function.
struct processdescr_stBM running_process_descr_arr_BM[MAXNBWORKJOBS_BM + 1];
/// queued process commands, of nodes (dir, cmd, clos); for processes
/// which are not yet in the array above... so they are not yet running.
struct listtop_stBM *pendingrunproc_list_BM;
// lock for the structures above (both running_process_descr_arr_BM & pendingrunproc_list_BM)
pthread_mutex_t pendingrunproc_mtx_BM = PTHREAD_MUTEX_INITIALIZER;
volatile atomic_bool eventlooprunning_BM;
static volatile atomic_int count_dump_sigusr1_BM;
/// a mutex protecting the JSONRPC services...
pthread_mutex_t unix_json_mtx_BM = PTHREAD_MUTEX_INITIALIZER;
int master_unix_json_socket_fd_BM = -1;
volatile atomic_int nb_slave_json_sockets_BM; /// actual number of slave JSON sockets
/// each active socket has an object of payload
/// jsonrpcservicedata_stBM.
objectval_tyBM *unix_json_procobarr[MAXNBWORKJOBS_BM + 2];
void handle_master_unix_json_connection_BM (struct stackframe_stBM *);
// the lock above should be set when calling:
void
fork_process_at_slot_BM (int slotpos,
const stringval_tyBM * dirstrarg,
const node_tyBM * cmdnodarg,
const closure_tyBM * endclosarg,
struct stackframe_stBM *stkf);
void lock_runproc_mtx_at_BM (int lineno);
void unlock_runproc_mtx_at_BM (int lineno);
void plain_event_loop_BM (void);
// Handle signals thu signalfd(2); return true to break
// plain_event_loop_BM and stop the loop there. To continue the
// event loop, it should return false.
bool read_sigfd_BM (void);
// handle SIGCHLD
void handle_sigchld_BM (pid_t pid);
// handle the command pipe
void read_commandpipe_BM (void);
// the command pipe contains bytes, each considered as a different message
int cmdpipe_rd_BM = -1, cmdpipe_wr_BM = -1;
#define MAXTIMER_SECONDS_BM 0.5
enum cmd_charcode_enBM
{
cmdcod__none_bm = 0,
cmdcod_execdefer_bm = 'X',
cmdcod_rungc_bm = 'G',
};
void
create_commandpipe_BM (void)
{
int piparr[2] = { -1, -1 };
if (pipe2 (piparr, O_CLOEXEC | O_NONBLOCK))
FATAL_BM ("create_commandpipe_BM failure for the command pipe - %m");
cmdpipe_rd_BM = piparr[0];
cmdpipe_wr_BM = piparr[1];
DBGPRINTF_BM ("create_commandpipe_BM cmdpiprd#%d cmdpipwr#%d",
cmdpipe_rd_BM, cmdpipe_wr_BM);
} /* end create_commandpipe_BM */
void
read_commandpipe_BM (void)
{
#define NANOSECONDS_PER_SECOND_bm (1000*1000*1000)
extern bool did_deferred_BM (void);
char buf[4];
memset (&buf, 0, sizeof (buf));
int nbr = read (cmdpipe_rd_BM, buf, 1);
if (nbr == 1)
{
DBGPRINTF_BM ("read_commandpipe_BM '%s'", buf);
switch (buf[0])
{
// if buf[0] is 'X', execute a deferred command
case cmdcod_execdefer_bm: // 'X'
if (!did_deferred_BM ())
WARNPRINTF_BM ("read_commandpipe_BM failed to do deferred");
return;
case cmdcod_rungc_bm: // 'G'
// if buf[0] is 'G', run the garbage collector. Not sure!
garbage_collect_if_wanted_BM (NULL);
return;
default:
/// this should not happen....
WARNPRINTF_BM ("read_commandpipe_BM '%s' unknown", buf);
backtrace_print_BM ((struct backtrace_state *)
backtracestate_BM, 0, stdout);
printf ("%s:%d: unexpected command %s\n", __FILE__, __LINE__, buf);
fflush (stdout);
}
// should handle the command
}
else
DBGPRINTF_BM ("read_commandpipe_BM nbr %d - %s", nbr,
(nbr < 0) ? strerror (errno) : "--");
} /* end read_commandpipe_BM */
/// this function should return true to continue the loop in plain_event_loop_BM
bool
read_sigfd_BM (void) // called from plain_event_loop_BM
{
struct signalfd_siginfo siginf;
memset (&siginf, 0, sizeof (siginf));
time_t nowt = 0;
time (&nowt);
char nowbuf[48];
memset (nowbuf, 0, sizeof (nowbuf));
const char *nowstr = ctime_r (&nowt, nowbuf);
if (!nowstr)
nowstr = "????";
DBGPRINTF_BM ("read_sigfd_BM start sigfd_BM %d elapsed %3.f s at %s",
sigfd_BM, elapsedtime_BM (), nowstr);
int nbr = read (sigfd_BM, &siginf, sizeof (siginf));
if (nbr != sizeof (siginf)) // very unlikely, probably impossible
FATAL_BM ("read_sigfd_BM: read fail (%d bytes read, want %d) - %m",
nbr, (int) sizeof (siginf));
DBGPRINTF_BM ("read_sigfd_BM signo=%d at %s", siginf.ssi_signo, nowstr);
// TODO: is this read_sigfd_BM incomplete?
switch (siginf.ssi_signo)
{
case SIGUSR1:
{
if (!sigusr1_dump_prefix_BM)
{
WARNPRINTF_BM
("got SIGUSR1 at %s but without any --sigusr1-dump-prefix option",
nowstr);
goto terminating_dump;
};
ASSERT_BM (sigusr1_dump_prefix_BM != (const char *) 0);
int dumpcnt = 1 + atomic_fetch_add (&count_dump_sigusr1_BM, 1);
DBGPRINTF_BM ("read_sigfd_BM got SIGUSR1 at %s for dumping count %d",
nowstr, dumpcnt);
char dirbufname[MAXLEN_SIGUSR1_DUMP_PREFIX_BM + 8];
memset (dirbufname, 0, sizeof (dirbufname));
snprintf (dirbufname, sizeof (dirbufname), "%s%03d",
sigusr1_dump_prefix_BM, dumpcnt);
ASSERT_BM (strlen (dirbufname) < sizeof (dirbufname) - 2);
if (mkdir (dirbufname, S_IRWXU /* u+rwx */ ))
FATAL_BM ("failed to mkdir %s for SIGUSR1 dump - %m", dirbufname);
agenda_suspend_for_gc_BM ();
struct dumpinfo_stBM di = dump_BM (dirbufname, NULL);
{
char infopath[MAXLEN_SIGUSR1_DUMP_PREFIX_BM + 32];
memset (infopath, 0, sizeof (infopath));
snprintf (infopath, sizeof (infopath), "%s/BismonInfo", dirbufname);
FILE *infofil = fopen (infopath, "w");
if (infofil)
{
fprintf (infofil,
"# emitted %s Bismon intermediate dump file\n",
infopath);
fprintf (infofil, "BISMON_PID=%d\n", (int) getpid ());
fprintf (infofil, "BISMON_DIRDUMP='%s'\n", dirbufname);
fprintf (infofil, "BISMON_DUMPCOUNT=%d\n", dumpcnt);
fprintf (infofil, "BISMON_HOST='%s'\n", myhostname_BM);
fprintf (infofil, "BISMON_CHECKSUM='%s'\n", bismon_checksum);
fprintf (infofil, "BISMON_SHORTGITID='%s'\n",
bismon_shortgitid);
fprintf (infofil, "BISMON_TIMESTAMP='%s'\n", bismon_timestamp);
fprintf (infofil, "BISMON_TIMELONG=%ld\n", bismon_timelong);
fprintf (infofil, "BISMON_DIRECTORY='%s'\n", bismon_directory);
fflush (infofil);
fsync (fileno (infofil));
fclose (infofil);
}
}
INFOPRINTF_BM
("after dumping intermediate state into %s for SIGUSR1: scanned %ld, emitted %ld objects\n"
"did %ld todos, wrote %ld files\n"
"in %.3f elapsed, %.4f cpu seconds.\n", dirbufname,
di.dumpinfo_scanedobjectcount, di.dumpinfo_emittedobjectcount,
di.dumpinfo_todocount, di.dumpinfo_wrotefilecount,
di.dumpinfo_elapsedtime, di.dumpinfo_cputime);
backtrace_print_BM ((struct backtrace_state *)
backtracestate_BM, 0, stdout);
agenda_continue_after_gc_BM ();
};
return false;
case SIGUSR2: /* toggle debug */
if (showdebugmsg_BM)
{
DBGPRINTF_BM
("debugging output suspended by SIGUSR2 at %s; send again the same signal to reenable it",
nowstr);
showdebugmsg_BM = false;
INFOPRINTF_BM
("no more debugging output at %s (bismon pid %d on %s) since SIGUSR2 signal recieved",
nowstr, (int) getpid (), myhostname_BM);
}
else
{
INFOPRINTF_BM
("enabling debugging output at %s (bismon pid %d on %s) since SIGUSR2 signal recieved",
nowstr, (int) getpid (), myhostname_BM);
showdebugmsg_BM = true;
DBGPRINTF_BM
("debugging output enabled by SIGUSR2 at %s (bismon pid %d on %s); send again the same signal to disable it",
nowstr, (int) getpid (), myhostname_BM);
}
return true;
case SIGTERM:
case SIGINT:
terminating_dump:
{
DBGPRINTF_BM ("read_sigfd_BM got %s at %s",
strsignal (siginf.ssi_signo), nowstr);
stop_agenda_work_threads_BM ();
/// forcibly remove the payload of the_web_sessions. Its payload
/// should not be dumped, because of its class, but anyway...
{
objlock_BM (BMP_the_web_sessions);
objclearpayload_BM (BMP_the_web_sessions);
objunlock_BM (BMP_the_web_sessions);
}
char *rp = realpath (dump_dir_BM ? : ".", NULL);
INFOPRINTF_BM
("before dumping final state into %s (really %s) after signal %s to process %d, elapsed %.3f s",
dump_dir_BM, rp,
strsignal (siginf.ssi_signo), (int) getpid (), elapsedtime_BM ());
free (rp), rp = NULL;
backtrace_print_BM ((struct backtrace_state *)
backtracestate_BM, 0, stdout);
struct dumpinfo_stBM di = dump_BM (dump_dir_BM, NULL);
INFOPRINTF_BM
("after dumping final state into %s for SIGTERM: scanned %ld, emitted %ld objects\n"
"did %ld todos, wrote %ld files\n"
"in %.3f elapsed, %.4f cpu seconds.\n", dump_dir_BM,
di.dumpinfo_scanedobjectcount, di.dumpinfo_emittedobjectcount,
di.dumpinfo_todocount, di.dumpinfo_wrotefilecount,
di.dumpinfo_elapsedtime, di.dumpinfo_cputime);
}
return true;
case SIGQUIT:
INFOPRINTF_BM
("terminating without dump after SIGQUIT to process %d, elapsed %.3f s",
(int) getpid (), elapsedtime_BM ());
return true;
case SIGCHLD:
{
pid_t pid = siginf.ssi_pid;
if (showdebugmsg_BM)
{
char exebuf[64];
char pathbuf[64];
memset (exebuf, 0, sizeof (exebuf));
memset (pathbuf, 0, sizeof (pathbuf));
snprintf (pathbuf, sizeof (pathbuf), "/proc/%d/exe", pid);
if (readlink (pathbuf, exebuf, sizeof (exebuf) - 1) < 0)
FATAL_BM ("readlink %s failed (%m)", pathbuf);
DBGPRINTF_BM ("read_sigfd_BM got SIGCHLD pid=%d (%s)", (int) pid,
exebuf);
}
handle_sigchld_BM (pid);
return false;
}
default:
FATAL_BM ("read_sigfd_BM unexpected signo %d", siginf.ssi_signo);
};
DBGPRINTF_BM ("read_sigfd_BM ending");
return false;
} /* end read_sigfd_BM */
void
handle_sigchld_BM (pid_t pid)
{
objectval_tyBM *k_queue_process = BMK_8DQ4VQ1FTfe_5oijDYr52Pb;
bool didfork = false;
LOCALFRAME_BM ( /*prev: */ NULL, /*descr: */ NULL,
/// for the terminating child process
value_tyBM chdirstrv; //
value_tyBM chcmdnodv; //
value_tyBM chclosv; //
objectval_tyBM * chbufob; //
value_tyBM choutstrv; //
// for queued commands
value_tyBM qnodv; //
value_tyBM newdirstrv; //
value_tyBM newcmdnodv; //
value_tyBM newendclosv; //
);
DBGPRINTF_BM ("handle_sigchld_BM start pid=%d", (int) pid);
int wstatus = 0;
pid_t wpid = waitpid (pid, &wstatus, WNOHANG);
if (wpid == pid)
{
DBGPRINTF_BM ("handle_sigchld_BM pid %d", (int) pid);
{
int chix = -1;
int nbruncmds = 0;
lock_runproc_mtx_at_BM (__LINE__);
for (int oix = 0; oix < MAXNBWORKJOBS_BM; oix++)
{
struct processdescr_stBM *runproc =
running_process_descr_arr_BM + oix;
if (!runproc->rp_pid)
continue;
nbruncmds++;
if (runproc->rp_pid == pid)
{
ASSERT_BM (chix < 0);
chix = oix;
_.chdirstrv = (value_tyBM) runproc->rp_dirstrv;
_.chcmdnodv = (value_tyBM) runproc->rp_cmdnodv;
_.chclosv = (value_tyBM) runproc->rp_closv;
_.chbufob = (value_tyBM) runproc->rp_bufob;
memset ((void *) runproc, 0,
sizeof (struct processdescr_stBM));
}
}
_.qnodv =
(value_tyBM) nodecast_BM (listfirst_BM (pendingrunproc_list_BM));
if (_.qnodv)
{
ASSERT_BM (nodeconn_BM (_.qnodv) == k_queue_process);
if (nbruncmds <= nbworkjobs_BM)
{
listpopfirst_BM (pendingrunproc_list_BM);
_.newdirstrv = (value_tyBM)
stringcast_BM ((value_tyBM) nodenthson_BM (_.qnodv, 0));
_.newcmdnodv = (value_tyBM)
nodecast_BM ((value_tyBM) nodenthson_BM (_.qnodv, 1));
_.newendclosv = (value_tyBM)
nodecast_BM ((value_tyBM) nodenthson_BM (_.qnodv, 2));
ASSERT_BM (isnode_BM (_.newcmdnodv));
ASSERT_BM (isclosure_BM (_.newendclosv));
DBGPRINTF_BM
("handle_sigchld_BM chix#%d newdirstrv %s newcmdnodv %s newendclosv %s beforefork",
chix, debug_outstr_value_BM (_.newdirstrv, CURFRAME_BM,
0),
debug_outstr_value_BM (_.newcmdnodv, CURFRAME_BM, 0),
debug_outstr_value_BM (_.newendclosv, CURFRAME_BM, 0));
fork_process_at_slot_BM (chix, _.newdirstrv,
_.newcmdnodv, _.newendclosv,
CURFRAME_BM);
didfork = true;
}
}
unlock_runproc_mtx_at_BM (__LINE__);
if (chix >= 0)
{
_.choutstrv =
(value_tyBM)
makestring_BM (objstrbufferbytespayl_BM (_.chbufob));
DBGPRINTF_BM
("handle_sigchld_BM defer-apply chclosv %s choutstrv %s wstatus %#x=%d",
debug_outstr_value_BM (_.chclosv, CURFRAME_BM, 0),
debug_outstr_value_BM (_.choutstrv, CURFRAME_BM, 0), wstatus,
wstatus);
do_main_defer_apply3_BM (_.chclosv, _.choutstrv,
taggedint_BM (wstatus), NULL,
CURFRAME_BM);
}
}
}
else
{
DBGPRINTF_BM ("handle_sigchld_BM pid%d wpid%d", (int) pid, (int) wpid);
char pidbuf[128];
memset (pidbuf, 0, sizeof (pidbuf));
snprintf (pidbuf, sizeof (pidbuf), "/proc/%d/cmdline", (int) pid);
FILE *cmdf = fopen (pidbuf, "r");
if (cmdf)
{
size_t ln = fread (pidbuf, sizeof (pidbuf) - 1, 1, cmdf);
if (ln > 0)
{
pidbuf[ln] = (char) 0;
for (int ix = 0; ix < (int) ln; ix++)
if (pidbuf[ix] == 0)
pidbuf[ix] = ' ';
}
else
strcpy (pidbuf, "??");
fclose (cmdf);
}
else
{
char exepidbuf[64];
memset (pidbuf, 0, sizeof (pidbuf));
memset (exepidbuf, 0, sizeof (exepidbuf));
snprintf (exepidbuf, sizeof (exepidbuf), "/proc/%u/exe",
(unsigned) pid);
if (readlink (exepidbuf, pidbuf, sizeof (pidbuf) - 1) < 0)
FATAL_BM ("readlink %s failed (%m)", exepidbuf);
}
WARNPRINTF_BM
("handle_sigchld_BM waitpid failure pid#%d '%s' status#%d", pid,
pidbuf, wstatus);
WEAKASSERTWARN_BM ("handle_sigchld_BM failed" && false);
}
if (didfork)
usleep (1000); // sleep a little bit, to let the child process start
} /* end handle_sigchld_BM */
void
lock_runproc_mtx_at_BM (int lineno __attribute__((unused)))
{
#if 0
// too verbose, so not needed
DBGPRINTFAT_BM (__FILE__, lineno, "lock_runproc_mtx_BM thrid=%ld",
(long) gettid_BM ());
#endif
pthread_mutex_lock (&pendingrunproc_mtx_BM);
} /* end lock_runproc_mtx_at_BM */
void
unlock_runproc_mtx_at_BM (int lineno __attribute__((unused)))
{
#if 0
// too verbose, so not needed
DBGPRINTFAT_BM (__FILE__, lineno, "unlock_runproc_mtx_BM thrid=%ld",
(long) gettid_BM ());
#endif
pthread_mutex_unlock (&pendingrunproc_mtx_BM);
} /* end unlock_runproc_mtx_at_BM */
void
add_defer_command_BM (void)
{
char buf[4];
memset (&buf, 0, sizeof (buf));
buf[0] = cmdcod_execdefer_bm /* 'X' */ ;
int count = 0;
while (count < 256)
{ /* this loop usually runs once */
int nbw = write (cmdpipe_wr_BM, buf, 1);
if (nbw < 0 && errno == EINTR)
continue;
if (nbw < 0 && errno == EWOULDBLOCK)
{
usleep (2000);
continue;
};
if (nbw == 1)
return;
FATAL_BM ("add_defer_command_BM nbw %d - %s", nbw,
(nbw < 0) ? strerror (errno) : "--");
}
FATAL_BM ("add_defer_command_BM failed");
} /* end add_defer_command_BM */
void
add_rungarbcoll_command_BM (void)
{
char buf[4];
memset (&buf, 0, sizeof (buf));
DBGBACKTRACEPRINTF_BM ("add_rungarbcoll_command_BM");
buf[0] = cmdcod_rungc_bm; /* 'G' */
int count = 0;
if (cmdpipe_wr_BM > 0)
{
while (count < 256)
{ /* this loop usually runs once */
int nbw = write (cmdpipe_wr_BM, buf, 1);
if (nbw < 0 && errno == EINTR)
continue;
if (nbw < 0 && errno == EWOULDBLOCK)
{
usleep (2000);
continue;
};
if (nbw == 1)
return;
FATAL_BM ("add_rungarbcoll_command_BM nbw %d - %s", nbw,
(nbw < 0) ? strerror (errno) : "--");
}
}
else
{
WARNPRINTF_BM ("add_rungarbcoll_command_BM no cmdpipe");
backtrace_print_BM ((struct backtrace_state *)
backtracestate_BM, 0, stderr);
fflush (stderr);
request_delayed_garbage_collection_BM ();
}
} /* end add_rungarbcoll_command_BM */
// queue some external process; its stdin is /dev/null; both stdout &
// stderr are merged & captured; final string is given to the closure.
// dirstrv is the string of the directory to run it in (if NULL, use
// cwd) cmdnodv is a node with all sons being strings, for the command
// to run endclosv is the closure getting the status
// stringoutput, could fail
void
queue_process_BM (const stringval_tyBM * dirstrarg,
const node_tyBM * cmdnodarg,
const closure_tyBM * endclosarg,
struct stackframe_stBM *stkf)
{
objectval_tyBM *k_queue_process = BMK_8DQ4VQ1FTfe_5oijDYr52Pb;
//objectval_tyBM *k_sbuf_object = BMK_77xbaw1emfK_1nhE4tp0bF3;
LOCALFRAME_BM ( /*prev: */ stkf, /*descr: */ k_queue_process, //
const stringval_tyBM * dirstrv; //
const node_tyBM * cmdnodv; //
const closure_tyBM * endclosv; //
value_tyBM curargv; //
value_tyBM errorv; //
value_tyBM causev; //
objectval_tyBM * bufob; //
value_tyBM nodv; //
);
_.dirstrv = dirstrarg;
_.cmdnodv = cmdnodarg;
_.endclosv = endclosarg;
bool lockedproc = false;
int failin = -1;
#define FAILHERE(Cause) do { failin = __LINE__ ; _.causev = (value_tyBM)(Cause); goto failure; } while(0)
if (_.dirstrv && !isstring_BM ((value_tyBM) _.dirstrv))
FAILHERE (makenode1_BM (BMP_string, (value_tyBM) _.dirstrv));
if (_.dirstrv && isstring_BM ((value_tyBM) _.dirstrv))
{
struct stat dirstat;
int olderrno = errno;
errno = 0;
memset (&dirstat, 0, sizeof (dirstat));
if (!stat (bytstring_BM (_.dirstrv), &dirstat)
&& (dirstat.st_mode & S_IFMT) != S_IFDIR)
errno = ENOTDIR;
int newerrno = errno;
errno = olderrno;
if (newerrno)
FAILHERE (makenode2_BM
(BMP_node, (value_tyBM) _.dirstrv,
taggedint_BM (newerrno)));
}
if (!isnode_BM ((value_tyBM) _.cmdnodv))
FAILHERE (makenode1_BM (BMP_node, (value_tyBM) _.cmdnodv));
if (!isclosure_BM ((value_tyBM) _.endclosv))
FAILHERE (makenode1_BM (BMP_closure, (value_tyBM) _.cmdnodv));
unsigned cmdlen = nodewidth_BM ((value_tyBM) _.cmdnodv);
if (cmdlen == 0)
FAILHERE (makenode1_BM (BMP_node, (value_tyBM) _.cmdnodv));
for (unsigned aix = 0; aix < cmdlen; aix++)
{
_.curargv = nodenthson_BM ((value_tyBM) _.cmdnodv, aix);
if (!isstring_BM (_.curargv))
FAILHERE (makenode2_BM
(BMP_node, (value_tyBM) _.cmdnodv, taggedint_BM (aix)));
}
ASSERT_BM (nbworkjobs_BM >= MINNBWORKJOBS_BM
&& nbworkjobs_BM <= MAXNBWORKJOBS_BM);
{
lock_runproc_mtx_at_BM (__LINE__);
lockedproc = true;
int slotpos = -1;
for (int ix = 0; ix < nbworkjobs_BM; ix++)
{
if (running_process_descr_arr_BM[ix].rp_pid == 0)
{
slotpos = ix;
break;
};
}
if (slotpos >= 0 && !pendingrunproc_list_BM)
{
fork_process_at_slot_BM (slotpos, _.dirstrv, _.cmdnodv,
_.endclosv, CURFRAME_BM);
}
else
{ // append to pendingrunproc_list_BM
if (!pendingrunproc_list_BM)
pendingrunproc_list_BM = makelist_BM ();
_.nodv = (value_tyBM)
makenode3_BM (k_queue_process, (value_tyBM) _.dirstrv,
(value_tyBM) _.cmdnodv, (value_tyBM) _.endclosv);
listappend_BM (pendingrunproc_list_BM, _.nodv);
}
ASSERT_BM (lockedproc);
unlock_runproc_mtx_at_BM (__LINE__), lockedproc = false;
}
LOCALJUSTRETURN_BM ();
failure:
#undef FAILHERE
if (lockedproc)
unlock_runproc_mtx_at_BM (__LINE__), lockedproc = false;
DBGPRINTF_BM
("queue_process failure failin %d dirstr %s, cmdnod %s endclos %s, cause %s",
failin,
bytstring_BM (_.dirstrv), debug_outstr_value_BM ((value_tyBM) _.cmdnodv,
CURFRAME_BM, 0),
debug_outstr_value_BM ((value_tyBM) _.endclosv, CURFRAME_BM, 0),
debug_outstr_value_BM ((value_tyBM) _.causev, CURFRAME_BM, 0));
_.errorv = (value_tyBM) makenode4_BM (k_queue_process, (value_tyBM) _.dirstrv, (value_tyBM) _.cmdnodv, //
(value_tyBM) _.endclosv,
(value_tyBM) _.causev);
PLAINFAILURE_BM (failin, _.errorv, CURFRAME_BM);
} /* end queue_process_BM */
////////////////
void
fork_process_at_slot_BM (int slotpos,
const stringval_tyBM * dirstrarg,
const node_tyBM * cmdnodarg,
const closure_tyBM * endclosarg,
struct stackframe_stBM *stkf)
{
//objectval_tyBM *k_queue_process = BMK_8DQ4VQ1FTfe_5oijDYr52Pb;
//objectval_tyBM *k_sbuf_object = BMK_77xbaw1emfK_1nhE4tp0bF3;
LOCALFRAME_BM ( /*prev: */ stkf,
/*descr: */ NULL,
const stringval_tyBM * dirstrv; //
const node_tyBM * cmdnodv; //
const closure_tyBM * endclosv; //
value_tyBM curargv; //
objectval_tyBM * bufob; //
);
_.dirstrv = dirstrarg;
_.cmdnodv = cmdnodarg;
_.endclosv = endclosarg;
int cmdlen = nodewidth_BM ((value_tyBM) _.cmdnodv);
ASSERT_BM (cmdlen > 0);
ASSERT_BM (slotpos >= 0 && slotpos < MAXNBWORKJOBS_BM);
DBGPRINTF_BM ("fork_process_at_slot_BM slotpos %d cmdnod %s",
slotpos,
debug_outstr_value_BM ((value_tyBM) _.cmdnodv, CURFRAME_BM,
0));
/// should fork the process
int pipfd[2] = { -1, -1 };
const char **args = calloc (cmdlen + 1, sizeof (char *));
if (!args)
FATAL_BM ("calloc args %d failed - %m", cmdlen);
for (int aix = 0; aix < cmdlen; aix++)
args[aix] = bytstring_BM (nodenthson_BM ((value_tyBM) _.cmdnodv, aix));
if (pipe (pipfd))
FATAL_BM ("pipe failed - %m");
ASSERT_BM (pipfd[0] > 0 && pipfd[1] > 0);
fflush (NULL);
pid_t pid = fork ();
if (pid < 0)
FATAL_BM ("failed to fork %s - %m", args[0]);
if (pid == 0)
{
{
// child process;
sigset_t sigset = { };
sigemptyset (&sigset);
// restore default SIGTERM & SIGQUIT behavior
signal (SIGTERM, SIG_DFL);
signal (SIGQUIT, SIG_DFL);
signal (SIGCHLD, SIG_DFL);
sigaddset (&sigset, SIGTERM);
sigaddset (&sigset, SIGQUIT);
sigaddset (&sigset, SIGCHLD);
sigprocmask (SIG_UNBLOCK, &sigset, NULL);
sigfd_BM = -2;
}
//in principle, most file descriptors should be
//close-on-exec, but just in case we close some of them...
for (int ix = 3; ix < 64; ix++)
if (ix != pipfd[1])
(void) close (ix);
if (isstring_BM ((value_tyBM) _.dirstrv))
{
if (chdir (bytstring_BM (_.dirstrv)))
{
perror (bytstring_BM (_.dirstrv));
exit (126);
}
}
int fd = open ("/dev/null", O_RDONLY);
dup2 (fd, STDIN_FILENO);
close (fd), fd = -1;
dup2 (pipfd[1], STDOUT_FILENO);
dup2 (pipfd[1], STDERR_FILENO);
execv (args[0], (char *const *) args);
perror (args[0]);
_exit (127);
}
else
{ // parent process
struct processdescr_stBM *onproc =
running_process_descr_arr_BM + slotpos;
ASSERT_BM (onproc->rp_pid <= 0 && onproc->rp_outpipe <= 0);
onproc->rp_pid = pid;
onproc->rp_outpipe = pipfd[0];
fcntl (pipfd[0], F_SETFL, O_NONBLOCK);
onproc->rp_cmdnodv = _.cmdnodv;
onproc->rp_closv = _.endclosv;
onproc->rp_dirstrv = _.dirstrv;
_.bufob = makeobj_BM ();
onproc->rp_bufob = _.bufob;
}
} /* end fork_process_at_slot_BM */
/// remember that only plain_event_loop_BM is allowed to *remove*
/// things from running_process_descr_arr_BM or pendingrunproc_list_BM
void
plain_event_loop_BM (void) /// called from from main
{
// objectval_tyBM *k_plain_event_loop = BMK_74VNUG6Vqq4_700i8h0o8EI;
LOCALFRAME_BM ( /*prev: */ NULL, /*descr: */ NULL,
objectval_tyBM * bufob; objectval_tyBM * curjsob;
);
atomic_init (&eventlooprunning_BM, true);
DBGBACKTRACEPRINTF_BM ("plain_event_loop_BM before loop sigfd_BM=%d tid#%ld elapsed %.3f s", //
sigfd_BM, (long) gettid_BM (), elapsedtime_BM ());
long loopcnt = 0;
int masterixjs = -1;
INFOPRINTF_BM
("start loop of plain_event_loop_BM bismon pid %d git %s host %s\n",
(int) getpid (), bismon_shortgitid, myhostname_BM);
fflush (NULL);
while (atomic_load (&eventlooprunning_BM))
{
loopcnt++;
struct pollfd pollarr[MAXNBWORKJOBS_BM + 10];
pid_t endedprocarr[MAXNBWORKJOBS_BM + 2];
memset (pollarr, 0, sizeof (pollarr));
memset (endedprocarr, 0, sizeof (endedprocarr));
int nbpoll = 0;
enum
{ pollix_sigfd, // got a signalfd
pollix_cmdp, // the command pipe
pollix__last
};
pollarr[pollix_sigfd].fd = sigfd_BM;
pollarr[pollix_sigfd].events = POLL_IN;
pollarr[pollix_cmdp].fd = cmdpipe_rd_BM;
pollarr[pollix_cmdp].events = POLL_IN;
nbpoll = pollix__last;
{
lock_runproc_mtx_at_BM (__LINE__);
for (int j = 0; j < nbworkjobs_BM; j++)
if (running_process_descr_arr_BM[j].rp_pid > 0
&& running_process_descr_arr_BM[j].rp_outpipe > 0)
{
pollarr[nbpoll].fd = running_process_descr_arr_BM[j].rp_outpipe;
pollarr[nbpoll].events = POLL_IN;
nbpoll++;
}
unlock_runproc_mtx_at_BM (__LINE__);
}
if (master_unix_json_socket_fd_BM > 0)
{
pollarr[nbpoll].fd = master_unix_json_socket_fd_BM;
pollarr[nbpoll].events = POLL_IN;
masterixjs = nbpoll;
nbpoll++;
};
{
int firstjsonix = nbpoll;
pthread_mutex_lock (&unix_json_mtx_BM);
int nbjs = atomic_load (&nb_slave_json_sockets_BM);
if (nbjs > 0)
{
ASSERT_BM (nbjs <= MAXNBWORKJOBS_BM);
for (int jsix = 0; jsix < nbjs; jsix++)
{
_.curjsob = unix_json_procobarr[jsix];
ASSERT_BM (_.curjsob != NULL);
objlock_BM (_.curjsob);
extendedval_tyBM curjspayl = objpayload_BM (_.curjsob);
if (valtype_BM (curjspayl) == typayl_jsonrpcservice_BM)
{
struct jsonrpcservicedata_stBM *jsonrpcpayl = curjspayl;
ASSERT_BM (jsonrpcpayl->jsonrpcserv_magic ==
BISMON_JSONRPCSERV_MAGICNUM);
ASSERT_BM (nbpoll < (int)
(sizeof (pollarr) / sizeof (pollarr[0])));
if (!jsonrpcpayl->jsonrpcserv_buffer)
{
const int initsiz = 360;
jsonrpcpayl->jsonrpcserv_buffer = calloc (initsiz, 1);
if (!jsonrpcpayl->jsonrpcserv_buffer)
FATAL_BM
("plain_event_loop_BM fails to allocate jsonrpcserv_buffer of %d bytes (%m)",
initsiz);
jsonrpcpayl->jsonrpcserv_sizbuf = (unsigned) initsiz;
jsonrpcpayl->jsonrpcserv_buflen = 0;
};
pollarr[nbpoll].fd = jsonrpcpayl->jsonrpcserv_sockfd;
pollarr[nbpoll].events = POLL_IN;
nbpoll++;
}
objunlock_BM (_.curjsob);
}
};
pthread_mutex_unlock (&unix_json_mtx_BM);
}
//////////// POLLING BELOW
if (nbpoll >= (int) (sizeof (pollarr) / sizeof (pollarr[0])))
FATAL_BM ("too many %d file descriptors to poll loop#%ld", nbpoll,
loopcnt);
#define POLL_DELAY_MILLISECS_BM 3750
if (loopcnt % 4 == 0)
DBGPRINTF_BM
("plain_event_loop_BM before poll nbpoll=%d loop#%ld delay %d ms",
nbpoll, loopcnt, POLL_DELAY_MILLISECS_BM);
int nbready = poll (pollarr, nbpoll, POLL_DELAY_MILLISECS_BM);
if (loopcnt % 4 == 0)
DBGPRINTF_BM ("plain_event_loop_BM nbready %d loop#%ld", nbready,
loopcnt);
if (nbready == 0) // no file descriptor read, timed out
continue;
if (nbready < 0)
{
if (errno != EINTR)
FATAL_BM ("plain_event_loop_BM poll failure");
continue;
}
{
char pipbuf[1024 + 4];
memset (pipbuf, 0, sizeof (pipbuf) / 4);
lock_runproc_mtx_at_BM (__LINE__);
int runix = 0;
for (int ix = pollix__last; ix < nbpoll; ix++)
{
if (pollarr[ix].revents & POLL_IN)
{
int curfd = pollarr[ix].fd;
while (runix < nbworkjobs_BM)
{
if (running_process_descr_arr_BM[runix].rp_outpipe ==
curfd)
{
struct processdescr_stBM *onproc =
running_process_descr_arr_BM + runix;
runix++;
int bytcnt = 0;
do
{
memset (pipbuf, 0, sizeof (pipbuf));
// we might do ioctl(curfd, FIONBIO, &cnt)
// but it is not worth doing since the pipe
// is non-blocking. See https://stackoverflow.com/a/1151077/841108
bytcnt =
read (curfd, pipbuf, sizeof (pipbuf) - 4);
if (bytcnt < 0 && errno == EINTR)
continue;
if (bytcnt < 0 && errno == EWOULDBLOCK)
break;
if (bytcnt < 0)
{
// this probably should not happen
FATAL_BM
("unexpected error %m on output pipe fd#%d for pid %d",
curfd, (int) onproc->rp_pid);
}
if (bytcnt == 0)
{ // end of file on pipe
// the forked process might close its stdout
// and still be running, even if this is
// unfriendly...
close (curfd);
onproc->rp_outpipe = -1;
break;
}
ASSERT_BM (bytcnt > 0);
pipbuf[bytcnt] = (char) 0;
if ((int) strlen (pipbuf) < (int) bytcnt)
{
WARNPRINTF_BM
("unexpected null byte from process pid#%d command node %s in %s",
(int)
running_process_descr_arr_BM[runix].rp_pid,
OUTSTRVALUE_BM ((value_tyBM)
onproc->rp_cmdnodv),
bytstring_BM (onproc->rp_dirstrv) ? :
"./");
if (kill (onproc->rp_pid, SIGTERM) == 0)
WARNPRINTF_BM ("sent SIGTERM to pid#%d",
onproc->rp_pid);
close (curfd);
onproc->rp_outpipe = -1;
usleep (1000);
}
_.bufob = onproc->rp_bufob;
ASSERT_BM (isobject_BM (_.bufob));
ASSERT_BM (objhasstrbufferpayl_BM (_.bufob));
objstrbufferappendcstrpayl_BM (_.bufob, pipbuf);
_.bufob = NULL;
pipbuf[0] = (char) 0;
}
while (bytcnt > 0);
break;
}
}
}
_.bufob = NULL;
}
unlock_runproc_mtx_at_BM (__LINE__);
}
if (pollarr[pollix_sigfd].revents & POLL_IN)
{
DBGPRINTF_BM ("plain_event_loop sigfd readable");
bool stop = read_sigfd_BM ();
if (stop)
{
atomic_store (&eventlooprunning_BM, false);
DBGPRINTF_BM ("plain_event_loop sigfd stopping after sigfd");
break;
}
else
DBGPRINTF_BM ("plain_event_loop sigfd continuing after sigfd");
}
if (pollarr[pollix_cmdp].revents & POLL_IN)
read_commandpipe_BM ();
if (masterixjs > 0 && pollarr[masterixjs].revents & POLL_IN)
{
ASSERT_BM (pollarr[masterixjs].fd == master_unix_json_socket_fd_BM);
handle_master_unix_json_connection_BM ((struct stackframe_stBM *)
&_);
};
} /* end while eventlooprunning */
INFOPRINTF_BM ("plain_event_loop_BM ended loopcnt=%ld", loopcnt);
} /* end plain_event_loop_BM */
void
handle_master_unix_json_connection_BM (struct stackframe_stBM *stkf)
{
LOCALFRAME_BM ( /*prev: */ stkf, /*descr: */ NULL,
value_tyBM val);
union
{
struct sockaddr_un un_sockaddr;
char xtraspace[256];
} us;
ASSERT_BM (master_unix_json_socket_fd_BM > 0);
memset (&us, 0, sizeof (us));
socklen_t sa_len = sizeof (us) - sizeof (int);
int acceptedfd =
accept (master_unix_json_socket_fd_BM, &us.un_sockaddr, &sa_len);
DBGPRINTF_BM ("master unixjsonfd#%d acceptedfd#%d sockaddr '%s'",
master_unix_json_socket_fd_BM,
acceptedfd, us.un_sockaddr.sun_path);
if (acceptedfd > 0)
{
int nbs = atomic_fetch_add (&nb_slave_json_sockets_BM, 1);
if (nbs >= MAXNBWORKJOBS_BM || nbs >= nbworkjobs_BM + 1)
{