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/* This file is part of gacopyz.
Copyright (C) 2006-2025 Sergey Poznyakoff
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, 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/>. */
#include <gacopyz_priv.h>
static int cleanup_needed;
#define PIDTAB_INCR 256
int
gacopyz_register_child(gacopyz_conn_t conn, pid_t pid)
{
size_t i, newcount;
pid_t *p;
for (i = 0; i < conn->pidcount; i++)
if (conn->pidtab[i] == 0) {
conn->pidtab[i] = pid;
return 0;
}
newcount = conn->pidcount + PIDTAB_INCR;
p = realloc(conn->pidtab, newcount * sizeof(conn->pidtab[0]));
if (!p)
return 1;
memset(p + i, 0, PIDTAB_INCR * sizeof(conn->pidtab[0]));
conn->pidcount = newcount;
conn->pidtab = p;
conn->pidtab[i++] = pid;
return 0;
}
void
gacopyz_unregister_child(gacopyz_conn_t conn, pid_t pid)
{
size_t i;
for (i = 0; i < conn->pidcount; i++)
if (conn->pidtab[i] == pid)
conn->pidtab[i] = 0;
}
static void
print_status(gacopyz_conn_t conn, pid_t pid, int status, int expect_term)
{
if (WIFEXITED(status)) {
if (WEXITSTATUS(status) == 0) {
if (GACOPYZ_CONN_LOG_MATCH(conn, SMI_LOG_DEBUG))
gacopyz_log(SMI_LOG_DEBUG,
_("child %lu exited successfully"),
(unsigned long) pid);
} else {
if (GACOPYZ_CONN_LOG_MATCH(conn, SMI_LOG_ERR))
gacopyz_log(SMI_LOG_ERR,
_("child %lu failed with status %d"),
(unsigned long) pid,
WEXITSTATUS(status));
}
} else if (WIFSIGNALED(status)) {
int prio;
if (expect_term && WTERMSIG(status) == SIGTERM)
prio = SMI_LOG_DEBUG;
else
prio = SMI_LOG_ERR;
if (GACOPYZ_CONN_LOG_MATCH(conn, prio))
gacopyz_log(prio,
_("child %lu terminated on signal %d"),
(unsigned long) pid, WTERMSIG(status));
} else if (WIFSTOPPED(status)) {
if (GACOPYZ_CONN_LOG_MATCH(conn, SMI_LOG_ERR))
gacopyz_log(SMI_LOG_ERR,
_("child %lu stopped on signal %d"),
(unsigned long) pid, WSTOPSIG(status));
}
#ifdef WCOREDUMP
else if (WCOREDUMP(status)) {
if (GACOPYZ_CONN_LOG_MATCH(conn, SMI_LOG_ERR))
gacopyz_log(SMI_LOG_ERR,
_("child %lu dumped core"),
(unsigned long) pid);
}
#endif
else if (GACOPYZ_CONN_LOG_MATCH(conn, SMI_LOG_ERR))
gacopyz_log(SMI_LOG_ERR,
_("child %lu terminated with unrecognized status"),
(unsigned long) pid);
}
static void
cleanup_children(gacopyz_conn_t conn, int expect_term)
{
if (!cleanup_needed)
return;
for (;;) {
int status;
pid_t pid = waitpid((pid_t)-1, &status, WNOHANG);
if (pid <= 0)
break;
gacopyz_unregister_child(conn, pid);
print_status(conn, pid, status, expect_term);
}
cleanup_needed = 0;
}
void
gacopyz_cleanup_children(gacopyz_conn_t conn)
{
cleanup_children(conn, 0);
}
void
gacopyz_cleanup_conn(gacopyz_conn_t conn)
{
size_t i;
if (GACOPYZ_CONN_LOG_MATCH(conn, SMI_LOG_DEBUG))
gacopyz_log(SMI_LOG_DEBUG, _("terminating subprocesses"));
for (i = 0; i < conn->pidcount; i++)
if (conn->pidtab[i])
kill(conn->pidtab[i], SIGTERM);
cleanup_children(conn, 1);
if (conn->cleanup)
conn->cleanup(conn, conn->cleanup_data);
}
static void
sig_child(int sig)
{
cleanup_needed = 1;
signal(sig, sig_child);
}
void
gacopyz_setup_signals()
{
signal(SIGCHLD, sig_child);
signal(SIGPIPE, SIG_IGN); /* FIXME */
}
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