jehanne/sys/src/lib/posix/initlib.c

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/*
* This file is part of Jehanne.
*
* Copyright (C) 2017 Giacomo Tesio <giacomo@tesio.it>
*
* This is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, version 3 of the License.
*
* Jehanne 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 Affero General Public License
* along with Jehanne. If not, see <http://www.gnu.org/licenses/>.
*/
#include <u.h>
#include <lib9.h>
#include <posix.h>
#include "internal.h"
extern int *__libposix_errors_codes;
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extern WaitList **__libposix_wait_list;
extern ChildList **__libposix_child_list;
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static int __initialized;
static PosixProcessDisposer __libposix_process_dispose;
int *__libposix_sigchld_father_pid;
int *__libposix_sigchld_child_pid;
int *__libposix_devsignal;
int *__libposix_pid;
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static void
libposix_check_configuration(void)
{
__libposix_errors_check_conf();
__libposix_files_check_conf();
__libposix_processes_check_conf();
}
void
__libposix_sighelper_open(void)
{
int mypid;
if(*__libposix_devsignal >= 0)
close(*__libposix_devsignal);
mypid = *__libposix_pid;
*__libposix_devsignal = create("/dev/posix/signals", ORDWR|OCEXEC, mypid);
if(*__libposix_devsignal < 0)
sysfatal("cannot create /dev/posix/signals: %r");
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}
void
libposix_init(int argc, char *argv[], PosixInit init)
{
extern int main(int, char**);
extern int *__handling_external_signal;
extern int *__restart_syscall;
extern PosixSignalMask *__libposix_signal_mask;
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WaitList *wait_list;
ChildList *child_list;
PosixSignalMask signal_mask;
int mypid;
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int status;
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int error_codes[ERRNO_LAST-ERRNO_FIRST];
int handling_signal;
int sigchld_father_pid;
int sigchld_child_pid;
int restart_syscall;
int devsignal;
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assert(__initialized == 0);
mypid = getpid();
__libposix_pid = &mypid;
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/* initialize PosixErrors map */
memset(error_codes, 0, sizeof(error_codes));
__libposix_errors_codes = error_codes;
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/* initialize wait_list; see also POSIX_fork and POSIX_exit */
wait_list = nil;
__libposix_wait_list = &wait_list;
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/* initialize child_list; used when SIGCHLD is enabled */
child_list = nil;
__libposix_child_list = &child_list;
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/* initialize signal handling */
handling_signal = 0;
sigchld_father_pid = 0;
sigchld_child_pid = 0;
signal_mask = 0;
devsignal = -1;
__libposix_devsignal = &devsignal;
__restart_syscall = &restart_syscall;
__handling_external_signal = &handling_signal;
__libposix_sigchld_father_pid = &sigchld_father_pid;
__libposix_sigchld_child_pid = &sigchld_child_pid;
__libposix_signal_mask = &signal_mask;
__libposix_reset_pending_signals();
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if(!atnotify(__libposix_note_handler, 1))
sysfatal("libposix: atnotify");
__libposix_sighelper_open();
signal_mask = (PosixSignalMask)__libposix_sighelper_cmd(PHGetProcMask, 0);
__libposix_init_signal_handlers();
init(argc, argv);
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libposix_check_configuration();
__initialized = 1;
status = main(argc, argv);
if(__libposix_process_dispose != nil)
__libposix_process_dispose(status);
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POSIX_exit(status);
}
int
libposix_on_process_disposition(PosixProcessDisposer dispose)
{
if(__libposix_process_dispose != nil)
return 0;
__libposix_process_dispose = dispose;
return 1;
}
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int
__libposix_initialized(void)
{
return __initialized;
}
long
__libposix_sighelper_cmd(PosixHelperCommand command, int posix_process_pid)
{
union {
PosixHelperRequest request;
long raw;
} offset;
offset.request.command = command;
offset.request.target = posix_process_pid;
return pwrite(*__libposix_devsignal, "", 0, offset.raw);
}