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271 lines
8.0 KiB
C++
271 lines
8.0 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/StringView.h>
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#include <assert.h>
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#include <bits/pthread_cancel.h>
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#include <errno.h>
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#include <setjmp.h>
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#include <signal.h>
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#include <string.h>
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#include <sys/select.h>
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#include <syscall.h>
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#include <unistd.h>
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extern "C" {
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// https://pubs.opengroup.org/onlinepubs/9699919799/functions/kill.html
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int kill(pid_t pid, int sig)
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{
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int rc = syscall(SC_kill, pid, sig);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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// https://pubs.opengroup.org/onlinepubs/9699919799/functions/killpg.html
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int killpg(int pgrp, int sig)
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{
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int rc = syscall(SC_killpg, pgrp, sig);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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// https://pubs.opengroup.org/onlinepubs/9699919799/functions/raise.html
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int raise(int sig)
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{
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// FIXME: Support multi-threaded programs.
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return kill(getpid(), sig);
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}
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// https://pubs.opengroup.org/onlinepubs/9699919799/functions/signal.html
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sighandler_t signal(int signum, sighandler_t handler)
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{
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struct sigaction new_act;
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struct sigaction old_act;
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new_act.sa_handler = handler;
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new_act.sa_flags = 0;
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new_act.sa_mask = 0;
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int rc = sigaction(signum, &new_act, &old_act);
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if (rc < 0)
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return SIG_ERR;
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return old_act.sa_handler;
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}
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// https://pubs.opengroup.org/onlinepubs/9699919799/functions/sigaction.html
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int sigaction(int signum, const struct sigaction* act, struct sigaction* old_act)
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{
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int rc = syscall(SC_sigaction, signum, act, old_act);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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// https://pubs.opengroup.org/onlinepubs/9699919799/functions/sigemptyset.html
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int sigemptyset(sigset_t* set)
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{
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*set = 0;
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return 0;
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}
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// https://pubs.opengroup.org/onlinepubs/9699919799/functions/sigfillset.html
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int sigfillset(sigset_t* set)
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{
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*set = 0xffffffff;
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return 0;
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}
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// https://pubs.opengroup.org/onlinepubs/9699919799/functions/sigaddset.html
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int sigaddset(sigset_t* set, int sig)
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{
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if (sig < 1 || sig > 32) {
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errno = EINVAL;
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return -1;
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}
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*set |= 1 << (sig - 1);
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return 0;
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}
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// https://pubs.opengroup.org/onlinepubs/9699919799/functions/sigaltstack.html
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int sigaltstack(stack_t const* ss, stack_t* old_ss)
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{
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int rc = syscall(SC_sigaltstack, ss, old_ss);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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// https://pubs.opengroup.org/onlinepubs/9699919799/functions/sigdelset.html
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int sigdelset(sigset_t* set, int sig)
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{
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if (sig < 1 || sig > 32) {
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errno = EINVAL;
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return -1;
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}
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*set &= ~(1 << (sig - 1));
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return 0;
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}
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// https://pubs.opengroup.org/onlinepubs/009696699/functions/siginterrupt.html
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int siginterrupt(int sig, int flag)
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{
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struct sigaction act;
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int rc = sigaction(sig, nullptr, &act);
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if (rc < 0)
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return rc;
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if (flag)
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act.sa_flags &= ~SA_RESTART;
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else
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act.sa_flags |= SA_RESTART;
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return sigaction(sig, &act, nullptr);
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}
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// https://pubs.opengroup.org/onlinepubs/9699919799/functions/sigismember.html
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int sigismember(sigset_t const* set, int sig)
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{
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if (sig < 1 || sig > 32) {
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errno = EINVAL;
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return -1;
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}
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if (*set & (1 << (sig - 1)))
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return 1;
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return 0;
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}
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// https://pubs.opengroup.org/onlinepubs/9699919799/functions/sigprocmask.html
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int sigprocmask(int how, sigset_t const* set, sigset_t* old_set)
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{
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int rc = syscall(SC_sigprocmask, how, set, old_set);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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// https://pubs.opengroup.org/onlinepubs/9699919799/functions/sigpending.html
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int sigpending(sigset_t* set)
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{
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int rc = syscall(SC_sigpending, set);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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// Signal 0 (the null signal) and Signal 32 (SIGCANCEL) are deliberately set to null here.
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// They are not intended to be resolved by strsignal(), getsignalname() or getsignalbyname().
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#define ENUMERATE_SIGNALS \
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__ENUMERATE_SIGNAL(nullptr, nullptr) \
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__ENUMERATE_SIGNAL("HUP", "Hangup") \
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__ENUMERATE_SIGNAL("INT", "Interrupt") \
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__ENUMERATE_SIGNAL("QUIT", "Quit") \
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__ENUMERATE_SIGNAL("ILL", "Illegal instruction") \
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__ENUMERATE_SIGNAL("TRAP", "Trap") \
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__ENUMERATE_SIGNAL("ABRT", "Aborted") \
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__ENUMERATE_SIGNAL("BUS", "Bus error") \
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__ENUMERATE_SIGNAL("FPE", "Division by zero") \
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__ENUMERATE_SIGNAL("KILL", "Killed") \
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__ENUMERATE_SIGNAL("USR1", "User signal 1") \
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__ENUMERATE_SIGNAL("SEGV", "Segmentation violation") \
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__ENUMERATE_SIGNAL("USR2", "User signal 2") \
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__ENUMERATE_SIGNAL("PIPE", "Broken pipe") \
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__ENUMERATE_SIGNAL("ALRM", "Alarm clock") \
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__ENUMERATE_SIGNAL("TERM", "Terminated") \
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__ENUMERATE_SIGNAL("STKFLT", "Stack fault") \
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__ENUMERATE_SIGNAL("CHLD", "Child exited") \
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__ENUMERATE_SIGNAL("CONT", "Continued") \
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__ENUMERATE_SIGNAL("STOP", "Stopped (signal)") \
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__ENUMERATE_SIGNAL("TSTP", "Stopped") \
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__ENUMERATE_SIGNAL("TTIN", "Stopped (tty input)") \
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__ENUMERATE_SIGNAL("TTOU", "Stopped (tty output)") \
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__ENUMERATE_SIGNAL("URG", "Urgent I/O condition)") \
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__ENUMERATE_SIGNAL("XCPU", "CPU limit exceeded") \
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__ENUMERATE_SIGNAL("XFSZ", "File size limit exceeded") \
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__ENUMERATE_SIGNAL("VTALRM", "Virtual timer expired") \
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__ENUMERATE_SIGNAL("PROF", "Profiling timer expired") \
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__ENUMERATE_SIGNAL("WINCH", "Window changed") \
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__ENUMERATE_SIGNAL("IO", "I/O possible") \
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__ENUMERATE_SIGNAL("INFO", "Power failure") \
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__ENUMERATE_SIGNAL("SYS", "Bad system call") \
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__ENUMERATE_SIGNAL(nullptr, nullptr)
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char const* sys_siglist[NSIG] = {
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#define __ENUMERATE_SIGNAL(name, description) description,
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ENUMERATE_SIGNALS
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#undef __ENUMERATE_SIGNAL
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};
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char const* sys_signame[NSIG] = {
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#define __ENUMERATE_SIGNAL(name, description) name,
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ENUMERATE_SIGNALS
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#undef __ENUMERATE_SIGNAL
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};
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// https://pubs.opengroup.org/onlinepubs/9699919799/functions/siglongjmp.html
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void siglongjmp(jmp_buf env, int val)
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{
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if (env->did_save_signal_mask) {
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int rc = sigprocmask(SIG_SETMASK, &env->saved_signal_mask, nullptr);
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assert(rc == 0);
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}
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longjmp(env, val);
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}
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// https://pubs.opengroup.org/onlinepubs/9699919799/functions/sigsuspend.html
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int sigsuspend(sigset_t const* set)
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{
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__pthread_maybe_cancel();
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int rc = syscall(SC_sigsuspend, set);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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// https://pubs.opengroup.org/onlinepubs/009604499/functions/sigwait.html
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int sigwait(sigset_t const* set, int* sig)
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{
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__pthread_maybe_cancel();
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int rc = syscall(Syscall::SC_sigtimedwait, set, nullptr, nullptr);
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VERIFY(rc != 0);
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if (rc < 0)
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return -rc;
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*sig = rc;
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return 0;
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}
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// https://pubs.opengroup.org/onlinepubs/9699919799/functions/sigwaitinfo.html
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int sigwaitinfo(sigset_t const* set, siginfo_t* info)
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{
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return sigtimedwait(set, info, nullptr);
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}
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// https://pubs.opengroup.org/onlinepubs/9699919799/functions/sigtimedwait.html
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int sigtimedwait(sigset_t const* set, siginfo_t* info, struct timespec const* timeout)
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{
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__pthread_maybe_cancel();
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int rc = syscall(Syscall::SC_sigtimedwait, set, info, timeout);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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int getsignalbyname(char const* name)
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{
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VERIFY(name);
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StringView name_sv { name, strlen(name) };
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for (size_t i = 1; i < NSIG; ++i) {
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if (!sys_signame[i])
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continue;
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StringView signal_name { sys_signame[i], strlen(sys_signame[i]) };
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if (signal_name == name_sv || (name_sv.starts_with("SIG"sv) && signal_name == name_sv.substring_view(3)))
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return i;
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}
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errno = EINVAL;
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return -1;
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}
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char const* getsignalname(int signal)
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{
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if (signal <= 0 || signal >= NSIG) {
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errno = EINVAL;
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return nullptr;
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}
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auto const* result = sys_signame[signal];
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if (!result)
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errno = EINVAL;
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return result;
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}
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}
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