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signal lib to reduce duplicating code

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This commit is contained in:
Maxim Devaev
2024-03-04 03:12:14 +02:00
parent b556dfb897
commit c8dc5119fe
6 changed files with 120 additions and 90 deletions
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82
src/libs/signal.c Normal file
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@@ -0,0 +1,82 @@
/*****************************************************************************
# #
# uStreamer - Lightweight and fast MJPEG-HTTP streamer. #
# #
# Copyright (C) 2018-2023 Maxim Devaev <mdevaev@gmail.com> #
# #
# 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 <https://www.gnu.org/licenses/>. #
# #
*****************************************************************************/
#include "signal.h"
#include <string.h>
#include <signal.h>
#include <assert.h>
#if defined(__GLIBC__) && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 32
# define HAS_SIGABBREV_NP
#endif
#include "types.h"
#include "tools.h"
#include "logging.h"
char *us_signum_to_string(int signum) {
# ifdef HAS_SIGABBREV_NP
const char *const name = sigabbrev_np(signum);
# else
const char *const name = (
signum == SIGTERM ? "TERM" :
signum == SIGINT ? "INT" :
signum == SIGPIPE ? "PIPE" :
NULL
);
# endif
char *buf;
if (name != NULL) {
US_ASPRINTF(buf, "SIG%s", name);
} else {
US_ASPRINTF(buf, "SIG[%d]", signum);
}
return buf;
}
void us_install_signals_handler(us_signal_handler_f handler, bool ignore_sigpipe) {
struct sigaction sig_act = {0};
assert(!sigemptyset(&sig_act.sa_mask));
sig_act.sa_handler = handler;
assert(!sigaddset(&sig_act.sa_mask, SIGINT));
assert(!sigaddset(&sig_act.sa_mask, SIGTERM));
if (!ignore_sigpipe) {
assert(!sigaddset(&sig_act.sa_mask, SIGPIPE));
}
US_LOG_DEBUG("Installing SIGINT handler ...");
assert(!sigaction(SIGINT, &sig_act, NULL));
US_LOG_DEBUG("Installing SIGTERM handler ...");
assert(!sigaction(SIGTERM, &sig_act, NULL));
if (!ignore_sigpipe) {
US_LOG_DEBUG("Installing SIGPIPE handler ...");
assert(!sigaction(SIGPIPE, &sig_act, NULL));
} else {
US_LOG_DEBUG("Ignoring SIGPIPE ...");
assert(signal(SIGPIPE, SIG_IGN) != SIG_ERR);
}
}

32
src/libs/signal.h Normal file
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@@ -0,0 +1,32 @@
/*****************************************************************************
# #
# uStreamer - Lightweight and fast MJPEG-HTTP streamer. #
# #
# Copyright (C) 2018-2023 Maxim Devaev <mdevaev@gmail.com> #
# #
# 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 <https://www.gnu.org/licenses/>. #
# #
*****************************************************************************/
#pragma once
#include "types.h"
typedef void (*us_signal_handler_f)(int);
char *us_signum_to_string(int signum);
void us_install_signals_handler(us_signal_handler_f handler, bool ignore_sigpipe);

26
src/libs/tools.h
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@@ -34,12 +34,6 @@
#include <sys/file.h>
#if defined(__GLIBC__) && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 32
# define HAS_SIGABBREV_NP
#else
# include <signal.h>
#endif
#include "types.h"
@@ -192,23 +186,3 @@ INLINE char *us_errno_to_string(int error) {
return us_strdup(strerror_r(error, buf, max_len));
# endif
}
INLINE char *us_signum_to_string(int signum) {
# ifdef HAS_SIGABBREV_NP
const char *const name = sigabbrev_np(signum);
# else
const char *const name = (
signum == SIGTERM ? "TERM" :
signum == SIGINT ? "INT" :
signum == SIGPIPE ? "PIPE" :
NULL
);
# endif
char *buf;
if (name != NULL) {
US_ASPRINTF(buf, "SIG%s", name);
} else {
US_ASPRINTF(buf, "SIG[%d]", signum);
}
return buf;
}