diff options
Diffstat (limited to 'src/basic/signal-util.c')
| -rw-r--r-- | src/basic/signal-util.c | 278 |
1 files changed, 0 insertions, 278 deletions
diff --git a/src/basic/signal-util.c b/src/basic/signal-util.c deleted file mode 100644 index 280b5c3251..0000000000 --- a/src/basic/signal-util.c +++ /dev/null @@ -1,278 +0,0 @@ -/*** - This file is part of systemd. - - Copyright 2015 Lennart Poettering - - systemd is free software; you can redistribute it and/or modify it - under the terms of the GNU Lesser General Public License as published by - the Free Software Foundation; either version 2.1 of the License, or - (at your option) any later version. - - systemd 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 - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public License - along with systemd; If not, see <http://www.gnu.org/licenses/>. -***/ - -#include <errno.h> -#include <stdarg.h> -#include <stdio.h> - -#include "macro.h" -#include "parse-util.h" -#include "signal-util.h" -#include "stdio-util.h" -#include "string-table.h" -#include "string-util.h" - -int reset_all_signal_handlers(void) { - static const struct sigaction sa = { - .sa_handler = SIG_DFL, - .sa_flags = SA_RESTART, - }; - int sig, r = 0; - - for (sig = 1; sig < _NSIG; sig++) { - - /* These two cannot be caught... */ - if (sig == SIGKILL || sig == SIGSTOP) - continue; - - /* On Linux the first two RT signals are reserved by - * glibc, and sigaction() will return EINVAL for them. */ - if ((sigaction(sig, &sa, NULL) < 0)) - if (errno != EINVAL && r >= 0) - r = -errno; - } - - return r; -} - -int reset_signal_mask(void) { - sigset_t ss; - - if (sigemptyset(&ss) < 0) - return -errno; - - if (sigprocmask(SIG_SETMASK, &ss, NULL) < 0) - return -errno; - - return 0; -} - -static int sigaction_many_ap(const struct sigaction *sa, int sig, va_list ap) { - int r = 0; - - /* negative signal ends the list. 0 signal is skipped. */ - - if (sig < 0) - return 0; - - if (sig > 0) { - if (sigaction(sig, sa, NULL) < 0) - r = -errno; - } - - while ((sig = va_arg(ap, int)) >= 0) { - - if (sig == 0) - continue; - - if (sigaction(sig, sa, NULL) < 0) { - if (r >= 0) - r = -errno; - } - } - - return r; -} - -int sigaction_many(const struct sigaction *sa, ...) { - va_list ap; - int r; - - va_start(ap, sa); - r = sigaction_many_ap(sa, 0, ap); - va_end(ap); - - return r; -} - -int ignore_signals(int sig, ...) { - - static const struct sigaction sa = { - .sa_handler = SIG_IGN, - .sa_flags = SA_RESTART, - }; - - va_list ap; - int r; - - va_start(ap, sig); - r = sigaction_many_ap(&sa, sig, ap); - va_end(ap); - - return r; -} - -int default_signals(int sig, ...) { - - static const struct sigaction sa = { - .sa_handler = SIG_DFL, - .sa_flags = SA_RESTART, - }; - - va_list ap; - int r; - - va_start(ap, sig); - r = sigaction_many_ap(&sa, sig, ap); - va_end(ap); - - return r; -} - -static int sigset_add_many_ap(sigset_t *ss, va_list ap) { - int sig, r = 0; - - assert(ss); - - while ((sig = va_arg(ap, int)) >= 0) { - - if (sig == 0) - continue; - - if (sigaddset(ss, sig) < 0) { - if (r >= 0) - r = -errno; - } - } - - return r; -} - -int sigset_add_many(sigset_t *ss, ...) { - va_list ap; - int r; - - va_start(ap, ss); - r = sigset_add_many_ap(ss, ap); - va_end(ap); - - return r; -} - -int sigprocmask_many(int how, sigset_t *old, ...) { - va_list ap; - sigset_t ss; - int r; - - if (sigemptyset(&ss) < 0) - return -errno; - - va_start(ap, old); - r = sigset_add_many_ap(&ss, ap); - va_end(ap); - - if (r < 0) - return r; - - if (sigprocmask(how, &ss, old) < 0) - return -errno; - - return 0; -} - -static const char *const __signal_table[] = { - [SIGHUP] = "HUP", - [SIGINT] = "INT", - [SIGQUIT] = "QUIT", - [SIGILL] = "ILL", - [SIGTRAP] = "TRAP", - [SIGABRT] = "ABRT", - [SIGBUS] = "BUS", - [SIGFPE] = "FPE", - [SIGKILL] = "KILL", - [SIGUSR1] = "USR1", - [SIGSEGV] = "SEGV", - [SIGUSR2] = "USR2", - [SIGPIPE] = "PIPE", - [SIGALRM] = "ALRM", - [SIGTERM] = "TERM", -#ifdef SIGSTKFLT - [SIGSTKFLT] = "STKFLT", /* Linux on SPARC doesn't know SIGSTKFLT */ -#endif - [SIGCHLD] = "CHLD", - [SIGCONT] = "CONT", - [SIGSTOP] = "STOP", - [SIGTSTP] = "TSTP", - [SIGTTIN] = "TTIN", - [SIGTTOU] = "TTOU", - [SIGURG] = "URG", - [SIGXCPU] = "XCPU", - [SIGXFSZ] = "XFSZ", - [SIGVTALRM] = "VTALRM", - [SIGPROF] = "PROF", - [SIGWINCH] = "WINCH", - [SIGIO] = "IO", - [SIGPWR] = "PWR", - [SIGSYS] = "SYS" -}; - -DEFINE_PRIVATE_STRING_TABLE_LOOKUP(__signal, int); - -const char *signal_to_string(int signo) { - static thread_local char buf[sizeof("RTMIN+")-1 + DECIMAL_STR_MAX(int) + 1]; - const char *name; - - name = __signal_to_string(signo); - if (name) - return name; - - if (signo >= SIGRTMIN && signo <= SIGRTMAX) - xsprintf(buf, "RTMIN+%d", signo - SIGRTMIN); - else - xsprintf(buf, "%d", signo); - - return buf; -} - -int signal_from_string(const char *s) { - int signo; - int offset = 0; - unsigned u; - - signo = __signal_from_string(s); - if (signo > 0) - return signo; - - if (startswith(s, "RTMIN+")) { - s += 6; - offset = SIGRTMIN; - } - if (safe_atou(s, &u) >= 0) { - signo = (int) u + offset; - if (SIGNAL_VALID(signo)) - return signo; - } - return -EINVAL; -} - -int signal_from_string_try_harder(const char *s) { - int signo; - assert(s); - - signo = signal_from_string(s); - if (signo <= 0) - if (startswith(s, "SIG")) - return signal_from_string(s+3); - - return signo; -} - -void nop_signal_handler(int sig) { - /* nothing here */ -} |