diff options
Diffstat (limited to 'src/libbasic/signal-util.c')
| -rw-r--r-- | src/libbasic/signal-util.c | 278 |
1 files changed, 278 insertions, 0 deletions
diff --git a/src/libbasic/signal-util.c b/src/libbasic/signal-util.c new file mode 100644 index 0000000000..e3047b209b --- /dev/null +++ b/src/libbasic/signal-util.c @@ -0,0 +1,278 @@ +/*** + 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 (signo > 0 && signo < _NSIG) + 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 */ +} |