296 lines
6.8 KiB
C
296 lines
6.8 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <errno.h>
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#include <stdarg.h>
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#include "macro.h"
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#include "parse-util.h"
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#include "signal-util.h"
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#include "stdio-util.h"
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#include "string-table.h"
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#include "string-util.h"
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int reset_all_signal_handlers(void) {
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static const struct sigaction sa = {
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.sa_handler = SIG_DFL,
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.sa_flags = SA_RESTART,
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};
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int sig, r = 0;
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for (sig = 1; sig < _NSIG; sig++) {
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/* These two cannot be caught... */
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if (IN_SET(sig, SIGKILL, SIGSTOP))
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continue;
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/* On Linux the first two RT signals are reserved by
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* glibc, and sigaction() will return EINVAL for them. */
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if (sigaction(sig, &sa, NULL) < 0)
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if (errno != EINVAL && r >= 0)
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r = -errno;
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}
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return r;
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}
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int reset_signal_mask(void) {
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sigset_t ss;
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if (sigemptyset(&ss) < 0)
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return -errno;
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if (sigprocmask(SIG_SETMASK, &ss, NULL) < 0)
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return -errno;
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return 0;
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}
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static int sigaction_many_ap(const struct sigaction *sa, int sig, va_list ap) {
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int r = 0;
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/* negative signal ends the list. 0 signal is skipped. */
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for (; sig >= 0; sig = va_arg(ap, int)) {
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if (sig == 0)
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continue;
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if (sigaction(sig, sa, NULL) < 0) {
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if (r >= 0)
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r = -errno;
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}
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}
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return r;
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}
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int sigaction_many(const struct sigaction *sa, ...) {
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va_list ap;
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int r;
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va_start(ap, sa);
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r = sigaction_many_ap(sa, 0, ap);
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va_end(ap);
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return r;
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}
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int ignore_signals(int sig, ...) {
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static const struct sigaction sa = {
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.sa_handler = SIG_IGN,
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.sa_flags = SA_RESTART,
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};
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va_list ap;
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int r;
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va_start(ap, sig);
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r = sigaction_many_ap(&sa, sig, ap);
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va_end(ap);
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return r;
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}
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int default_signals(int sig, ...) {
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static const struct sigaction sa = {
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.sa_handler = SIG_DFL,
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.sa_flags = SA_RESTART,
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};
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va_list ap;
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int r;
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va_start(ap, sig);
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r = sigaction_many_ap(&sa, sig, ap);
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va_end(ap);
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return r;
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}
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static int sigset_add_many_ap(sigset_t *ss, va_list ap) {
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int sig, r = 0;
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assert(ss);
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while ((sig = va_arg(ap, int)) >= 0) {
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if (sig == 0)
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continue;
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if (sigaddset(ss, sig) < 0) {
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if (r >= 0)
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r = -errno;
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}
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}
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return r;
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}
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int sigset_add_many(sigset_t *ss, ...) {
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va_list ap;
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int r;
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va_start(ap, ss);
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r = sigset_add_many_ap(ss, ap);
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va_end(ap);
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return r;
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}
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int sigprocmask_many(int how, sigset_t *old, ...) {
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va_list ap;
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sigset_t ss;
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int r;
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if (sigemptyset(&ss) < 0)
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return -errno;
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va_start(ap, old);
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r = sigset_add_many_ap(&ss, ap);
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va_end(ap);
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if (r < 0)
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return r;
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if (sigprocmask(how, &ss, old) < 0)
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return -errno;
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return 0;
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}
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static const char *const __signal_table[] = {
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[SIGHUP] = "HUP",
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[SIGINT] = "INT",
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[SIGQUIT] = "QUIT",
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[SIGILL] = "ILL",
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[SIGTRAP] = "TRAP",
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[SIGABRT] = "ABRT",
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[SIGBUS] = "BUS",
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[SIGFPE] = "FPE",
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[SIGKILL] = "KILL",
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[SIGUSR1] = "USR1",
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[SIGSEGV] = "SEGV",
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[SIGUSR2] = "USR2",
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[SIGPIPE] = "PIPE",
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[SIGALRM] = "ALRM",
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[SIGTERM] = "TERM",
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#ifdef SIGSTKFLT
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[SIGSTKFLT] = "STKFLT", /* Linux on SPARC doesn't know SIGSTKFLT */
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#endif
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[SIGCHLD] = "CHLD",
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[SIGCONT] = "CONT",
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[SIGSTOP] = "STOP",
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[SIGTSTP] = "TSTP",
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[SIGTTIN] = "TTIN",
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[SIGTTOU] = "TTOU",
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[SIGURG] = "URG",
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[SIGXCPU] = "XCPU",
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[SIGXFSZ] = "XFSZ",
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[SIGVTALRM] = "VTALRM",
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[SIGPROF] = "PROF",
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[SIGWINCH] = "WINCH",
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[SIGIO] = "IO",
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[SIGPWR] = "PWR",
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[SIGSYS] = "SYS"
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};
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DEFINE_PRIVATE_STRING_TABLE_LOOKUP(__signal, int);
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const char *signal_to_string(int signo) {
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static thread_local char buf[STRLEN("RTMIN+") + DECIMAL_STR_MAX(int) + 1];
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const char *name;
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name = __signal_to_string(signo);
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if (name)
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return name;
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if (signo >= SIGRTMIN && signo <= SIGRTMAX)
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xsprintf(buf, "RTMIN+%d", signo - SIGRTMIN);
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else
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xsprintf(buf, "%d", signo);
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return buf;
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}
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int signal_from_string(const char *s) {
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const char *p;
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int signo, r;
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/* Check that the input is a signal number. */
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if (safe_atoi(s, &signo) >= 0) {
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if (SIGNAL_VALID(signo))
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return signo;
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else
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return -ERANGE;
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}
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/* Drop "SIG" prefix. */
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if (startswith(s, "SIG"))
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s += 3;
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/* Check that the input is a signal name. */
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signo = __signal_from_string(s);
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if (signo > 0)
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return signo;
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/* Check that the input is RTMIN or
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* RTMIN+n (0 <= n <= SIGRTMAX-SIGRTMIN). */
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p = startswith(s, "RTMIN");
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if (p) {
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if (*p == '\0')
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return SIGRTMIN;
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if (*p != '+')
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return -EINVAL;
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r = safe_atoi(p, &signo);
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if (r < 0)
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return r;
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if (signo < 0 || signo > SIGRTMAX - SIGRTMIN)
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return -ERANGE;
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return signo + SIGRTMIN;
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}
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/* Check that the input is RTMAX or
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* RTMAX-n (0 <= n <= SIGRTMAX-SIGRTMIN). */
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p = startswith(s, "RTMAX");
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if (p) {
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if (*p == '\0')
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return SIGRTMAX;
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if (*p != '-')
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return -EINVAL;
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r = safe_atoi(p, &signo);
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if (r < 0)
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return r;
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if (signo > 0 || signo < SIGRTMIN - SIGRTMAX)
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return -ERANGE;
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return signo + SIGRTMAX;
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}
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return -EINVAL;
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}
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void nop_signal_handler(int sig) {
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/* nothing here */
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}
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int signal_is_blocked(int sig) {
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sigset_t ss;
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int r;
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r = pthread_sigmask(SIG_SETMASK, NULL, &ss);
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if (r != 0)
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return -r;
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r = sigismember(&ss, sig);
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if (r < 0)
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return -errno;
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return r;
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}
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