src/basic/signal-util.h

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 #pragma once
   3
   4 #include <signal.h>
   5
   6 #include "macro.h"
   7
   8 int reset_all_signal_handlers(void);
   9 int reset_signal_mask(void);
  10
  11 int ignore_signals(int sig, ...);
  12 int default_signals(int sig, ...);
  13 int sigaction_many(const struct sigaction *sa, ...);
  14
  15 int sigset_add_many(sigset_t *ss, ...);
  16 int sigprocmask_many(int how, sigset_t *old, ...);
  17
  18 const char *signal_to_string(int i) _const_;
  19 int signal_from_string(const char *s) _pure_;
  20
  21 void nop_signal_handler(int sig);
  22
  23 static inline void block_signals_reset(sigset_t *ss) {
  24         assert_se(sigprocmask(SIG_SETMASK, ss, NULL) >= 0);
  25 }
  26
  27 #define BLOCK_SIGNALS(...)                                                         \
  28         _cleanup_(block_signals_reset) _unused_ sigset_t _saved_sigset = ({        \
  29                 sigset_t _t;                                                       \
  30                 assert_se(sigprocmask_many(SIG_BLOCK, &_t, __VA_ARGS__, -1) >= 0); \
  31                 _t;                                                                \
  32         })
  33
  34 static inline bool SIGNAL_VALID(int signo) {
  35         return signo > 0 && signo < _NSIG;
  36 }
  37
  38 static inline const char* signal_to_string_with_check(int n) {
  39         if (!SIGNAL_VALID(n))
  40                 return NULL;
  41
  42         return signal_to_string(n);
  43 }