SIGACTION(2) Linux Programmer's Manual SIGACTION(2) åå sigaction, sigprocmask, sigpending, sigsuspend - POSIX ã·ã°ãã«ã»æä½é¢æ° æ¸å¼ #include <signal.h> int sigaction(int signum, const struct sigaction *act, struct sigaction *oldact); int sigprocmask(int how, const sigset_t *set, sigset_t *oldset); int sigpending(sigset_t *set); int sigsuspend(const sigset_t *mask); 説æ sigaction ã·ã¹ãã ã»ã³ã¼ã«ã¯ç¹å®ã®ã·ã°ãã«ãåãã ãã‐ ã»ã¹ã®åä½ãå¤æ´ããã®ã«ä½¿ç¨ããã signum ã¯ã·ã°ãã«ãæå®ããã SIGKILL 㨠SIGSTOP 以å¤ã®å¨ã¦ã®æå¹ãªã·ã°ãã«ãæå®ã§ããã act ã NULL ã§ãªããã° signum ã·ã°ãã«ã®æ°ããåä½ã¨ã㦠act ãè¨å®ãããã oldact ã NULL ã§ãªããã°ä»ã¾ã§ã®åä½ã oldact ã«æ ¼ç´ãããã sigaction æ§é ä½ã¯ä»¥ä¸ã®ããã«å®ç¾©ãããã struct sigaction { void (*sa_handler)(int); sigset_t sa_mask; int sa_flags; void (*sa_restorer)(void); } sa_handler 㯠signum ã«è¨å®ããåä½ãæå®ãã ããã©ã«ãã®åä½ãæå®ãã SIG_DFL ãã ãã®ã·ã°ãã«ãç¡è¦ãã SIG_IGN ããã·ã°ãã«ã»ãã³ãã©ã¼é¢æ°ã¸ã®ãã¤ã³ã¿ã¼ãè¨å®ããã sa_mask ã¯ã·ã°ãã«ã»ãã³ãã©ã¼å®è¡ä¸ã«ç¦æ¢(block)ããã¹ãã·ã°ãã«ã®ãã¹ã¯ã ä¸ãããå ãã¦ã SA_NODEFER ã SA_NOMASK ãã©ã°ã使ç¨ãããªãéãã¯ããã³ãã©ã¼ãå¼ã³åºããã·ã°ãã«ãç¦æ¢ãããã sa_flags ã¯ã·ã°ãã«ã»ãã³ãã©ã¼ã®åä½ãä¿®æ£ããããã®ãã©ã°ã®éåãæå®ããã ãã©ã°ã¯ä»¥ä¸ã®ã¼ãå以ä¸ã®ãã©ã°ã® ãããOR ã«ãã£ã¦è¡¨ç¾ãããã SA_NOCLDSTOP signum ã SIGCHLD ã®å ´åã«ãåããã»ã¹(child process)ãåæ‐ ¢(stop)ããå ´å (ä¾ãã°ãåããã»ã¹ã SIGSTOP, SIGTSTP, SIGTTIN, SIGTTOU ãåããå ´åãªã©) ã®å ±åãåããªãã SA_ONESHOT ã¾ã㯠SA_RESETHAND ä¸åº¦ãã·ã°ãã«ã»ãã³ãã©ã¼ãå¼ã°ããã¨ã·ã°ãã«ã®åä½ãããã©ã«ãã«æ»ãã (ãã㯠signal(2) ã·ã¹ãã ã»ã³ã¼ã«ã®ããã©ã«ãã®åä½ã¨åãã§ããã) SA_RESTART ããã¤ãã·ã¹ãã ã»ã³ã¼ã«ãã·ã°ãã«ãè¶ãã¦åéã§ããããã«ã ããã¨ã§ BSD ã·ã°ãã«ã®æ¹å¼(semantics)ã¨äºææ§ã®ããåä½ãæä¾ããã SA_NOMASK or SA_NODEFER ããèªèº«ã®ã·ã°ãã«ã»ãã³ãã©ã¼ã®åé¨ã«ããæã§ã ã·ã°ãã«ã妨害ããªãããã«ããã sa_restorer è¦ç´ ã¯å»æ¢(obsolete)ãããã®ã§ä½¿ç¨ãã¦ã¯ãããªãã sigprocmask ã³ã¼ã«ã¯ç¾å¨ç¦æ¢(block)ããã¦ããã·ã°ãã«ã®ãªã¹ããå¤æ´ããã ã³ã¼ã«ã®åä½ã¯ how ã®å¤ã«ä¾åã以ä¸ã®ããã«ãªãã SIG_BLOCK ç¦æ¢ãããã·ã°ãã«ã®éåã¯ç¾å¨ã®å¤ã¨ set å¼ãæ°ã«è¨‐ å®ããããã®ã®åæã¨ãªãã SIG_UNBLOCK ç¾å¨ç¦æ¢ããã¦ããã·ã°ãã«ã®éåãã set ã«ããã·ã°ãã«ãåãé¤ããç¦æ‐ ¢ããã¦ããªãã·ã°ãã«ãé¤ãã㨠ãã¦ãåé¡ã¯ãªãã SIG_SETMASK ç¦æ¢ããã¦ããã·ã°ãã«ã®éåã« set å¼ãæ°ãè¨å®ããã oldset ã NULL ã§ãªããã°ãã·ã°ãã«ã»ãã¹ã¯ã®ä»ã¾ã§ã®å¤ã oldset ã«æ ¼ç´ããã sigpending ã³ã¼ã«ã¯å¾æ©(pending)ä¸ã®ã·ã°ãã«(ç¦æ¢ä¸‐ ã«çºçããã·ã°ãã«)ã®æ¤æ»ã è¡ãªããå¾æ©ä¸ã®ã·ã°ãã«ã®ãã¹ã¯ã¯ set ã«æ ¼ç´ãããã sigsuspend ã³ã¼ã«ã¯ä¸æçã«ããã»ã¹ã®ã·ã°ãã«ã»ãã¹ã¯ã mask ã§ä¸ãããããã®ã«ç½®ãæãã ã·ã°ãã«ãåããã¾ã§ãããã»ã¹ãåæ¢(suspend)ããã è¿ãå¤ sigaction, sigprocmask, sigpending sigsuspend ã¯æåããã° 0ãã¨ã©ã¼ãªãã° -1 ãè¿ãã ã¨ã©ã¼ EINVAL ç¡å¹ãªã·ã°ãã«ãæå®ããããããã¯æç²(catch)ã§ããªã SIGKILL ã SIGSTOP ã®è¡åãå¤æ´ãããã¨è©¦ã¿ãå ´åã«ãçºçããã EFAULT act, oldact, set ã¾ã㯠oldset ã®æãã¡ã¢ãªã¼ãæ£ãããã‐ ã»ã¹ã®ã¢ãã¬ã¹ç©ºéã«ãªãã EINTR ã·ã¹ãã ã»ã³ã¼ã«ãå²è¾¼ã¾ããã 注æ sigprocmask ã³ã¼ã«ã§ SIGKILL ã SIGSTOP ãç¦æ‐ ¢ãããã¨ã¯ã§ããªãããã®ãããªè©¦ã¿ã¯é»ã£ã¦ç¡è¦ãããã POSIX ã«ããã¨ãkill() ã raise() é¢æ°ã§çæã§ããªã SIGFPE, SIGILL, SIGSEGV ã·ã°ãã«ãç¡è¦(ignore)ããå¾ã®åä½ã¯æªå®ç¾©ã§ ãããã¼ã‐ ã«ããæ´æ°å²ãç®ã®çµæã¯æªå®ç¾©ã¨ãªãã ãã種ã®ã¢ã¼ã‐ ãã¯ãã£ã¼(architecture)ã§ã¯ãã㯠SIGFPE ã·ã°ãã« ãçæããããã®ã·ã°ãã«ãç¡è¦ããã¨ç¡éã«ã¼ãã«è½ã¡ãããããããªãã SIGCHLD ã SIG_IGN ã«è¨å®ããã¨åããã»ã¹ã®èªåçãªåãåã(reap)ãè¡ãªããã POSIX ã®ä»æ§ã§ã¯ SA_NOCLDSTOP ã®ã¿ãå®ç¾©ããã¦ããã ä»ã® sa_flags ãã©ã°ã使ç¨ãããã¨ã¯ç§»æ¤æ§(portable)ããªãã SA_RESETHAND ãã©ã°ã¯ SVr4 ã®åãååã®ãã©ã°ã¨äºææ§(compatible)ãããã The SA_NODEFER ãã©ã°ã¯ 1.3.9 以éã®ã«ã¼ãã«ã§ã¯åãååã® SVr4 ã®ãã©ã°ã¨äºææ§ãããã ããå¤ãã«ã¼ãã«ã§ã® Linux ã®å®è£ã§ã¯ä¸ã¤ã ãã§ãªãå¨ã¦ã®ã·ã°ãã« åãããã¨ã許ãã¦ããã(å®éã«ã¯ sa_mask ã®è¨å®ã«ããç¡å¹ã«ã§ããã) SVr4 ã¨ã®äºææ§ã®ããã«åä»ãããã SA_RESETHAND 㨠SA_NODEFER ã¯ã©ã¤ãã©ãªã¼ã®ãã¼ã¸ã§ã³ 3.0.9 以éã«åå¨ããã sigaction ã¯ç¾å¨ã®ã·ã°ãã«ã»ãã³ãã©ã¼ã確èªããããã«äºçªç®ã®å¼ãæ°ã« NULL ã æå®ãã¦å¼ã³åºããã¨ãã§ãããã¾ãäºçªç®ã¨ä¸çªç®ã®å¼ãæ°ã NULL ã«ã¦ å¼ã³åºããã¨ã«ãã£ã¦ä¸ããããã·ã°ãã«ãç¾å¨ã®ãã·ã³ã§ä½¿ãããã©ãã ãã§ãã¯ã§ããã ã·ã°ãã«éåã®æä½ã«é¢ãã¦ãã詳ãã㯠sigsetops(3) ãåç§ããã㨠æºæ POSIX, SVr4. SVr4 ã«ã¯ EINTR ã«ã¤ãã¦ã®è¨è¿°ã¯ãªãã é¢é£é ç® kill(1), kill(2), killpg(2), pause(2), raise(3), siginterrupt(3), signal(2), signal(7), sigsetops(3), sigvec(2) Linux 1.3 24 August 1995 SIGACTION(2)