signal.h /usr/include/asm/signal.h

最新推荐文章于 2023-08-19 16:06:24 发布

原创最新推荐文章于 2023-08-19 16:06:24 发布 · 2.3k 阅读

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#signal #struct #constants #header #unix #linux

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此博客主要围绕Unix/Linux系统展开，定义了一系列信号常量，如SIGHUP、SIGINT等，还对信号处理相关的结构体sigaction和sigaltstack进行了定义，同时给出了信号处理标志位、信号栈控制等相关常量的定义。

#ifndef _ASMi386_SIGNAL_H
#define _ASMi386_SIGNAL_H

#include <linux/types.h>

/* Avoid too many header ordering problems. */
struct siginfo;

#define SIGHUP   1
#define SIGINT   2
#define SIGQUIT   3
#define SIGILL   4
#define SIGTRAP   5
#define SIGABRT   6
#define SIGIOT   6
#define SIGBUS   7
#define SIGFPE   8
#define SIGKILL   9
#define SIGUSR1  10
#define SIGSEGV  11
#define SIGUSR2  12
#define SIGPIPE  13
#define SIGALRM  14
#define SIGTERM  15
#define SIGSTKFLT 16
#define SIGCHLD  17
#define SIGCONT  18
#define SIGSTOP  19
#define SIGTSTP  20
#define SIGTTIN  21
#define SIGTTOU  22
#define SIGURG  23
#define SIGXCPU  24
#define SIGXFSZ  25
#define SIGVTALRM 26
#define SIGPROF  27
#define SIGWINCH 28
#define SIGIO  29
#define SIGPOLL  SIGIO
/*
#define SIGLOST  29
*/
#define SIGPWR  30
#define SIGSYS  31
#define SIGUNUSED 31

/* These should not be considered constants from userland. */
#define SIGRTMIN 32
#define SIGRTMAX (_NSIG-1)

/*
* SA_FLAGS values:
*
* SA_ONSTACK indicates that a registered stack_t will be used.
* SA_INTERRUPT is a no-op, but left due to historical reasons. Use the
* SA_RESTART flag to get restarting signals (which were the default long ago)
* SA_NOCLDSTOP flag to turn off SIGCHLD when children stop.
* SA_RESETHAND clears the handler when the signal is delivered.
* SA_NOCLDWAIT flag on SIGCHLD to inhibit zombies.
* SA_NODEFER prevents the current signal from being masked in the handler.
*
* SA_ONESHOT and SA_NOMASK are the historical Linux names for the Single
* Unix names RESETHAND and NODEFER respectively.
*/
#define SA_NOCLDSTOP 0x00000001
#define SA_NOCLDWAIT 0x00000002 /* not supported yet */
#define SA_SIGINFO 0x00000004
#define SA_ONSTACK 0x08000000
#define SA_RESTART 0x10000000
#define SA_NODEFER 0x40000000
#define SA_RESETHAND 0x80000000

#define SA_NOMASK SA_NODEFER
#define SA_ONESHOT SA_RESETHAND
#define SA_INTERRUPT 0x20000000 /* dummy -- ignored */

#define SA_RESTORER 0x04000000

/*
* sigaltstack controls
*/
#define SS_ONSTACK 1
#define SS_DISABLE 2

#define MINSIGSTKSZ 2048
#define SIGSTKSZ 8192

#define SIG_BLOCK          0 /* for blocking signals */
#define SIG_UNBLOCK        1 /* for unblocking signals */
#define SIG_SETMASK        2 /* for setting the signal mask */

/* Type of a signal handler. */
typedef void (*__sighandler_t)(int);

#define SIG_DFL ((__sighandler_t)0) /* default signal handling */
#define SIG_IGN ((__sighandler_t)1) /* ignore signal */
#define SIG_ERR ((__sighandler_t)-1) /* error return from signal */

/* Here we must cater to libcs that poke about in kernel headers. */

struct sigaction {
union {
__sighandler_t _sa_handler;
void (*_sa_sigaction)(int, struct siginfo *, void *);
} _u;
sigset_t sa_mask;
unsigned long sa_flags;
void (*sa_restorer)(void);
};

#define sa_handler _u._sa_handler
#define sa_sigaction _u._sa_sigaction

typedef struct sigaltstack {
void *ss_sp;
int ss_flags;
size_t ss_size;
} stack_t;

#endif