musl/arch/i386/bits/signal.h

#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
 || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)

#if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
#define MINSIGSTKSZ 2048
#define SIGSTKSZ 8192
#endif

#ifdef _GNU_SOURCE
#define REG_GS          0
#define REG_FS          1
#define REG_ES          2
#define REG_DS          3
#define REG_EDI         4
#define REG_ESI         5
#define REG_EBP         6
#define REG_ESP         7
#define REG_EBX         8
#define REG_EDX         9
#define REG_ECX         10
#define REG_EAX         11
#define REG_TRAPNO      12
#define REG_ERR         13
#define REG_EIP         14
#define REG_CS          15
#define REG_EFL         16
#define REG_UESP        17
#define REG_SS          18
#endif

#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
typedef int greg_t, gregset_t[19];
typedef struct _fpstate {
	unsigned long cw, sw, tag, ipoff, cssel, dataoff, datasel;
	struct {
		unsigned short significand[4], exponent;
	} _st[8];
	unsigned long status;
} *fpregset_t;
struct sigcontext {
	unsigned short gs, __gsh, fs, __fsh, es, __esh, ds, __dsh;
	unsigned long edi, esi, ebp, esp, ebx, edx, ecx, eax;
	unsigned long trapno, err, eip;
	unsigned short cs, __csh;
	unsigned long eflags, esp_at_signal;
	unsigned short ss, __ssh;
	struct _fpstate *fpstate;
	unsigned long oldmask, cr2;
};
typedef struct {
	gregset_t gregs;
	fpregset_t fpregs;
	unsigned long oldmask, cr2;
} mcontext_t;
#else
typedef struct {
	unsigned __space[22];
} mcontext_t;
#endif

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

typedef struct __ucontext {
	unsigned long uc_flags;
	struct __ucontext *uc_link;
	stack_t uc_stack;
	mcontext_t uc_mcontext;
	sigset_t uc_sigmask;
	unsigned long __fpregs_mem[28];
} ucontext_t;

#define SA_NOCLDSTOP  1
#define SA_NOCLDWAIT  2
#define SA_SIGINFO    4
#define SA_ONSTACK    0x08000000
#define SA_RESTART    0x10000000
#define SA_NODEFER    0x40000000
#define SA_RESETHAND  0x80000000
#define SA_RESTORER   0x04000000

#endif

#define SIGHUP    1
#define SIGINT    2
#define SIGQUIT   3
#define SIGILL    4
#define SIGTRAP   5
#define SIGABRT   6
#define SIGIOT    SIGABRT
#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   29
#define SIGPWR    30
#define SIGSYS    31
#define SIGUNUSED SIGSYS

#define _NSIG 65