musl/arch/x86_64/bits/signal.h

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

struct __fpstate {
	unsigned long __x[4];
	unsigned char __y[384];
	unsigned long __z[12];
};

typedef struct {
	unsigned long __gregs[23];
	void *__fpregs;
	unsigned long __reserved1[8];
} mcontext_t;

typedef struct __ucontext {
	unsigned long uc_flags;
	struct __ucontext *uc_link;
	stack_t uc_stack;
	mcontext_t uc_mcontext;
	sigset_t uc_sigmask;
	struct __fpstate __fpregs_mem;
} 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

#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
struct sigcontext {
	unsigned long r8, r9, r10, r11, r12, r13, r14, r15;
	unsigned long rdi, rsi, rbp, rbx, rdx, rax, rcx, rsp, rip, eflags;
	unsigned short cs, gs, fs, __pad0;
	unsigned long err, trapno, oldmask, cr2;
	struct __fpstate *fpstate;
	unsigned long __reserved1[8];
};
#define NSIG      64
#endif

#endif

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