Add a "fork" of musl as //fusl.

fusl/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
+