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

fusl/arch/powerpc/bits/signal.h

Index: fusl/arch/powerpc/bits/signal.h
diff --git a/fusl/arch/powerpc/bits/signal.h b/fusl/arch/powerpc/bits/signal.h
new file mode 100644
index 0000000000000000000000000000000000000000..17a7354f8d41f776046ff211adb0ebd8ee1142f6
--- /dev/null
+++ b/fusl/arch/powerpc/bits/signal.h
@@ -0,0 +1,120 @@
+#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 4096
+#define SIGSTKSZ 10240
+#endif
+
+#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
+
+typedef unsigned long greg_t, gregset_t[48];
+
+typedef struct {
+	double fpregs[32];
+	double fpscr;
+	unsigned _pad[2];
+} fpregset_t;
+
+typedef struct {
+	unsigned vrregs[32][4];
+	unsigned vrsave;
+	unsigned _pad[2];
+	unsigned vscr;
+} vrregset_t;
+
+struct sigcontext
+{
+	unsigned long _unused[4];
+	int signal;
+	unsigned long handler;
+	unsigned long oldmask;
+	void *regs;
+};
+
+typedef struct {
+	gregset_t gregs;
+	fpregset_t fpregs;
+	vrregset_t vrregs
+#ifdef __GNUC__
+	__attribute__((__aligned__(16)))
+#endif
+	;
+} mcontext_t;
+
+#else
+
+typedef struct {
+	long __regs[48+68+4*32+4]
+#ifdef __GNUC__
+	__attribute__((__aligned__(16)))
+#endif
+	;
+} 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;
+	int uc_pad[7];
+	mcontext_t *uc_regs;
+	sigset_t uc_sigmask;
+        int             uc_pad2[3];
+	mcontext_t uc_mcontext;
+} ucontext_t;
+
+#define SA_NOCLDSTOP  1U
+#define SA_NOCLDWAIT  2U
+#define SA_SIGINFO    4U
+#define SA_ONSTACK    0x08000000U
+#define SA_RESTART    0x10000000U
+#define SA_NODEFER    0x40000000U
+#define SA_RESETHAND  0x80000000U
+#define SA_RESTORER   0x04000000U
+
+#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