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posix: use sigjmp_buf

--- a/src/dos/platform.h

+++ b/src/dos/platform.h

@@ -31,6 +31,7 @@

 #define USED(x) ((void)(x))

 #define nelem(x) (int)(sizeof(x)/sizeof((x)[0]))

+typedef jmp_buf sl_jmp_buf;

 #define sl_setjmp(e) setjmp((e))

 #define sl_longjmp(e, v) longjmp((e), (v))

--- a/src/macos/platform.h

+++ b/src/macos/platform.h

@@ -34,6 +34,7 @@

 #define USED(x) ((void)(x))

 #define nelem(x) (int)(sizeof(x)/sizeof((x)[0]))

+typedef jmp_buf sl_jmp_buf;

 #define sl_setjmp(e) setjmp((e))

 #define sl_longjmp(e, v) longjmp((e), (v))

--- a/src/plan9/platform.h

+++ b/src/plan9/platform.h

@@ -25,6 +25,7 @@

 int sl_popcount(unsigned int w);

 int sl_clz(unsigned int x);

+typedef jmp_buf sl_jmp_buf;

 #define sl_setjmp(e) setjmp((e))

 #define sl_longjmp(e, v) longjmp((e), (v))

--- a/src/posix/platform.h

+++ b/src/posix/platform.h

@@ -61,6 +61,7 @@

 #endif

 #endif

+typedef sigjmp_buf sl_jmp_buf;

 #define sl_setjmp(e) sigsetjmp((e), 0)

 #define sl_longjmp(e, v) siglongjmp((e), (v))

--- a/src/sl.h

+++ b/src/sl.h

@@ -233,7 +233,7 @@

 typedef struct _ectx_t {

 	sl_readstate *rdst;

 	struct _ectx_t *prev;

-	jmp_buf buf;

+	sl_jmp_buf buf;

 	sl_v *sp;

 	sl_v *frame;

 	int ngchnd;