rename fork source file

[musl] / src / thread / pthread_cancel.c

diff --git a/src/thread/pthread_cancel.c b/src/thread/pthread_cancel.c
index fde0908..2f9d5e9 100644 (file)
--- a/src/thread/pthread_cancel.c
+++ b/src/thread/pthread_cancel.c
@@ -1,15 +1,11 @@
+#define _GNU_SOURCE
 #include <string.h>
 #include "pthread_impl.h"
 #include "syscall.h"
-#include "libc.h"
 
-#ifdef SHARED
-#define hidden __attribute__((__visibility__("hidden")))
-#else
-#define hidden
-#endif
+hidden long __cancel(), __syscall_cp_asm(), __syscall_cp_c();
 
-hidden long __cancel()
+long __cancel()
 {
        pthread_t self = __pthread_self();
        if (self->canceldisable == PTHREAD_CANCEL_ENABLE || self->cancelasync)
@@ -18,18 +14,10 @@ hidden long __cancel()
        return -ECANCELED;
 }
 
-/* If __syscall_cp_asm has adjusted the stack pointer, it must provide a
- * definition of __cp_cancel to undo those adjustments and call __cancel.
- * Otherwise, __cancel provides a definition for __cp_cancel. */
-
-hidden weak_alias(__cancel, __cp_cancel);
-
-hidden
 long __syscall_cp_asm(volatile void *, syscall_arg_t,
                       syscall_arg_t, syscall_arg_t, syscall_arg_t,
                       syscall_arg_t, syscall_arg_t, syscall_arg_t);
 
-hidden
 long __syscall_cp_c(syscall_arg_t nr,
                     syscall_arg_t u, syscall_arg_t v, syscall_arg_t w,
                     syscall_arg_t x, syscall_arg_t y, syscall_arg_t z)
@@ -55,20 +43,24 @@ static void _sigaddset(sigset_t *set, int sig)
        set->__bits[s/8/sizeof *set->__bits] |= 1UL<<(s&8*sizeof *set->__bits-1);
 }
 
+extern hidden const char __cp_begin[1], __cp_end[1], __cp_cancel[1];
+
 static void cancel_handler(int sig, siginfo_t *si, void *ctx)
 {
        pthread_t self = __pthread_self();
        ucontext_t *uc = ctx;
-       const char *ip = ((char **)&uc->uc_mcontext)[CANCEL_REG_IP];
-       hidden extern const char __cp_begin[1], __cp_end[1];
+       uintptr_t pc = uc->uc_mcontext.MC_PC;
 
        a_barrier();
        if (!self->cancel || self->canceldisable == PTHREAD_CANCEL_DISABLE) return;
 
        _sigaddset(&uc->uc_sigmask, SIGCANCEL);
 
-       if (self->cancelasync || ip >= __cp_begin && ip < __cp_end) {
-               ((char **)&uc->uc_mcontext)[CANCEL_REG_IP] = (char *)__cp_cancel;
+       if (self->cancelasync || pc >= (uintptr_t)__cp_begin && pc < (uintptr_t)__cp_end) {
+               uc->uc_mcontext.MC_PC = (uintptr_t)__cp_cancel;
+#ifdef CANCEL_GOT
+               uc->uc_mcontext.MC_GOT = CANCEL_GOT;
+#endif
                return;
        }
 
@@ -100,5 +92,10 @@ int pthread_cancel(pthread_t t)
                init = 1;
        }
        a_store(&t->cancel, 1);
+       if (t == pthread_self()) {
+               if (t->canceldisable == PTHREAD_CANCEL_ENABLE && t->cancelasync)
+                       pthread_exit(PTHREAD_CANCELED);
+               return 0;
+       }
        return pthread_kill(t, SIGCANCEL);
 }