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cont.c: refined error message

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* cont.c (fiber_machine_stack_alloc): refined the error message on
  failure at setting a guard page.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63351 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2018-05-07 23:14:07 +00:00
parent 6c62356e5a
commit cd36bea568
1 changed files with 4 additions and 2 deletions
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6
cont.c
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@ -769,6 +769,8 @@ fiber_entry(void *arg)
#define FIBER_STACK_FLAGS (MAP_PRIVATE | MAP_ANON)
#endif
#define ERRNOMSG strerror(errno)
static char*
fiber_machine_stack_alloc(size_t size)
{
@ -793,13 +795,13 @@ fiber_machine_stack_alloc(size_t size)
errno = 0;
ptr = mmap(NULL, size, PROT_READ | PROT_WRITE, FIBER_STACK_FLAGS, -1, 0);
if (ptr == MAP_FAILED) {
rb_raise(rb_eFiberError, "can't alloc machine stack to fiber: %s", strerror(errno));
rb_raise(rb_eFiberError, "can't alloc machine stack to fiber: %s", ERRNOMSG);
}
/* guard page setup */
page = ptr + STACK_DIR_UPPER(size - RB_PAGE_SIZE, 0);
if (mprotect(page, RB_PAGE_SIZE, PROT_NONE) < 0) {
rb_raise(rb_eFiberError, "mprotect failed");
rb_raise(rb_eFiberError, "can't set a guard page: %s", ERRNOMSG);
}
}