Commit d4c7616d authored by David Gibson's avatar David Gibson

configurator: Add test for ucontext.h

This adds a new HAVE_UCONTEXT define, which indicates that ucontext.h
is present, and more-or-less works.

It also adds HAVE_POINTER_SAFE_MAKECONTEXT, which indicates whether
pointer valued arguments can be passed through the varargs parameters
to makecontext().
Signed-off-by: default avatarDavid Gibson <david@gibson.dropbear.id.au>
parent 11af31c3
...@@ -319,6 +319,52 @@ static struct test tests[] = { ...@@ -319,6 +319,52 @@ static struct test tests[] = {
"-Werror -fopenmp" }, "-Werror -fopenmp" },
{ "HAVE_VALGRIND_MEMCHECK_H", OUTSIDE_MAIN, NULL, NULL, { "HAVE_VALGRIND_MEMCHECK_H", OUTSIDE_MAIN, NULL, NULL,
"#include <valgrind/memcheck.h>\n" }, "#include <valgrind/memcheck.h>\n" },
{ "HAVE_UCONTEXT", DEFINES_EVERYTHING|EXECUTE,
NULL, NULL,
"#include <ucontext.h>\n"
"static int x = 0;\n"
"static char stack[1024];\n"
"static ucontext_t a, b;\n"
"static void fn(void) {\n"
" x |= 2;\n"
" setcontext(&b);\n"
" x |= 4;\n"
"}\n"
"int main(int argc, char *argv[]) {\n"
" x |= 1;\n"
" getcontext(&a);\n"
" a.uc_stack.ss_sp = stack;\n"
" a.uc_stack.ss_size = sizeof(stack);\n"
" makecontext(&a, fn, 0);\n"
" swapcontext(&b, &a);\n"
" return (x == 3) ? 0 : 1;\n"
"}\n"
},
{ "HAVE_POINTER_SAFE_MAKECONTEXT", DEFINES_EVERYTHING|EXECUTE,
"HAVE_UCONTEXT", NULL,
"#include <stddef.h>\n"
"#include <ucontext.h>\n"
"static int worked = 0;\n"
"static char stack[1024];\n"
"static ucontext_t a, b;\n"
"static void fn(void *p, void *q) {\n"
" void *cp = &worked;\n"
" void *cq = (void *)(~((ptrdiff_t)cp));\n"
" if ((p == cp) && (q == cq))\n"
" worked = 1;\n"
" setcontext(&b);\n"
"}\n"
"int main(int argc, char *argv[]) {\n"
" void *ap = &worked;\n"
" void *aq = (void *)(~((ptrdiff_t)ap));\n"
" getcontext(&a);\n"
" a.uc_stack.ss_sp = stack;\n"
" a.uc_stack.ss_size = sizeof(stack);\n"
" makecontext(&a, (void (*)(void))fn, 2, ap, aq);\n"
" swapcontext(&b, &a);\n"
" return worked ? 0 : 1;\n"
"}\n"
},
}; };
static char *grab_fd(int fd) static char *grab_fd(int fd)
......
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