--- /dev/null
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#if defined(TEST_sigstack) || defined(TEST_sigaltstack)
+#include <sys/types.h>
+#include <signal.h>
+#include <unistd.h>
+#endif
+#if defined(TEST_makecontext)
+#include <ucontext.h>
+#endif
+union alltypes {
+ long l;
+ double d;
+ void *vp;
+ void (*fp)(void);
+ char *cp;
+};
+static volatile char *handler_addr = (char *)0xDEAD;
+#if defined(TEST_sigstack) || defined(TEST_sigaltstack)
+static volatile int handler_done = 0;
+void handler(int sig)
+{
+ char garbage[1024];
+ int i;
+ auto int dummy;
+ for (i = 0; i < 1024; i++)
+ garbage[i] = 'X';
+ handler_addr = (char *)&dummy;
+ handler_done = 1;
+ return;
+}
+#endif
+#if defined(TEST_makecontext)
+static ucontext_t uc_handler;
+static ucontext_t uc_main;
+void handler(void)
+{
+ char garbage[1024];
+ int i;
+ auto int dummy;
+ for (i = 0; i < 1024; i++)
+ garbage[i] = 'X';
+ handler_addr = (char *)&dummy;
+ swapcontext(&uc_handler, &uc_main);
+ return;
+}
+#endif
+int main(int argc, char *argv[])
+{
+ FILE *f;
+ char *skaddr;
+ char *skbuf;
+ int sksize;
+ char result[1024];
+ int i;
+ sksize = 32768;
+ skbuf = (char *)malloc(sksize*2+2*sizeof(union alltypes));
+ if (skbuf == NULL)
+ exit(1);
+ for (i = 0; i < sksize*2+2*sizeof(union alltypes); i++)
+ skbuf[i] = 'A';
+ skaddr = skbuf+sizeof(union alltypes);
+#if defined(TEST_sigstack) || defined(TEST_sigaltstack)
+ {
+ struct sigaction sa;
+#if defined(TEST_sigstack)
+ struct sigstack ss;
+#elif defined(TEST_sigaltstack) && defined(HAVE_STACK_T)
+ stack_t ss;
+#else
+ struct sigaltstack ss;
+#endif
+#if defined(TEST_sigstack)
+ ss.ss_sp = (void *)(skaddr + sksize);
+ ss.ss_onstack = 0;
+ if (sigstack(&ss, NULL) < 0)
+ exit(1);
+#elif defined(TEST_sigaltstack)
+ ss.ss_sp = (void *)(skaddr + sksize);
+ ss.ss_size = sksize;
+ ss.ss_flags = 0;
+ if (sigaltstack(&ss, NULL) < 0)
+ exit(1);
+#endif
+ memset((void *)&sa, 0, sizeof(struct sigaction));
+ sa.sa_handler = handler;
+ sa.sa_flags = SA_ONSTACK;
+ sigemptyset(&sa.sa_mask);
+ sigaction(SIGUSR1, &sa, NULL);
+ kill(getpid(), SIGUSR1);
+ while (!handler_done)
+ /*nop*/;
+ }
+#endif
+#if defined(TEST_makecontext)
+ {
+ if (getcontext(&uc_handler) != 0)
+ exit(1);
+ uc_handler.uc_link = NULL;
+ uc_handler.uc_stack.ss_sp = (void *)(skaddr + sksize);
+ uc_handler.uc_stack.ss_size = sksize;
+ uc_handler.uc_stack.ss_flags = 0;
+ makecontext(&uc_handler, handler, 0);
+ swapcontext(&uc_main, &uc_handler);
+ }
+#endif
+ if (handler_addr == (char *)0xDEAD)
+ exit(1);
+ if (handler_addr < skaddr+sksize) {
+ /* stack was placed into lower area */
+ if (*(skaddr+sksize) != 'A')
+ sprintf(result, "(skaddr)+(sksize)-%d,(sksize)-%d",
+ sizeof(union alltypes), sizeof(union alltypes));
+ else
+ strcpy(result, "(skaddr)+(sksize),(sksize)");
+ }
+ else {
+ /* stack was placed into higher area */
+ if (*(skaddr+sksize*2) != 'A')
+ sprintf(result, "(skaddr),(sksize)-%d", sizeof(union alltypes));
+ else
+ strcpy(result, "(skaddr),(sksize)");
+ }
+ if ((f = fopen("conftestval", "w")) == NULL)
+ exit(1);
+ fprintf(f, "%s\n", result);
+ fclose(f);
+ exit(0);
+}