src/regression/sigaltstack.c

   1 // commit: 6871fd773dcedbf056317d5d5e87b4859e97c4a4 2011-03-10
   2 // commit: 9505bfbc40fec217820abad7142663eda60cd6be 2014-03-18
   3 // catching stackoverflow SIGSEGV using sigaltstack
   4 // mips stack_t is inconsistent with other archs
   5 #define _XOPEN_SOURCE 700
   6 #include <signal.h>
   7 #include <stdint.h>
   8 #include <stdlib.h>
   9 #include <string.h>
  10 #include <errno.h>
  11 #include "test.h"
  12
  13 #define T(f) ((f)==0 || (t_error(#f " failed: %s\n", strerror(errno)),0))
  14
  15 static char stack[SIGSTKSZ];
  16
  17 static void handler(int sig)
  18 {
  19         uintptr_t i;
  20         stack_t ss;
  21
  22         i = (uintptr_t)&i;
  23         if (i < (uintptr_t)stack || i >= (uintptr_t)stack+SIGSTKSZ)
  24                 t_error("signal handler was not invoked on the altstack\n");
  25
  26         T(sigaltstack(0, &ss));
  27         if (ss.ss_flags != SS_ONSTACK)
  28                 t_error("ss_flags is not SS_ONSTACK in the signal handler\n");
  29 }
  30
  31 int main(void)
  32 {
  33         stack_t ss;
  34         struct sigaction sa;
  35
  36         ss.ss_sp = stack;
  37         ss.ss_size = sizeof stack;
  38         ss.ss_flags = 0;
  39         sa.sa_handler = handler;
  40         sa.sa_flags = SA_ONSTACK;
  41
  42         T(sigaltstack(&ss, 0));
  43         T(sigfillset(&sa.sa_mask));
  44         T(sigaction(SIGUSR1, &sa, 0));
  45         T(raise(SIGUSR1));
  46
  47         errno = 0;
  48         ss.ss_size = MINSIGSTKSZ-1;
  49         if (sigaltstack(&ss, 0) != -1 || errno != ENOMEM)
  50                 t_error("sigaltstack with stack size < MINSIGSTKSZ should have failed with ENOMEM, "
  51                         "got %s\n", strerror(errno));
  52         errno = 0;
  53         ss.ss_flags = -1;
  54         ss.ss_size = MINSIGSTKSZ;
  55         if (sigaltstack(&ss, 0) != -1 || errno != EINVAL)
  56                 t_error("sigaltstack with bad ss_flags should have failed with EINVAL, "
  57                         "got %s\n", strerror(errno));
  58         errno = 0;
  59         T(sigaltstack(0, 0));
  60
  61         return t_status;
  62 }