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