tests/testsig.c

   1 #define _GNU_SOURCE
   2 #include <stdlib.h>
   3 #include <stdio.h>
   4 #include <string.h>
   5 #include <signal.h>
   6 #include <unistd.h>
   7 #include <setjmp.h>
   8 #include <sys/ucontext.h>
   9
  10 jmp_buf jmp_env;
  11
  12 void alarm_handler(int sig)
  13 {
  14     printf("alarm signal=%d\n", sig);
  15     alarm(1);
  16 }
  17
  18 void dump_regs(struct ucontext *uc)
  19 {
  20     printf("EAX=%08x EBX=%08x ECX=%08x EDX=%08x\n"
  21            "ESI=%08x EDI=%08x EBP=%08x ESP=%08x\n"
  22            "EFL=%08x EIP=%08x\n",
  23            uc->uc_mcontext.gregs[EAX],
  24            uc->uc_mcontext.gregs[EBX],
  25            uc->uc_mcontext.gregs[ECX],
  26            uc->uc_mcontext.gregs[EDX],
  27            uc->uc_mcontext.gregs[ESI],
  28            uc->uc_mcontext.gregs[EDI],
  29            uc->uc_mcontext.gregs[EBP],
  30            uc->uc_mcontext.gregs[ESP],
  31            uc->uc_mcontext.gregs[EFL],
  32            uc->uc_mcontext.gregs[EIP]);
  33 }
  34
  35 void sig_handler(int sig, siginfo_t *info, void *puc)
  36 {
  37     struct ucontext *uc = puc;
  38
  39     printf("%s: si_signo=%d si_errno=%d si_code=%d si_addr=0x%08lx\n",
  40            strsignal(info->si_signo),
  41            info->si_signo, info->si_errno, info->si_code,
  42            (unsigned long)info->si_addr);
  43     dump_regs(uc);
  44     longjmp(jmp_env, 1);
  45 }
  46
  47 int v1;
  48
  49 int main(int argc, char **argv)
  50 {
  51     struct sigaction act;
  52     int i;
  53
  54     /* test division by zero reporting */
  55     if (setjmp(jmp_env) == 0) {
  56         act.sa_sigaction = sig_handler;
  57         sigemptyset(&act.sa_mask);
  58         act.sa_flags = SA_SIGINFO | SA_ONESHOT;
  59         sigaction(SIGFPE, &act, NULL);
  60
  61         /* now divide by zero */
  62         v1 = 0;
  63         v1 = 2 / v1;
  64     }
  65
  66     /* test illegal instruction reporting */
  67     if (setjmp(jmp_env) == 0) {
  68         act.sa_sigaction = sig_handler;
  69         sigemptyset(&act.sa_mask);
  70         act.sa_flags = SA_SIGINFO | SA_ONESHOT;
  71         sigaction(SIGILL, &act, NULL);
  72
  73         /* now execute an invalid instruction */
  74         asm volatile("ud2");
  75     }
  76
  77     /* test SEGV reporting */
  78     if (setjmp(jmp_env) == 0) {
  79         act.sa_sigaction = sig_handler;
  80         sigemptyset(&act.sa_mask);
  81         act.sa_flags = SA_SIGINFO | SA_ONESHOT;
  82         sigaction(SIGSEGV, &act, NULL);
  83
  84         /* now store in an invalid address */
  85         *(char *)0x1234 = 1;
  86     }
  87
  88     act.sa_handler = alarm_handler;
  89     sigemptyset(&act.sa_mask);
  90     act.sa_flags = 0;
  91     sigaction(SIGALRM, &act, NULL);
  92     alarm(1);
  93     for(i = 0;i < 2; i++) {
  94         sleep(1);
  95     }
  96     return 0;
  97 }