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added segfault testing

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This commit is contained in:
David Schleef 2001-01-23 18:21:47 +00:00
parent 91f2dd824b
commit 8265dded62
1 changed files with 52 additions and 2 deletions
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54
testing/mmap.c
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@ -11,8 +11,15 @@
#include <sys/time.h>
#include <string.h>
#include <sys/mman.h>
#include <signal.h>
#include <setjmp.h>
#include <stdlib.h>
#include "comedi_test.h"
/* XXX this should come from elsewhere */
#define PAGE_SIZE 4096
static int comedi_get_cmd_fast_1chan(comedi_t *it,unsigned int s,comedi_cmd *cmd);
#define N_SAMPLES 10000
@ -21,17 +28,48 @@ static int comedi_get_cmd_fast_1chan(comedi_t *it,unsigned int s,comedi_cmd *cmd
#define MAPLEN 20480
jmp_buf jump_env;
void segv_handler(int num,siginfo_t *si,void *x)
{
longjmp(jump_env,1);
}
int test_segfault(void *memptr)
{
volatile char tmp;
int ret;
ret=setjmp(jump_env);
if(!ret) tmp = *((char *)(memptr));
return ret;
}
void setup_segfaulter(void)
{
struct sigaction act;
memset(&act,0,sizeof(act));
act.sa_sigaction=&segv_handler;
act.sa_flags = SA_SIGINFO;
sigaction(SIGSEGV,&act,NULL);
}
int test_mmap(void)
{
comedi_cmd cmd;
char buf[BUFSZ];
char *buf;
unsigned int chanlist[1];
int go;
int total=0;
int ret;
void *b;
void *b, *adr;
sampl_t *map;
setup_segfaulter();
buf=malloc(BUFSZ);
if(comedi_get_cmd_fast_1chan(device,subdevice,&cmd)<0){
printf(" not supported\n");
return 0;
@ -43,6 +81,16 @@ int test_mmap(void)
return 0;
}
/* test readability */
for(adr=map;adr<(void *)map+MAPLEN;adr+=PAGE_SIZE){
ret=test_segfault(adr);
if(ret){
printf("E: %p failed\n",adr);
}else{
printf("%p ok\n",adr);
}
}
cmd.chanlist = chanlist;
cmd.scan_end_arg = 1;
cmd.stop_arg = N_SAMPLES;
@ -77,6 +125,8 @@ int test_mmap(void)
}
munmap(map,MAPLEN);
free(buf);
return 0;
}