I think Wes' mail client mangled his testcase a bit. Here is a cleaned
up version.
Compile with:
% gcc -Wall -Werror alarm.c -o alarm
Output on 2.4 kernel is:
% ./alarm
[1058193354] alarm(0), want retval:0; got retval:0 (PASS)
...
[1058193354] alarm(9), want retval:8; got retval:8 (PASS)
0/10 tests failed
Output on 2.5 kernel is: many failures. The number of failures go down
when the system is heavily stressed.
---- Begin alarm.c ----
#include <unistd.h>
#include <stdio.h>
#include <sys/time.h>
#define MINVAL 0
#define MAXVAL 10
#define NOALARM 0
int main(int argc, char **argv)
{
int retval = 0, failed = 0, tests = MAXVAL, prev = 0, curr = 0;
struct timeval time;
if (argc > 1)
if (sscanf(argv[1], "%d", &tests) != 1)
return 1;
for (curr = MINVAL; curr < tests; curr++) {
retval = alarm(curr);
gettimeofday(&time, NULL);
printf("[%li] alarm(%d), want retval:%d; ",
time.tv_sec, curr, prev);
/* was there a previous alarm? */
if (retval == NOALARM && prev == NOALARM) {
printf("got retval:0 (PASS)");
} else if (retval == NOALARM && prev > NOALARM) {
printf("got retval:0 (FAIL)");
failed++;
} else if (retval != prev) {
printf("got retval:%d (FAIL)", retval);
failed++;
} else {
printf("got retval:%d (PASS)", retval);
}
printf("\n");
prev = curr;
}
printf("%d/%d tests failed\n", failed, tests);
return failed;
}
---- End alarm.c ----
-
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This archive was generated by hypermail 2b29 : Wed Jul 23 2003 - 22:00:31 EST