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#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
#include <math.h>
#define ROUNDS 20
#define SWAPS 40
int max_error = 5;
#include "common.h"
int pipefdc[2];
int pipefdp[2];
int subtest = 0;
int child_is_dead = 0;
void dead_child(int n);
void do_child(void);
void do_parent(void);
void do_calcs(void);
void err(int n);
void quit(void);
void err(int n)
{
e(n);
}
void do_calcs(void)
{
float a, b, c, d, e;
float foo, bar;
int i;
subtest = 3;
a = 1.1;
b = 2.2;
c = 3.3;
d = 4.4;
e = 5.5;
foo = a * b; /* 2.42 */
bar = c * d; /* 14.52 */
i = 0;
while(i < ROUNDS) {
foo += c; /* 5.72 */
foo *= d; /* 25.168 */
foo /= e; /* 4.5760 */
bar -= a; /* 13.42 */
bar *= b; /* 29.524 */
bar /= e; /* 5.3680 */
/* Undo */
foo *= e;
foo /= d;
foo -= c;
bar *= e;
bar /= b;
bar += a;
i++;
}
if (fabs(foo - (a * b)) > 0.0001) err(1);
if (fabs(bar - (c * d)) > 0.0001) err(2);
}
void dead_child(int n)
{
int status;
subtest = 4;
(void) n; /* Avoid warning about unused parameter */
if (wait(&status) == -1) err(1);
if (!WIFEXITED(status)) {
err(2);
quit();
} else {
errct += WEXITSTATUS(status);
child_is_dead = 1;
}
}
void do_child(void)
{
char buf[2];
int s;
s = 0;
close(pipefdp[0]);
close(pipefdc[1]);
while(s < SWAPS) {
do_calcs();
/* Wake up parent */
write(pipefdp[1], buf, 1);
/* Wait for parent to wake me up */
read(pipefdc[0], buf, 1);
s++;
}
exit(0);
}
void do_parent(void)
{
int s;
char buf[2];
struct sigaction sa;
subtest = 2;
sa.sa_handler = dead_child;
sa.sa_flags = 0;
if (sigaction(SIGCHLD, &sa, NULL) == -1) err(1);
s = 0;
close(pipefdp[1]);
close(pipefdc[0]);
while(s < SWAPS) {
/* Wait for child to wake me up */
read(pipefdp[0], buf, 1);
do_calcs();
/* Wake up child */
write(pipefdc[1], buf, 1);
s++;
}
while(child_is_dead == 0) { fflush(stdout); } /* Busy wait */
quit();
}
int main(void)
{
pid_t r;
subtest = 1;
start(52);
if (pipe(pipefdc) == -1) err(1);
if (pipe(pipefdp) == -1) err(2);
r = fork();
if(r < 0) {
err(3);
} else if(r == 0) {
/* Child */
do_child();
} else {
/* Parent */
do_parent();
}
return(0); /* Never reached */
}
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