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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <semaphore.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <assert.h>
#include "semconfig.h"
#include "../src/ui_ipc.h"
int main(int argc, char **argv) {
int ret, c_status;
pid_t child;
ret = ui_ipc_init(1);
ret |= ui_ipc_sempost(SEM_UI);
ret |= ui_ipc_sempost(SEM_UI);
assert(ui_ipc_getvalue(SEM_UI) == 2);
if ( (child = fork()) == 0 ) {
printf("child: wait (%d)\n", ui_ipc_getvalue(SEM_UI));
ret |= ui_ipc_semtrywait(SEM_UI);
assert(ui_ipc_getvalue(SEM_UI) == 1);
ret |= ui_ipc_semtrywait(SEM_UI);
assert(ui_ipc_getvalue(SEM_UI) == 0);
ret |= ui_ipc_semwait(SEM_UI);
printf("child: done (%d)\n", ui_ipc_getvalue(SEM_UI));
ret |= ui_ipc_sempost(SEM_UI);
exit( (ret == 0 ? 0 : ret) );
} else if (child > 0) {
usleep(100000);
printf("parent: post (%d)\n", ui_ipc_getvalue(SEM_UI));
ui_ipc_sempost(SEM_UI);
} else {
ret |= 1;
}
wait(&c_status);
ret |= ui_ipc_semtrywait(SEM_UI);
ui_ipc_free(1);
exit( c_status | ret );
}
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