struct ProcChild *
proc_fork(void (*child_func)(void), const char *desc)
{
pid_t pid;
int fdr[2], fdw[2];
pipe(fdr);
pipe(fdw);
pid = fork();
if (pid == -1) return NULL;
if (pid == 0) {
// new child process starts
close(fdw[1]);
close(fdr[0]);
memset(&my_proc, 0, sizeof(struct Proc));
my_proc.parent.from = fdw[0];
my_proc.parent.to = fdr[1];
my_proc.parent.pid = getppid();
my_proc.desc = desc;
handle_signals();
log_debug(LOG_PROC, "%s process %d started\n", desc, getpid());
child_func();
proc_finish();
while (1) {} // to keep gcc happy
} else {
// parent process continues
close(fdw[0]);
close(fdr[1]);
return add_child(pid, fdw[1], fdr[0], desc);
}
}
static int test_child(int (*child_func) (void))
{
struct stat st1, st2;
int r;
/* make sure we don't propagate mounts back to the parent */
r = mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL);
assert(r >= 0);
r = stat(b1_mountpath, &st1);
assert(r >= 0);
/* mount fresh domain */
r = mount(b1_filesystem,
b1_mountpath,
b1_filesystem,
MS_NOSUID | MS_NOEXEC | MS_NODEV,
NULL);
assert(r >= 0);
r = stat(b1_mountpath, &st2);
assert(r >= 0);
/* new domain must not equal parent domain */
assert(st1.st_dev != st2.st_dev);
return child_func();
}
/* To open and start new
* python shell process
*/
gboolean
ptyFork (ChildProcessData *python_shell_data, GError **error)
{
int mfd, slaveFd, savedErrno;
mfd = posix_openpt (O_RDWR | O_NOCTTY | O_NONBLOCK);
grantpt (mfd);
unlockpt (mfd);
python_shell_data->master_fd = mfd;
python_shell_data->slave_name = g_strdup (ptsname (mfd));
python_shell_data->sh_argv = g_malloc0 (sizeof (gchar *));
python_shell_data->sh_argv[0] = g_strdup ("/bin/sh");
/*if (!g_spawn_async (python_shell_data->current_dir, python_shell_data->argv, NULL, 0,
child_func, (gpointer)python_shell_data,
&(python_shell_data->pid), error))
return FALSE;*/
pid_t childPid = fork ();
if (childPid == 0)
{
child_func ((gpointer)python_shell_data);
execv (python_shell_data->sh_argv [0], python_shell_data->sh_argv);
}
python_shell_data->pid = childPid;
return TRUE;
}
void test_setup(int i, char *argv0)
{
char nobody_uid[] = "nobody";
struct passwd *ltpuser;
switch (i) {
case 0:
break;
case 1:
header.version = _LINUX_CAPABILITY_VERSION;
header.pid = 0;
break;
case 2:
header.version = INVALID_VERSION;
header.pid = 0;
break;
case 3:
header.version = _LINUX_CAPABILITY_VERSION;
/*
* when a non-zero pid is specified, process should have
* CAP_SETPCAP capability to change capabilities.
* by default, CAP_SETPCAP is not enabled. So giving
* a non-zero pid results in capset() failing with
* errno EPERM
*
* Note: this seems to have changed with recent kernels
* => create a child and try to set its capabilities
*/
child_pid = FORK_OR_VFORK();
if (child_pid == -1)
tst_brkm(TBROK | TERRNO, cleanup, "fork failed");
else if (child_pid == 0) {
#ifdef UCLINUX
if (self_exec(argv0, "") < 0) {
perror("self_exec failed");
exit(1);
}
#else
child_func();
#endif
} else {
header.pid = child_pid;
ltpuser = getpwnam(nobody_uid);
if (ltpuser == NULL)
tst_brkm(TBROK | TERRNO, cleanup,
"getpwnam failed");
if (seteuid(ltpuser->pw_uid) == -1)
tst_brkm(TBROK | TERRNO, cleanup,
"seteuid failed");
}
break;
}
}
/** The main function reads command line arguments, opens
* the log and forks the child process.
*/
int
main(int argc, char** argv)
{
int pid;
char *infilename, *outfilename;
FILE *infile, *outfile;
sigset_t ss;
infile = NULL;
outfile = NULL;
if (argc < 3 || argc > 4) {
print_usage();
exit(-1);
}
infilename = argv[1];
outfilename = argv[2];
if (argc > 3) {
if ((logfile = fopen(argv[3], "w")) == NULL) {
perror("unable to open logfile");
print_usage();
exit(-1);
}
} else logfile = stdout;
fprintf(logfile, "%ld: log opened\n", (long int)time(NULL));
/** Create a blocking sigprocmask for the morse code signals so
* that the blocked signals can be caught with sigtimedwait
* instead of the signal handler
* */
sigemptyset(&ss);
sigaddset(&ss, MORSE_SHORT);
sigaddset(&ss, MORSE_LONG);
sigaddset(&ss, MORSE_PAUSE);
sigprocmask(SIG_BLOCK, &ss, NULL);
/* Fork the child process */
if ((pid = fork()) < 0){
perror("fork error");
exit(-1);
}
if (pid == 0) {
/* In child */
child_func(infilename,infile);
fflush(logfile);
fclose(logfile);
}
else {
/* In parent */
parent_func(outfilename, outfile, pid);
fflush(logfile);
fclose(logfile);
}
return 0;
}
struct ProcChild *
proc_fork(void (*child_func)(void), const char *desc)
{
pid_t pid;
int fdr[2], fdw[2];
int i;
pipe(fdr);
pipe(fdw);
pid = fork();
if (pid == -1) return NULL;
if (pid == 0) {
// new child process starts
// we have to close unneeded pipes inherited from the parent
if (my_proc.parent.to != -1) close(my_proc.parent.to);
if (my_proc.parent.from != -1) close(my_proc.parent.from);
for (i = 0; i < my_proc.nr_children; i++) {
close(my_proc.children[i].to);
close(my_proc.children[i].from);
}
close(fdw[1]);
close(fdr[0]);
// stop parent's pipes from propagating through an exec()
fcntl(fdw[0], F_SETFD, FD_CLOEXEC);
fcntl(fdr[1], F_SETFD, FD_CLOEXEC);
// now setup our own data
memset(&my_proc, 0, sizeof(struct Proc));
my_proc.parent.from = fdw[0];
my_proc.parent.to = fdr[1];
my_proc.parent.pid = getppid();
my_proc.desc = desc;
handle_signals();
set_my_name(desc);
log_debug(LOG_PROC, "%s process %d started\n", desc, getpid());
// finally jump to the real function
child_func();
proc_finish();
while (1) {} // to keep gcc happy
} else {
// parent process continues
close(fdw[0]);
close(fdr[1]);
return add_child(pid, fdw[1], fdr[0], desc);
}
}
static void test(void)
{
pid_t pid;
int status;
/* unshares the network namespace */
if (unshare(CLONE_NEWNET) == -1)
tst_brkm(TBROK | TERRNO, cleanup, "unshare failed");
pid = tst_fork();
if (pid < 0) {
tst_brkm(TBROK | TERRNO, cleanup, "fork failed");
}
if (pid == 0) {
_exit(child_func());
}
/* creates TAP network interface dummy0 */
if (WEXITSTATUS(system("ip tuntap add dev dummy0 mode tap")) == -1)
tst_brkm(TBROK | TERRNO, cleanup, "system failed");
/* removes previously created dummy0 device */
if (WEXITSTATUS(system("ip tuntap del mode tap dummy0")) == -1)
tst_brkm(TBROK | TERRNO, cleanup, "system failed");
/* allow child to continue */
TST_SAFE_CHECKPOINT_WAKE(cleanup, 0);
SAFE_WAITPID(cleanup, pid, &status, 0);
if (WIFEXITED(status) && WEXITSTATUS(status) != 0) {
tst_resm(TFAIL, "netlink interface fail");
return;
}
if (WIFSIGNALED(status)) {
tst_resm(TFAIL, "child was killed with signal %s",
tst_strsig(WTERMSIG(status)));
return;
}
tst_resm(TPASS, "netlink interface pass");
}
int main(int argc, char *argv[])
{
int nchildren = 1;
int pid;
int x;
if (argc > 1) {
nchildren = atoi(argv[1]);
}
for (x = 0; x < nchildren; x++) {
if ((pid = fork()) == 0) {
child_func(x + 1);
exit(0);
}
}
wait(NULL);
return 0;
}
static int fork_and_wait_child (void (*child_func) (void))
{
pid_t pid;
int status;
pid = fork ();
ATF_REQUIRE (pid != -1);
if (pid == 0)
{
status = 0; /* Silence compiler warnings */
child_func ();
UNREACHABLE;
}
else
{
ATF_REQUIRE (waitpid (pid, &status, 0) != 0);
}
return status;
}
static int create_child_and_init_lib(int n, Prolib_t *lib, void(*child_func)(int numth, Prolib_t *lib))
{
int i;
pid_t pid;
for (i = 0; i < n; i++)
{
pid = fork();
if (-1 == pid )
{
perror("fork");
return -1;
}
if (0 == pid)
{
lib[i].pid = getpid();
child_func(i, lib);
exit(0);
}
}
return 0;
}
void parent_func()
{
int parent_var;
child_func(&parent_var);
}
int child_func(void)
{
int i, fd;
struct timespec ts = {.tv_sec = 0, .tv_nsec = 0};
int msec = 0;
sleep(1);
srand(time(NULL));
for (i=0; i<NLOOP; i++) {
sprintf(name, SHM_NAME, i);
fd = shm_open(name, O_RDONLY|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR);
if (fd != -1)
{
sem_wait(sem);
//fprintf(stderr, "%d: %d\n", getpid(), *create_cnt);
(*create_cnt)++;
sem_post(sem);
}
/* get a random number [0, 20] */
msec = (int) (20.0 * rand() / RAND_MAX) ;
ts.tv_nsec = msec * 1000000;
nanosleep(&ts, NULL);
}
return 0;
}
int main() {
int i, pid, result_fd;
char semname[20];
snprintf(semname, 20, "/sem23-1_%d", getpid());
sem = sem_open(semname, O_CREAT, 0777, 1);
if (sem == SEM_FAILED || sem == NULL) {
perror("error at sem_open");
return PTS_UNRESOLVED;
}
sem_unlink(semname);
result_fd = shm_open(SHM_RESULT_NAME,
O_RDWR|O_CREAT,
S_IRUSR|S_IWUSR);
if (result_fd == -1) {
perror("An error occurs when calling shm_open()");
return PTS_UNRESOLVED;
}
shm_unlink(SHM_RESULT_NAME);
if (ftruncate(result_fd, sizeof(*create_cnt)) != 0) {
perror("An error occurs when calling ftruncate()");
shm_unlink(SHM_RESULT_NAME);
return PTS_UNRESOLVED;
}
create_cnt = mmap(NULL, sizeof(*create_cnt), PROT_WRITE,
MAP_SHARED, result_fd, 0);
if (create_cnt == MAP_FAILED) {
perror("An error occurs when calling mmap()");
shm_unlink(SHM_RESULT_NAME);
return PTS_UNRESOLVED;
}
*create_cnt = 0;
for (i=0; i<NPROCESS; i++) {
pid = fork();
if (pid == -1) {
perror("An error occurs when calling fork()");
return PTS_UNRESOLVED;
} else if (pid == 0) {
child_func();
exit(0);
}
}
while (wait(NULL) > 0);
for (i=0; i<NLOOP; i++) {
sprintf(name, SHM_NAME, i);
shm_unlink(name);
}
fprintf(stderr, "create_cnt: %d\n", *create_cnt);
if (*create_cnt != NLOOP) {
printf("Test FAILED\n");
return PTS_FAIL;
}
return PTS_PASS;
}
static int
test_sig(void (*child_func)(void), int expected_sig, int expected_code)
{
int code, term_sig;
int child_pid;
int wstatus;
int rc;
child_pid = fork();
if (child_pid < 0) {
printf("fork() failed\n");
return 1;
}
if (!child_pid) {
child_func();
exit(0);
}
rc = waitpid(-1, &wstatus, 0);
if (rc != child_pid) {
printf("waitpid returned %d instead of child's pid: %d\n", rc, child_pid);
return 1;
}
code = WEXITSTATUS(wstatus);
term_sig = WTERMSIG(wstatus);
if (expected_sig > 0) {
if (code != 0) {
printf("ERROR: expected child to exit with 0, got: %d\n", code);
return 1;
}
if (term_sig != expected_sig) {
printf("ERROR: expected child exit due to signal "
"%d, instead got terminated by: %d\n", expected_sig, term_sig);
return 1;
}
printf("The child exited with signal %d, as expected.\n", expected_sig);
} else {
if (term_sig != 0) {
printf("ERROR: expected child to exit with code %d, "
"it got terminated with signal: %d\n", expected_code, term_sig);
return 1;
}
if (code != expected_code) {
printf("ERROR: expected child exit with "
"code %d, got: %d\n", expected_code, code);
return 1;
}
printf("The child exited with code %d, as expected.\n", expected_code);
}
return 0;
}
int main(int argc, char *argv[])
{
sem_t *sem_mutex; //Binary semaphore to use a mutex
int *stateptr; //Shared memory global int to store active button state
int hit_count = 0, rows, cols;
WINDOW *mainwin = NULL;
int nextch;
MEVENT event;
struct sigaction act;
//Create a binary semaphore to use as a mutex:
//(will be inerited by children)
if ((sem_mutex = sem_open("/mutex", O_CREAT|O_EXCL, 0600, 1)) == SEM_FAILED) {
perror("Semaphore creation failed");
return EXIT_FAILURE; }
//Now unlink semaphore so it will be deleted in case of ^-C or crash:
sem_unlink("/mutex");
//Setup anonymous, shared memory for global int:
if ((stateptr = mmap(NULL, sizeof(int), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0)) == MAP_FAILED) {
perror("Shared memory creation failed");
return EXIT_FAILURE; }
//Initialize button state (no active buttons):
*stateptr = 0;
//Initialize and setup the curses window:
if ((mainwin = initscr()) == NULL) {
fprintf(stderr,"Failed to initialize curses window\n");
return EXIT_FAILURE; }
getmaxyx(mainwin,rows,cols);
mvprintw(rows/2,cols/2-18,"Click on the Corner Buttons to Score!",rows,cols);
mvprintw(rows/2+2,cols/2-10,"(rows: %d cols: %d)",rows,cols);
refresh();
//Setup signal handler for SIGCHLD signals:
memset(&act,0,sizeof(act));
act.sa_handler = sigchld_handler;
sigemptyset(&act.sa_mask);
sigaction(SIGCHLD,&act,NULL);
//Create children:
//****************
for (int i=0; i < running; i++){//memory problem???
switch(fork()){
case -1:
perror("fork failed");
sigchld_handler(EXIT_FAILURE);
endwin();//put this in here since failures don't close the window apparently.
exit(EXIT_FAILURE);
case 0:
child_func(1+i, rows, cols,sem_mutex,stateptr);//1+processcount allows for proper numbering.
sigchld_handler(EXIT_SUCCESS);
exit(EXIT_SUCCESS);
default:
break;//no break leads to error apparently.
//I got it now the switch statement will determine the parent function follows the default.
}
}
//Setup curses to get mouse events:
keypad(mainwin, TRUE);
mousemask(ALL_MOUSE_EVENTS, NULL);
//Loop catching mouse clicks while children are running:
while (running > 0) {
//nextch = wgetch(mainwin);
if ((nextch = getch()) == KEY_MOUSE && getmouse(&event) == OK && (event.bstate & BUTTON1_PRESSED)) {
//Check if user clicked on a label:
if (check_click(*stateptr, event.x, event.y, rows, cols)) {
//Clicked on current label:
hit_count++;
mvprintw(rows/2+5,cols/2-11,"Got #%d at (%3d,%3d)",*stateptr,event.x,event.y);
wrefresh(curscr); //Need this to ensure entire screen is redrawn despite child changes.
} }
}
//Close curses window so terminal settings are restored to normal:
endwin();
//Print out results:
printf("\nYour hit count was: %d\n\n",hit_count);
//Collect all the children:
//*************************
//return exit success if child successfully exited.
int status;
int tempcount = 0;//made a temp count since I think running will be 0 by now.
while(tempcount<4){
wait(&status);// wait for children shouldn't all return status
if(WIFEXITED(status) && WEXITSTATUS(status) == EXIT_SUCCESS){
tempcount++;//increment temp count.
}else
exit(EXIT_FAILURE);//return exit failure according to lecture.
}
exit(EXIT_SUCCESS);//completes while loop so returns exit success.
}
