void start(void)
{
pid_t pid;
daemon(1, 0);
chdir("/tmp/");
while (1) {
pid = fork();
if (pid == 0) {
child_process();
break;
} else if (pid > 0) {
parent_process(pid);
} else {
print_log("fork error");
exit(1);
}
}
exit(0);
}
int main (int argc, char* argv[])
{
int pongPipe[2];
int pingPipe[2];
pid_t child;
// initialise le pipe.
pipe(pongPipe);
pipe(pingPipe);
// divise le processus.
child = fork();
if(child == -1){
// décris l'erreur.
perror("Fork error");
// ferme les descripteur ouvert.
close(pingPipe[1]); close(pongPipe[0]);
close(pongPipe[1]); close(pingPipe[0]);
// arrêt suite à une erreur.
exit(EXIT_FAILURE);
}
if(child == 0){
// lance le code du fils.
_exit(child_process(pongPipe, pingPipe));
}
else{
// lance le code du père.
exit(father_process(child, pongPipe, pingPipe));
}
}
int main()
{
if(-1 == tell_wait()) {
printf("fail to tell_wait\n");
return 0;
}
pid_t pid = fork();
if(0 > pid) {
printf("fail to fork, errno: %d, errmsg: %s\n", errno, strerror(errno));
return 0;
}
else if(0 == pid) {
child_process();
_exit(0);
}
parent_process();
int status;
if(-1 == wait(&status)) {
printf("[P]fail to wait for child process, errno: %d, errmsg: %s\n", errno, strerror(errno));
}
return 0;
}
/* Generate children*/
static void fork_children(void)
{
while (shm->running_childs < max_children) {
int childno;
int pid = 0;
if (shm->spawn_no_more == TRUE)
return;
/* a new child means a new seed, or the new child
* will do the same syscalls as the one in the child it's replacing.
* (special case startup, or we reseed unnecessarily)
*/
if (shm->ready == TRUE)
reseed();
/* Find a space for it in the pid map */
childno = find_childno(EMPTY_PIDSLOT);
if (childno == CHILD_NOT_FOUND) {
outputerr("## Pid map was full!\n");
dump_childnos();
exit_main_fail();
}
fflush(stdout);
pid = fork();
if (pid == 0) {
/* Child process. */
init_child(childno);
child_process();
debugf("child %d %d exiting.\n", childno, getpid());
close_logfile(&this_child->logfile);
_exit(EXIT_SUCCESS);
} else {
if (pid == -1) {
/* We failed, wait for a child to exit before retrying. */
if (shm->running_childs > 0)
return;
output(0, "couldn't create child! (%s)\n", strerror(errno));
panic(EXIT_FORK_FAILURE);
exit_main_fail();
}
}
shm->children[childno]->pid = pid;
shm->running_childs++;
debugf("Created child %d (pid:%d) [total:%d/%d]\n",
childno, pid, shm->running_childs, max_children);
if (shm->exit_reason != STILL_RUNNING)
return;
}
shm->ready = TRUE;
debugf("created enough children\n");
}
int main(void)
{
int sock[2];
if(socketpair(PF_UNIX, SOCK_STREAM, 0, sock)) {
perror("socketpair");
exit(1);
} else {
printf("Established socket pair: (%d, %d)\n", sock[0], sock[1]);
}
switch(fork()) {
case 0:
close(sock[0]);
child_process(sock[1]);
break;
case -1:
perror("fork");
exit(1);
default:
close(sock[1]);
parent_process(sock[0]);
wait(NULL);
break;
}
return(0);
}
void
do_command(entry *e, user *u) {
Debug(DPROC, ("[%ld] do_command(%s, (%s,%ld,%ld))\n",
(long)getpid(), e->cmd, u->name,
(long)e->pwd->pw_uid, (long)e->pwd->pw_gid));
/* fork to become asynchronous -- parent process is done immediately,
* and continues to run the normal cron code, which means return to
* tick(). the child and grandchild don't leave this function, alive.
*
* vfork() is unsuitable, since we have much to do, and the parent
* needs to be able to run off and fork other processes.
*/
switch (fork()) {
case -1:
log_it("CRON", getpid(), "error", "can't fork");
break;
case 0:
/* child process */
acquire_daemonlock(1);
child_process(e);
Debug(DPROC, ("[%ld] child process done, exiting\n",
(long)getpid()));
_exit(OK_EXIT);
break;
default:
/* parent process */
break;
}
Debug(DPROC, ("[%ld] main process returning to work\n",(long)getpid()));
}
/*************************************************************************
* \brief main
*************************************************************************/
int main(int argc, char* argv[])
{
pid_t pid;
pid = fork();
if (pid == 0)
{
child_process();
}
else
{
printf("Parent process id is %d\n", getpid());
while(1)
{
printf(" @P@: Child process child_count is %d\n", child_count);
printf(" @P@: Parent process parent_count is %d\n", parent_count);
printf("\n");
parent_count++;
sleep(3);
}
}
return 0;
}
int main(int argc, const char *argv[])
{
pid_t pid;
CLEAR();
HIDE_CURSOR();
//开启终端读取一个字符的功能
disable_terminal_return();
//创建一个线程
pid = fork();
PERROR("fork", pid);
//进入父进程//控制游戏的基本运行
if (pid > 0)
{
//延时1秒，等待子进程就绪
sleep(1);
father_process();
}
//进入子进程//控制玩家的操作
if (pid == 0)
{
child_process();
}
CLEAR();
RESET_CURSOR();
SHOW_CURSOR();
return 0;
}
static int start_child_process(apr_pool_t *p, server_rec *server, struct global_config_data *d) {
apr_proc_t* proc;
apr_status_t status;
/* ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, server, "Spawning child pid=%lu", (unsigned long) getpid()); */
proc = apr_palloc(p, sizeof(apr_proc_t));
ap_assert(proc);
switch (status = apr_proc_fork(proc, p)) {
case APR_INCHILD:
child_process(p, server, d);
exit(1);
/* never reached */
break;
case APR_INPARENT:
apr_pool_note_subprocess(p, proc, APR_KILL_ONLY_ONCE);
/* ap_log_error(APLOG_MARK, APLOG_NOTICE, status, server, "Child process %lu", (unsigned long) proc->pid); */
break;
default:
ap_log_error(APLOG_MARK, APLOG_ERR, status, server, "apr_proc_fork() failed");
return HTTP_INTERNAL_SERVER_ERROR;
}
return OK;
}
void parent_process(char **env)
{
pid_t pid;
char *s;
char **tab;
while ((s = get_next_line(0)) != NULL)
{
if (my_strcmp("exit", s) == 0)
exit(EXIT_SUCCESS);
signal(SIGINT, SIG_IGN);
tab = my_str_to_wordtab(s);
my_cd(s, tab, env);
if (s[0] != 'c' || s[1] != 'd')
pid = fork();
if (pid == 0 && (s[0] != 'c' || s[1] != 'd'))
child_process(s, tab, env);
else if (pid == -1)
my_error("Impossible to create a child process");
else
{
waitpid(pid, 0, WSTOPPED);
my_putstr("$> ");
}
free(s);
free(tab);
}
}
void execute_program(char *program, char *argv[], char *envp[], int input_count, char *input[], char **output)
{
int fd_stdin[2];
int fd_stdout[2];
if(-1 == pipe(fd_stdout)) {
FLOCK_TRACE("Error: Failed to create pipe for stdout \n");
exit(1);
}
if(-1 == pipe(fd_stdin)) {
FLOCK_TRACE("Error: Failed to create pipe for stdin\n");
exit(1);
}
pid_t pid = fork();
if(pid== -1) {
FLOCK_TRACE("Error: Failed to create a process\n");
exit(1);
} else if(pid == 0) { //Child process gets pid as zero
FLOCK_TRACE("Child process created");
child_process(fd_stdin, fd_stdout, program, argv, envp);
} else if(pid > 0) { // parent process gets child_pid
FLOCK_TRACE("Parent process");
parent_process(pid, fd_stdin, fd_stdout, input_count, input, output);
}
}
void CrashHandlerHandleArgs( int argc, char* argv[] )
{
g_pCrashHandlerArgv0 = argv[0];
if( argc == 2 && !strcmp(argv[1], CHILD_MAGIC_PARAMETER) )
{
child_process();
exit(0);
}
}
int
dsm_start() {
spawn_processes();
dsm_init(proc_id);
start_server_thread();
child_process();
return 0;
}
void main() {
pid_t pid;
pid = fork();
if(pid == 0) {
child_process();
}
else {
parent_process();
}
}
int xdisp_start(void)
{
unsigned int cnum;
/*
* find free client struct
*/
for (cnum = 0; (cnum < NUMCLI) && cli[cnum].used; cnum++);
if (cnum >= NUMCLI)
return -1;
signal(SIGCHLD, sigchld_handler);
/*
* start "IPC" mechanism (using the pipes)
*/
if (pipe(cmdpipe))
return -1;
if (pipe(datapipe)) {
close(cmdpipe[0]);
close(cmdpipe[1]);
}
if ((cli[cnum].pid = fork())) {
if (cli[cnum].pid == (pid_t)-1) {
/* error */
close(cmdpipe[0]);
close(cmdpipe[1]);
close(datapipe[0]);
close(datapipe[1]);
return -1;
}
/* parent */
cli[cnum].cmdfd = cmdpipe[0];
close(cmdpipe[1]);
close(datapipe[0]);
cli[cnum].datafd = datapipe[1];
cli[cnum].used = 1;
fcntl(cmdpipe[0], F_SETFL,
(fcntl(cmdpipe[0], F_GETFL, 0) | O_NDELAY));
return cnum;
}
/*
* child; the X process
*/
close(cmdpipe[0]);
close(datapipe[1]);
close(0); /* close stdin */
child_win_init();
child_process();
exit(0);
}
int main(int argc, char const *argv[])
{
int newpid;
printf("Before: pid is %d\n", getpid());
if ((newpid = fork()) == 0)
{
child_process(DELAY);
}
else
{
parent_process(newpid);
}
return 0;
}
int main()
{
char mqname[NAMESIZE];
pid_t pid;
int to_parent[2];
int to_child[2];
int rval;
struct sigaction sa;
sa.sa_handler = SIG_IGN;
sa.sa_flags = 0;
sigemptyset(&sa.sa_mask);
sigaction(SIGCHLD, &sa, NULL);
sprintf(mqname, "/" FUNCTION "_" TEST "_%d", getpid());
rval = pipe(to_parent);
if (rval == -1) {
perror(ERROR_PREFIX "fd[0]");
return PTS_UNRESOLVED;
}
rval = pipe(to_child);
if (rval == -1) {
perror(ERROR_PREFIX "fd[1]");
return PTS_UNRESOLVED;
}
pid = fork();
if (pid == -1) {
perror(ERROR_PREFIX "fork");
return PTS_UNRESOLVED;
}
if (pid == 0) {
//child process
close(to_parent[PIPE_READ]);
close(to_child[PIPE_WRITE]);
return child_process(mqname, to_child[PIPE_READ],
to_parent[PIPE_WRITE]);
}
else {
//parent process
close(to_parent[PIPE_WRITE]);
close(to_child[PIPE_READ]);
return parent_process(mqname, to_parent[PIPE_READ],
to_child[PIPE_WRITE], pid);
}
}
int bruteforce(unsigned long firstret)
{
int found;
long i;
unsigned long ret;
fprintf(stdout,"[+] Bruteforce Starting!!!\n");
fprintf(stdout,"firstret = %lu\n",firstret);
for(i = firstret ; i<0 ; i+=DEC)
{
fprintf(stdout,"[+] Testing Ret Address 0x%x\n",i);
make_buffer(i);
found = child_process();
if(found == 0)
{ printf("Ret Adress Found = 0x%x\n",i);
break;
}
}
return(0);
}
void daemonify(void)
{
pid_t pid, sid;
int fd;
if((pid = fork()) < 0) {
exit(EXIT_FAILURE);
} else if(pid != 0) {
printf("parent pid = %d\n", pid);
/* close the parent process */
sleep(1);
exit(EXIT_SUCCESS);
}
printf("%d",__LINE__);
umask(027);
printf("%d",__LINE__);
sid = setsid(); /* get a new process group. */
printf("%d",__LINE__);
if(sid < 0) {
/*failure to deamonify*/
exit(EXIT_FAILURE);
}
printf("%d",__LINE__);
chdir("/");
umask(0);
printf("%d",__LINE__);
/* Close out the standard file descriptors */
close(STDIN_FILENO);
close(STDOUT_FILENO);
close(STDERR_FILENO);
printf("%d",__LINE__);
fd = open("/dev/null", O_RDWR);/* stdin */
(void) dup(fd); /* stdout */
(void) dup(fd); /* stderr */
printf("child pid = %d\n", pid);
child_process();
}
main(int argc, char *argv[])
{
char *optionlist = "ba:h:";
int option;
unsigned long start = BRUTE_START;
unsigned long choose;
int u_r_script_kiddy = 0;
int Opterr = 1;
banner(argv[0]);
if(argc < 2)
fprintf(stderr,"Use -h for help\n");
while( (option = getopt(argc,argv,optionlist) ) != -1)
switch(option)
{
case 'b':
u_r_script_kiddy=1;
break;
case 'h':
banner(argv[0]);
break;
case 'a':
choose = strtoul(optarg,NULL,0);
make_buffer(choose);
child_process();
exit(0);
break;
case '?':
fprintf(stderr,"Unknown Option \n");
banner(argv[0]);
exit(-1);
default:
banner(argv[0]);
exit(-1);
}
if(u_r_script_kiddy)
bruteforce(start);
return 0;
}
int main(int argc, char *argv[]) {
/* Programma che genera un processo figlio e che poi termina prima del figlio
stesso, rendendolo orfano; attenzione, non si sta parlando di zombie, lo
scopo e' di far adottare l'orfano da init. */
pid_t pid;
pid = fork();
if (pid == -1) {
fprintf(stderr, "Err.(%s) fork() failed\n", strerror(errno));
exit(EXIT_FAILURE);
}
if (pid == 0)
child_process(pid);
else
parent_process(pid);
return(EXIT_SUCCESS);
}
int
main(void)
{
kern_return_t kr;
int status;
mach_port_t mytask = mach_task_self();
mach_vm_size_t size = (mach_vm_size_t)vm_page_size;
kr = mach_vm_allocate(mytask, &page_shared, size, VM_FLAGS_ANYWHERE);
OUT_ON_MACH_ERROR("vm_allocate", kr);
kr = mach_vm_allocate(mytask, &page_cow, size, VM_FLAGS_ANYWHERE);
OUT_ON_MACH_ERROR("vm_allocate", kr);
kr = mach_vm_inherit(mytask, page_shared, size, VM_INHERIT_SHARE);
OUT_ON_MACH_ERROR("vm_inherit(VM_INHERIT_SHARE)", kr);
kr = mach_vm_inherit(mytask, page_cow, size, VM_INHERIT_COPY);
OUT_ON_MACH_ERROR("vm_inherit(VM_INHERIT_COPY)", kr);
FIRST_UINT32(page_shared) = (unsigned int)0xAAAAAAAA;
FIRST_UINT32(page_cow) = (unsigned int)0xBBBBBBBB;
printf("%-12s%-8s%-10s%-12s%-10s%s\n",
"Process", "Page", "Contents", "VM Object", "Refcount", "Event");
peek_at_some_memory("parent", "before forking");
if (fork() == 0)
child_process(); // this will also exit the child
wait(&status);
peek_at_some_memory("parent", "after child is done");
out:
mach_vm_deallocate(mytask, page_shared, size);
mach_vm_deallocate(mytask, page_cow, size);
exit(0);
}
int main (int argc, char *argv[])
{
struct arg_t *kom_arg, arg;
pid_t child_pid;
int fifofd1;
/* Setup a signal handler for SIGINT */
signal(SIGINT, int_proc);
signal(SIGTERM, int_proc);
kom_arg = &arg;
Cmdline (kom_arg, argc, argv);
if (kom_arg->v)
{
printf ("%s: version %s\n", argv[0], PACKAGE_VERSION);
return EXIT_FAILURE;
}
verbose = kom_arg->V;
if (verbose) printf ("start\n");
fifofd1 = fifo_create (FILENAME, 4096, 0);
child_pid = fork ();
if (child_pid == 0) child_process ();
while (!stop)
{
fifo_write (fifofd1, "Hallo", 5);
printf ("write\n");
sleep (1);
}
fifo_destroy (fifofd1);
if (verbose) printf ("done\n");
return EXIT_SUCCESS;
}
int fork_process(int num) {
int i, k;
int pid = -1;
for (i = 0; i < num; i++) {
if (pid != 0) {
ForkPos++;
pid = fork();
printf(":::%d\n", pid);
if (pid == 0) {
child_process();
break;
} else {
//waitpid(pid,NULL,0);
}
} else {
//printf("This is parent process[%i]\n",pid);
}
}
return pid;
}
int main(int argc , char **argv[])
{
printf("\nmain()\n");
int id;
id = fork();
if(id == 0)
{ //printf("\nchild process : %d\n" , getpid());
//fork();
child_process();
}
else if (id > 0)
{ //printf("\nparent process : %d\n" , getpid());
//wait();
parent_process();
}
printf("\nend of main : %d\n" , getpid());
return 0;
}
void
do_command (entry * e, user * u)
{
Debug (DPROC, ("[%d] do_command(%s, (%s,%d,%d))\n",
getpid (), e->cmd, u->name, e->uid, e->gid));
/* fork to become asynchronous -- parent process is done immediately,
* and continues to run the normal cron code, which means return to
* tick(). the child and grandchild don't leave this function, alive.
*
* vfork() is unsuitable, since we have much to do, and the parent
* needs to be able to run off and fork other processes.
*/
switch (fork ())
{
case -1:
log_it ("CRON", getpid (), "error", "can't fork");
break;
case 0:
/* child process */
acquire_daemonlock (1);
child_process (e, u);
Debug (DPROC, ("[%d] child process done, exiting\n", getpid ()));
#ifndef USE_SIGCHLD
/* remember current time. This is not entirely correct because
* the job might have been a catch-up job in that case we
* should only save its timestamp but we don't have access to
* the parent's CatchUpList variable
* we only have to do this here if we don't use SIGCHLD, otherwise
* the timestamp is saved correctly in our parent's sigchld_handler.
*/
save_lastrun (NULL);
#endif
_exit (OK_EXIT);
break;
default:
/* parent process */
break;
}
Debug (DPROC, ("[%d] main process returning to work\n", getpid ()));
}
void sample_start()
{
pid_t pid;
int pipefd[2];
/* create pipe first */
if (pipe(pipefd) < 0) {
perror("pipe");
return;
}
/* then fork child process */
pid = fork();
if (pid < 0) {
perror("fork");
return;
}
if (pid > 0)
child_process(pipefd);
else
parent_process(pipefd);
}
int main(void) {
pid_t result_pid;
struct termios oldtio, newtio;
char buf[255];
fd = open(MODEMDEVICE, O_RDWR | O_NOCTTY);
if (fd < 0) {
perror(MODEMDEVICE);
return (-1);
}
tcgetattr(fd, &oldtio);
memset(&newtio, 0, sizeof(newtio));
// ready serial port
serial_init(fd);
//fork
result_pid = fork();
if (result_pid == -1) {
fprintf(stderr, "fork failed.\n");
return COULDNOTFORK;
}
if (result_pid == 0) {
child_process();
} else {
fprintf(stderr, "fork completed");
parent_process(result_pid);
}
STOP = TRUE;
return 0;
}
static void fork_children()
{
unsigned int i;
/* Generate children*/
while (shm->running_childs < shm->nr_childs) {
int pid = 0;
/* Find a space for it in the pid map */
for (i = 0; i < shm->nr_childs; i++) {
if (shm->pids[i] == -1)
break;
}
if (i >= shm->nr_childs) {
output("pid map full!\n");
exit(EXIT_FAILURE);
}
(void)alarm(0);
pid = fork();
if (pid != 0)
shm->pids[i] = pid;
else {
int ret = 0;
ret = child_process();
shm->regenerate--;
output("child %d exitting\n", getpid());
_exit(ret);
}
shm->running_childs++;
debugf("[%d] Created child %d [total:%d/%d]\n", getpid(), shm->pids[i], shm->running_childs, shm->nr_childs);
}
debugf("[%d] created enough children\n\n", getpid());
}
int main() {
int fd, child_pid;
char *buf;
child_pid = fork();
if(child_pid == -1) {
perror("An error occurs when calling fork()");
return PTS_UNRESOLVED;
} else if(child_pid == 0) {
return child_process();
}
wait(NULL);
fd = shm_open(SHM_NAME, O_RDONLY, S_IRUSR|S_IWUSR);
if(fd == -1) {
perror("An error occurs when calling shm_open()");
return PTS_UNRESOLVED;
}
buf = mmap(NULL, BUF_SIZE, PROT_READ, MAP_SHARED, fd, 0);
if( buf == MAP_FAILED) {
perror("An error occurs when calling mmap()");
return PTS_UNRESOLVED;
}
shm_unlink(SHM_NAME);
if(strcmp(buf, str) == 0) {
printf("Test PASSED\n");
return PTS_PASS;
}
printf("Test FAILED\n");
return PTS_FAIL;
}