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/* See LICENSE file for copyright and license details. */
#include "common.h"
static struct process head;
static struct process tail;
void
init_process_list(void)
{
head.next = &tail;
tail.prev = &head;
}
struct process *
find_process(pid_t pid)
{
struct process *p;
for (p = head.next; p->next; p = p->next)
if (p->pid == pid)
return p;
return NULL;
}
struct process *
add_process(pid_t pid, unsigned long int trace_options)
{
struct process *proc;
int saved_errno;
proc = calloc(1, sizeof(*proc));
if (!proc)
eprintf("calloc: %s\n");
proc->pid = pid;
if (waitpid(pid, NULL, 0) < 0) {
eprintf("waitpid <child> NULL 0:");
kill(pid, SIGKILL);
exit(1);
}
if (ptrace(PTRACE_SETOPTIONS, pid, 0, trace_options)) {
saved_errno = errno;
kill(pid, SIGKILL);
errno = saved_errno;
eprintf("ptrace PTRACE_SETOPTIONS %ju 0 ...:", (uintmax_t)pid);
}
if (ptrace(PTRACE_SYSCALL, pid, NULL, 0))
eprintf("ptrace PTRACE_SYSCALL %ju NULL 0:", (uintmax_t)pid);
proc->next = &tail;
proc->prev = tail.prev;
proc->prev->next = proc;
tail.prev = proc;
return proc;
}
void
remove_process(struct process *proc)
{
proc->prev->next = proc->next;
proc->next->prev = proc->prev;
if (proc->vfork_waiting_on)
proc->vfork_waiting_on->continue_on_exit = NULL;
if (proc->continue_on_exit)
proc->continue_on_exit->vfork_waiting_on = NULL;
free(proc);
}
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