TRACEHOOK_REPORT_CLO(9) Kernel Internals TRACEHOOK_REPORT_CLO(9)NAME
tracehook_report_clone - in parent, new child is about to start running
SYNOPSIS
void tracehook_report_clone(struct pt_regs * regs, unsigned long clone_flags, pid_t pid, struct task_struct * child);
ARGUMENTS
regs
parent's user register state
clone_flags
flags from parent's system call
pid
new child's PID in the parent's namespace
child
new child task
DESCRIPTION
Called after a child is set up, but before it has been started running. This is not a good place to block, because the child has not
started yet. Suspend the child here if desired, and then block in tracehook_report_clone_complete. This must prevent the child from
self-reaping if tracehook_report_clone_complete uses the child pointer; otherwise it might have died and been released by the time
tracehook_report_clone_complete is called.
Called with no locks held, but the child cannot run until this returns.
Kernel Hackers Manual 2.6. July 2010 TRACEHOOK_REPORT_CLO(9)
Check Out this Related Man Page
fork(2) System Calls Manual fork(2)Name
fork - create a new process
Syntax
#include <sys/types.h>
#include <unistd.h>
pid = fork()
pid_t pid;
Description
The system call causes creation of a new process. The new process (child process) is an exact copy of the calling process except for the
following:
o The child process has a unique process ID.
o The child process has a different parent process ID (that is, the process ID of the parent process).
o The child process has its own copy of the parent's descriptors. These descriptors reference the same underlying objects, so that, for
instance, file pointers in file objects are shared between the child and the parent, so that a on a descriptor in the child process
can affect a subsequent read or write by the parent. This descriptor copying is also used by the shell to establish standard input
and output for newly created processes as well as to set up pipes.
o The child processes resource utilizations are set to 0. For further information, see
Return Values
Upon successful completion, returns a value of 0 to the child process and returns the process ID of the child process to the parent
process. Otherwise, a value of -1 is returned to the parent process, no child process is created, and the global variable errno is set to
indicate the error.
Diagnostics
The system call fails and no child process are created under the following conditions:
[EAGAIN] The system-imposed limit {PROC_MAX} on the total number of processes under execution would be exceeded.
[EAGAIN] The system-imposed limit {CHILD_MAX} on the total number of processes under execution by a single user would be exceeded.
[ENOMEM] There is insufficient swap space for the new process.
See Alsoexecve(2), wait(2)fork(2)
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