Option 1: fork twice (pseudocode)
Option 2: remember how many forks you've done in an array (no guarantee on correctness):
Personally, I think the first one is better in terms of readability.
Hello all.
I'm developing a filetransfer application, which is supposed to work sort of like dcc, with multiple transfers etc. Now i wonder what the best way to manage the transfers is. Should i fork() for each new transfer, hogging loads of memory or use pthreads? Maybe I can use select to see... (0 Replies)
hi all
About this code
for (i = 1; i < n; i++)
if ((childpid = fork()) <= 0)
break;
I really can't understand the output .
and the way fork () return the value .
how about the process Id ,the child process Id and the parent ID
in this case
so please answer me soon (5 Replies)
Hi everybody,
I wanna write a code to understand how fork works.
my target
--------------
-Parent creates a file(called temp) and writes into this file "1".Then it closes the file.
-Then parent creates a child and wait until execution of this child ends.
-Then child opens the same... (3 Replies)
I have never coded in perl before (just started today morning :). I need to write a perl program to automate a task.
Here is how I do it manually:
Start a program in my home dir. Now if I want to execute another program while this one is still running, what I would do is go to another... (6 Replies)
I'm trying to run a simple test on how to use fork(), i'm able to execute the child process first then the parent, but how can I execute parent then child..?
Thanks! (1 Reply)
Hi,
I have a file which has some 50 hosts, I want to login to each host using ssh and execute any command. I am using fork function in perl. I am able to login to each host and execute the command in the hosts paralelly, but it spawing/forking 50 processes at a time.
It will consume the cpu... (5 Replies)
I understand that fork create a child but I need very simple example that make child useful....
I mean how will make the program faster anyone explain with code plz
using C plz (2 Replies)
Hi,
I am breaking my head to understand the below line of code in perl:
next if $pid = fork; # Parent goes to next server.
die "fork failed: $!" unless defined $pid;
Can anyone please explain me in detail as I am a slow learner?
Thanks,
Ali. (2 Replies)
Discussion started by: liyakathali
2 Replies
LEARN ABOUT DEBIAN
ns_execargblk
Ns_Exec(3aolserver) AOLserver Library Procedures Ns_Exec(3aolserver)__________________________________________________________________________________________________________________________________________________NAME
Ns_ExecArgblk, Ns_ExecArgv, Ns_ExecProc, Ns_ExecProcess, Ns_Fork, Ns_GetEnviron, Ns_WaitForProcess, Ns_WaitProcess, ns_fork - External
process execution
SYNOPSIS
#include "ns.h"
int
Ns_ExecArgblk(char *exec, char *dir, int fdin, int fdout,
char *args, Ns_Set *env)
int
Ns_ExecArgv(char *exec, char *dir, int fdin, int fdout,
char **argv, Ns_Set *env)
int
Ns_ExecProc(char *exec, char **argv)
int
Ns_ExecProcess(char *exec, char *dir, int fdin, int fdout,
char *args, Ns_Set *env)
int
Ns_Fork(void)
char
**Ns_GetEnviron(void)
int
Ns_WaitForProcess(int pid, int *statusPtr)
int
Ns_WaitProcess(int pid)
int
ns_fork(void)
_________________________________________________________________DESCRIPTION
These functions handle fork and exec operations. See files: nsd/exec.c, nsd/tclenv.c and nsthread/fork.c.
Ns_ExecArgblk(exec, dir, fdin, fdout, args, env)
Executes a command in a child process. Return process id of child process exec'ing the command or -1 on failure. Provides extended
error checking and error messages.
Ns_ExecArgv(exec, dir, fdin, fdout, argv, env)
Execute a command in a child process using fork(2) and execve(2), returns the process id of child process exec'ing the command or -1
on failure. The child sends an extended error message to the parent.
Ns_ExecProc(exec, argv)
Executes a command in a child process. Returns the process id of the child process exec'ing the command or -1 on failure. Simpli-
fies call to Ns_ExecArgv.
Ns_ExecProcess(exec, dir, fdin, fdout, args, env)
Executes a command in a child process. Returns the process id of the child process exec'ing the command or -1 on failure. Calls
Ns_ExecArgblk with same arguments.
Ns_Fork()
Posix style fork(), using fork1() on Solaris if needed. See fork(2) man page. Calls ns_fork.
Ns_GetEnviron()
Returns pointer to the environment vector.
Ns_WaitForProcess(pid, statusPtr)
Wait for child process. Returns NS_OK on success, or NS_ERROR on failure. *statusPtr is set to the exit code of the child process.
Ns_WaitProcess(pid)
Wait for child process. Calls Ns_WaitForProcess with NULL statusPtr. Returns NS_OK on success, or NS_ERROR on failure.
ns_fork()
Posix style fork(), using fork1() on Solaris if needed.
SEE ALSO nsd(1), info(n)
KEYWORDS AOLserver 4.0 Ns_Exec(3aolserver)