when parent process close, how to close the child?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

How make parent to wait from child process?

Hi all, I am starting mgen5 for sometime depends on input from a file, in a child process. now I want to make parent to wait in this child process till mgen5 finishes, or timeout happens. could anyone please tell me how to make parent to wait in child process in shell script? thanks...

2. UNIX for Advanced & Expert Users

Close file descriptor without terminating process

Can any help me in finding the way to close opened file descriptor in Solaris ,without killing process. As accidently a file was removed which was opened by a process. Much thanks in advance :)

3. Shell Programming and Scripting

forking a child process and kill its parent to show that child process has init() as its parent

Hi everyone i am very new to linux , working on bash shell. I am trying to solve the given problem 1. Create a process and then create children using fork 2. Check the Status of the application for successful running. 3. Kill all the process(threads) except parent and first child...

4. Emergency UNIX and Linux Support

signal between parent process and child process

Hello, everyone. Here's a program: pid_t pid = fork(); if (0 == pid) // child process { execvp ...; } I send a signal (such as SIGINT) to the parent process, the child process receive the signal as well as the parent process. However I don't want to child process to receive the...

5. Shell Programming and Scripting

Usage of NOHUP - How to keep the child process running even if I close the Server connection

Hi. ! When I use the 'NOHUP' along with the '&', the process will be running in the background. Even when I attempt to close (Meaning 'EXIT') the session (say PUTTY in this case), it wont exit unless the process is completed. But, say when I forcefully terminate the session (SHUT DOWN the...

6. Shell Programming and Scripting

[KSH/Bash] Starting a parent process from a child process?

Hey all, I need to launch a script from within 2 other scripts that can run independently of the two parent scripts... Im having a hard time doing this, if anyone knows how please let me know. More detail. ScriptA (bash), ScriptB (ksh), ScriptC (bash) ScriptA, launches ScriptB ScirptB,...

7. Solaris

file open/read/write/close/access by process

Hi want to know what file (descriptor+filename+socket) is being accessed by particular process on solaris. Purpose : while running perf. test, needs to find where is the bottleneck. We are providing concurrnet load for around 1 hr and needs to capture data related to file usage pattern...

8. Shell Programming and Scripting

How to make the parent process to wait for the child process

Hi All, I have two ksh script. 1st script calls the 2nd script and the second script calls an 'C' program. I want 1st script to wait until the 'C' program completes. I cant able to get the process id for the 'C' program (child process) to make the 1st script to wait for the second...

9. Programming

parent and child process question?

Hi everybody, I'm trying to understand how a parent and child processes interact. This function( below) basically measures the fork time from the perspective of the parent only. what i would like to know is how to measure the time from the perspective of parent and child (ie: inserting...

10. UNIX for Dummies Questions & Answers

Should a UNIX daemon process close open fds?

I have a UNIX daemon process that's been started by a parent process, an application server. The behavior of this daemon process is to inherit and use the app server's file descriptors (ports/sockets). When I shutdown the app server, the daemon continues to run, because there may be other...

LEARN ABOUT MINIX

close

CLOSE(2)							System Calls Manual							  CLOSE(2)

NAME

       close - delete a descriptor

SYNOPSIS

       #include <unistd.h>

       int close(int d)

DESCRIPTION

       The  close  call deletes a descriptor from the per-process object reference table.  If this is the last reference to the underlying object,
       then it will be deactivated.  For example, on the last close of a file the current seek pointer associated with the file is  lost;  on  the
       last close of a TCP/IP descriptor associated naming information and queued data are discarded; on the last close of a file holding an advi-
       sory lock the lock is released (see further fcntl(2)).

       A close of all of a process's descriptors is automatic on exit, but since there is a limit on the number of active descriptors per process,
       close is necessary for programs that deal with many descriptors.

       When  a	process forks (see fork(2)), all descriptors for the new child process reference the same objects as they did in the parent before
       the fork.  If a new process is then to be run using execve(2), the process would normally inherit these descriptors.  Most of the  descrip-
       tors  can  be  rearranged with dup2(2) or deleted with close before the execve is attempted, but if some of these descriptors will still be
       needed if the execve fails, it is necessary to arrange for them to be closed if the execve succeeds.  For this reason, the call	``fcntl(d,
       F_SETFD, flags)'' is provided, that can be used to mark a descriptor "close on exec" by setting the FD_CLOEXEC flag:

	      fcntl(d, F_SETFD, fcntl(d, F_GETFD) | FD_CLOEXEC);

RETURN VALUE

       Upon successful completion, a value of 0 is returned.  Otherwise, a value of -1 is returned and the global integer variable errno is set to
       indicate the error.

ERRORS

       Close will fail if:

       [EBADF]	      D is not an active descriptor.

SEE ALSO

       open(2), pipe(2), execve(2), fcntl(2).

4th Berkeley Distribution					   May 22, 1986 							  CLOSE(2)

Programming