|
|
Sponsored Content
Top Forums
Programming
Question about execl, replacing process's contents
Post 302987907 by SirSalt on Sunday 18th of December 2016 10:20:28 PM
12-18-2016
Alright, thank you for clarifying that 
---------- Post updated 12-18-16 at 09:20 PM ---------- Previous update was 12-17-16 at 10:28 PM ----------
As I meditated on what you said, I thought of something. In your #3 explanation, would the tty be process "A"? Or would the tty in your example be process "B"? I guess I have a slight and subtle confusion about using "fork" and "forked" in the verb context. When you said "You actually forked a child ("B")", was forking the child a result of calling fork() in process "A", or calling fork() in process "B"? I hope you can see what I'm getting at here. :P
---------- Post updated 12-18-16 at 09:20 PM ---------- Previous update was 12-17-16 at 10:28 PM ----------
As I meditated on what you said, I thought of something. In your #3 explanation, would the tty be process "A"? Or would the tty in your example be process "B"? I guess I have a slight and subtle confusion about using "fork" and "forked" in the verb context. When you said "You actually forked a child ("B")", was forking the child a result of calling fork() in process "A", or calling fork() in process "B"? I hope you can see what I'm getting at here. :P
|
|
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
I'm writing a shell script and I need to replace the contents of a configuration file based on what is passed to the script...can I replace expressions in a file from a bash shell script? (2 Replies)
Discussion started by: HumanBeanDip
2 Replies
2. Shell Programming and Scripting
Hello,
Do you have any idea why the below sed command is also replacing the value of "PARAMETER2" instead of just "PARAMETER" in file1 ?
% parameter=PARAMETER
% new_value=2
% cat file1
PARAMETER=1
PARAMETER2=1
% cat file1 | sed s/*$/${new_value}/1
PARAMETER=2
PARAMETER2=2
Thanks. (3 Replies)
Discussion started by: majormark
3 Replies
3. Shell Programming and Scripting
Hi All,
I have a query on Perl. I have a text file which has 3 lines, i want to only replace the first line with my replaced text and keep the rest of the text. FOr eg
Before change -->
echo:a:pending
echo:b:pending
echo:c:pending
After change --->
echo:a:done
echo:b:pending... (1 Reply)
Discussion started by: tosatesh
1 Replies
4. Shell Programming and Scripting
I'm trying to change the ramfs size in kernel .config automatically.
I have a ramfs_size file generated with du -s
cat ramfs_size
64512
I want to replace the linux .config's ramdisk size with the above value
CONFIG_BLK_DEV_RAM_SIZE=73728
Right now I'm doing something dumb like: ... (3 Replies)
Discussion started by: amoeba
3 Replies
5. Shell Programming and Scripting
Hi,
I have a set of files stored in a single directory that I use to set parameters for a physics code, and I would like to streamline the process of updating them all when I change a parameter. For instance, if the files are called A2000p300ini, A2000p300sub, A2000p300run, and the text in each... (3 Replies)
Discussion started by: BlueChris
3 Replies
6. Shell Programming and Scripting
We have 2 file XML files - FILE1.XML and FILE2.xml - we need copy the contents of FILE1.XML and replace in FILE2.xml pattern "<assignedAttributeList></assignedAttributeList>"
FILE1.XML
1. <itemList>
2. <item type="Manufactured">
3. <resourceCode>431048</resourceCode>
4. ... (0 Replies)
Discussion started by: balrajg
0 Replies
7. Shell Programming and Scripting
I have the following code:
print @testarray;
which returns:
8
8
8
9
How do I return the array like this:
The output is: 8, 8, 8, 9 (5 Replies)
Discussion started by: streetfighter2
5 Replies
8. UNIX for Dummies Questions & Answers
I need to replace all filesnames in a folder as well as its content from AK6 to AK11. Eg Folder has files AK6-Create.xml, AK6-system.py etc.. the files names as well as contents should be changes to AK9-Create.xml, AK9-system.py etc
All files are xml and python scripts.
---------- Post... (0 Replies)
Discussion started by: Candid247
0 Replies
9. UNIX for Dummies Questions & Answers
Hi,
I'm very new to Linux but have been muddling my way through quite happily until recently.
I'm trying to write a program in C++ which starts a new process using the execl command. I am trying to run the tftp process as follows:
char ip_addr = "...";
if (execl("usr/bin/tftp", "tftp",... (2 Replies)
Discussion started by: JoC
2 Replies
10. UNIX for Dummies Questions & Answers
Guys, I have the following code
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/wait.h>
#include <unistd.h>
void read2();
main(int argc, char** argv)
{
int pid,status;
pid=fork();
if ( pid == 0 )
{
read2(argv,... (4 Replies)
Discussion started by: pfpietro
4 Replies
LEARN ABOUT DEBIAN
setsid
SETSID(2) Linux Programmer's Manual SETSID(2) NAME
setsid - creates a session and sets the process group ID SYNOPSIS
#include <unistd.h> pid_t setsid(void); DESCRIPTION
setsid() creates a new session if the calling process is not a process group leader. The calling process is the leader of the new session, the process group leader of the new process group, and has no controlling tty. The process group ID and session ID of the calling process are set to the PID of the calling process. The calling process will be the only process in this new process group and in this new session. RETURN VALUE
On success, the (new) session ID of the calling process is returned. On error, (pid_t) -1 is returned, and errno is set to indicate the error. ERRORS
EPERM The process group ID of any process equals the PID of the calling process. Thus, in particular, setsid() fails if the calling process is already a process group leader. CONFORMING TO
SVr4, POSIX.1-2001. NOTES
A child created via fork(2) inherits its parent's session ID. The session ID is preserved across an execve(2). A process group leader is a process with process group ID equal to its PID. In order to be sure that setsid() will succeed, fork(2) and _exit(2), and have the child do setsid(). SEE ALSO
getsid(2), setpgid(2), setpgrp(2), tcgetsid(3), credentials(7) COLOPHON
This page is part of release 3.44 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. Linux 2008-12-03 SETSID(2)