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Top Forums UNIX for Beginners Questions & Answers Running process in the background Post 303015677 by uniran on Tuesday 10th of April 2018 06:28:01 AM
Old 04-10-2018
Running process in the background

Hi,

I have this simple c program that creates duplicate process with fork():

Code:
#include <sys/types.h>
main()
{
if (fork() == 0)
while(1);
else
while(1);
}

I tried running it in the background

Code:
gcc -o test first.c
test &

And I got this list of running process:

Code:
ps -l
F S   UID    PID   PPID  C PRI  NI ADDR SZ WCHAN  TTY          TIME CMD
0 S  1000  46202  46194  0  80   0 -  5782 wait   pts/0    00:00:01 bash
0 T  1000  47701  46202  0  80   0 -  1998 signal pts/0    00:00:00 awk
0 T  1000  47702  46202  0  80   0 -  1998 signal pts/0    00:00:00 awk
0 R  1000  54295  46202  0  80   0 -  8370 -      pts/0    00:00:00 ps
[3]   Exit 1                  test

Why can`t I see the PID of the two process (father and son) created with the fork() ?
 

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PTS_QUIT(1)						       AFS Command Reference						       PTS_QUIT(1)

NAME
pts_quit - Exit from pts interactive mode SYNOPSIS
pts quit [-cell] <cell name> [-noauth] [-localauth] [-force] pts q [-c] <cell name> [-n] [-l] [-f] DESCRIPTION
The pts quit command exits from pts interactive mode. The command can be run from the command line or interactively, but on the command line it does nothing and is therefore of questionable utility. CAUTIONS
Prior to OpenAFS 1.4.5 and OpenAFS 1.5.23, the pts quit command was only available on Unix or Linux and when OpenAFS was compiled with the supergroups option (disabled by default). As of OpenAFS 1.4.5 and 1.5.23, it is always available. OPTIONS
Although they have no effect, pts quit takes the following standard pts options: -cell <cell name> Names the cell in which to run the command. For more details, see pts(1). -force Enables the command to continue executing as far as possible when errors or other problems occur, rather than halting execution at the first error. -help Prints the online help for this command. All other valid options are ignored. -localauth Constructs a server ticket using a key from the local /etc/openafs/server/KeyFile file. Do not combine this flag with the -cell or -noauth options. For more details, see pts(1). -noauth Assigns the unprivileged identity anonymous to the issuer. For more details, see pts(1). OUTPUT
This command produces no output. EXAMPLES
Here is an example of a pts interactive session: % pts interactive pts> quit % SEE ALSO
pts(1), pts_interactive(1) COPYRIGHT
Copyright 2007 Jason Edgecombe <jason@rampaginggeek.com> This documentation is covered by the BSD License as written in the doc/LICENSE file. This man page was written by Jason Edgecombe for OpenAFS. OpenAFS 2014-04-08 PTS_QUIT(1)
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