I consider that code dangerous because, when exec fails, the child code will fall into that same loop and start making its own child processes, which will start making their own child processes -- a forkbomb. Always put an exit() after your exec()'s, just in case!
These 2 Users Gave Thanks to Corona688 For This Post:
I have the following functions but when I run SelectQmgr from a Menu Selection it doesn't do anything.
SelectQmgr ()
{
qmgrlist=`ls /var/mqm/qmgrs/ | grep -v @SYSTEM`
qmgrcount=`ls /var/mqm/qmgrs/ | grep -v @SYSTEM | wc -l`
if
then
echo "$qmgrlist QManager will be used "
... (7 Replies)
Hi,
I compiled with no error a C program, than I tryed to execute it and than I get this error:
connessione al server fallita: Address family not supported by protocol family
What does it mean?
Why I get this error only on Mac os x while on Ubuntu the program works?
The code is:... (3 Replies)
how does exec() do it? on successful call of exec() family of functions, they never return...
how to i emulate that.
assume the standard example,
execl("/bin/ls","ls",NULL);
now this would never return.
i m trying to emulate exec()'s never to return feature...
#include<unistd.h>... (4 Replies)
Hi @ all :)
i made a very little shell script witch is working well when i'm launching it directly
like with ./script
but when i'm launching it by cron tab it work at half only.
the part of the script witch are not working are:
#!/bin/sh
apt-get updade
apt-get -s upgrade >>... (5 Replies)
I have the following files in a directory
> ls -1 /tmp/test/dir/
file with spaces 1.ogg
file with spaces 2.oggI am running the following to echo the filenames but alter the file extension on the files to .mp3 instead of .ogg ( I am going to run ffmpeg against the files ultimately, but keeping... (2 Replies)
I have the following bash script lines in a file named test.sh.
#!/bin/bash
#
# Write Date to cron.log
#
echo "Begin SSI Load $(date +%d%b%y_%T)"
#
# Get the latest rates file for processing.
#
d=$(ls -tr /rms/data/ssi | grep -v "processed" | tail -n 1)
filename=$d
export filename... (3 Replies)
I have 7 functions those need to be executed as command line inputs, I tried with below code it’s not executing function. If I run the ./script 2 then fun2 should execute , how to initiate that function I tried case and if else also, how to initiate function from command line
if
then... (8 Replies)
Hi,
I am studying exec family of functions.Its man page says,it replaces the current process image with a new process image. If it replaces the binary,then after returning back,how does it get the previous parameters of the process which called exec?As replacing process image means replacing all... (1 Reply)
I am creating a menu currently that makes use of functions to complete each selected option but running into a bit of trouble calling them into action still fairly new with using functions correctly so any insight is appreciated. here is my code so far
#!/bin/bash
#Last updated on 05/14/14
... (4 Replies)
# Erroneous question, so can be removed. (0 Replies)
Discussion started by: beginnerboy
0 Replies
LEARN ABOUT BSD
fork
FORK(3F)FORK(3F)NAME
fork - create a copy of this process
SYNOPSIS
integer function fork()
DESCRIPTION
Fork creates a copy of the calling process. The only distinction between the 2 processes is that the value returned to one of them
(referred to as the `parent' process) will be the process id of the copy. The copy is usually referred to as the `child' process. The
value returned to the `child' process will be zero.
All logical units open for writing are flushed before the fork to avoid duplication of the contents of I/O buffers in the external file(s).
If the returned value is negative, it indicates an error and will be the negation of the system error code. See perror(3F).
A corresponding exec routine has not been provided because there is no satisfactory way to retain open logical units across the exec. How-
ever, the usual function of fork/exec can be performed using system(3F).
FILES
/usr/lib/libU77.a
SEE ALSO fork(2), wait(3F), kill(3F), system(3F), perror(3F)4.2 Berkeley Distribution May 27, 1986 FORK(3F)