Hi,
I am a newbie learing Unix , I have started with teh book "the Design of the Unix OS" by Bach.After which I plan to read "UNIX Network Programming" by Richard Stevens.
What is the background that one needs to learn unix. I know C. But I am not sure about my Operating Systems... (4 Replies)
Hi,
I'm new to this forums and to Unix OS...
Is this the right place to put this thread?
I just need to ask how to set the wallpaper that goes through the x-term windows in a Unix system? It's as if the x-term windows is transparent...
I tried modifying the .login file and things got... (5 Replies)
I have a friend at work that asked me a question today and I figured I would seek help here. How does a shell script know whether it is running in the background or not?
Thanks in advance for help (5 Replies)
I have script 3 scripts
1 parent
2 children
child1
child2
In the code below the 2 child processes fire almost Instantaneously in the background, Is that possible to know the status of pass/fail of each process "as it happens" ?
In the present scenario although Child2... (5 Replies)
I have script 3 scripts 1 parent (p1) and 2 children child1 and child2
I have script 3 scripts
1 parent
2 children
child1
child2
In the code below the 2 child processes fire almost Instantaneously in
the background, Is that possible to know the status of pass/fail of each
process... (12 Replies)
NOTE: I am using BASH and Solaris 10 for this.
Currently in the process of building a script that has a main "watcher" daemon that reads a configuration file and starts background processes based on it's global configuration. It is basically an infinite loop of configuration reading. Some of the... (4 Replies)
Hello,
I extracted a list of files in a directory with the command ls . However this is not my computer, so the ls functionality has been revamped so that it gives the filesizes in front like this :
This is the output of ls command : I stored the output in a file filelist
1.1M... (5 Replies)
Hi,
I am using ksh , i have requirement to run 4 functions in background , 4 functions call are available in a case that case is also in function, i need to execute 1st function it should run in background and return to case and next i will call 2nd function it should run in background and... (8 Replies)
we are getting files on daily basis.we need to process these files.
i need a unix shell script where we can count
1-The no of files processed
2-No of data/record processed for each files.
The script should log these details into a database table. If there is any error while file... (3 Replies)
Discussion started by: Atul kumar
3 Replies
LEARN ABOUT SUSE
wait3
WAIT4(2) Linux Programmer's Manual WAIT4(2)NAME
wait3, wait4 - wait for process to change state, BSD style
SYNOPSIS
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/wait.h>
pid_t wait3(int *status, int options,
struct rusage *rusage);
pid_t wait4(pid_t pid, int *status, int options,
struct rusage *rusage);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
wait3(): _BSD_SOURCE
wait4(): _BSD_SOURCE || _XOPEN_SOURCE >= 500
DESCRIPTION
The wait3() and wait4() system calls are similar to waitpid(2), but additionally return resource usage information about the child in the
structure pointed to by rusage.
Other than the use of the rusage argument, the following wait3() call:
wait3(status, options, rusage);
is equivalent to:
waitpid(-1, status, options);
Similarly, the following wait4() call:
wait4(pid, status, options, rusage);
is equivalent to:
waitpid(pid, status, options);
In other words, wait3() waits of any child, while wait4() can be used to select a specific child, or children, on which to wait. See
wait(2) for further details.
If rusage is not NULL, the struct rusage to which it points will be filled with accounting information about the child. See getrusage(2)
for details.
RETURN VALUE
As for waitpid(2).
ERRORS
As for waitpid(2).
CONFORMING TO
4.3BSD.
NOTES
Including <sys/time.h> is not required these days, but increases portability. (Indeed, <sys/resource.h> defines the rusage structure with
fields of type struct timeval defined in <sys/time.h>.)
On Linux, wait3() is a library function implemented on top of the wait4() system call.
SEE ALSO fork(2), getrusage(2), sigaction(2), signal(2), wait(2), signal(7)COLOPHON
This page is part of release 3.25 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 2008-09-28 WAIT4(2)