04-23-2018
10 More Discussions You Might Find Interesting
1. UNIX for Advanced & Expert Users
I am attempting to set-up a Makefile to use for a new system on a Sun Unix machine.
I am new to creating Makefiles. I am trying to start simply by compiling a program. I am getting the following error message but an uncertain what 'Error Code 1' is. Is there a web site with Error Codes... (1 Reply)
Discussion started by: CaptainRo
1 Replies
2. Shell Programming and Scripting
Dear Sir/Madam,
I need a bit of your help. The problem is as follows :
I have to create a directory in unix whose name is that of system date in the dd_mon_yyyy format . I am able to extract a date in required format ina variable , but when i'm using this variable in mkdir it is not... (7 Replies)
Discussion started by: aarora_98
7 Replies
3. UNIX for Dummies Questions & Answers
Hi friends,
In my case, there are serveral PCs running Linux in a LAN.
I would like to to mount the directory /A_river of machine-A to the file system of another machine machine-B so that I can access files in that directory.
I do not know how to do this. The situation is complicated by... (2 Replies)
Discussion started by: cy163
2 Replies
4. UNIX for Dummies Questions & Answers
Hell Sir,
This is chanikya
Is there any System call which behaves just like fork but i dont want to return back two times to the calling func.
In the following ex iam creating a child process in the called func but the ex prints two times IN MAIN.
ex :-
calling()
{
fork();
}
... (2 Replies)
Discussion started by: chanikya
2 Replies
5. Filesystems, Disks and Memory
Hello everyone,
I would like some help in the following:
I'm running a Compaq Tru64 UNIX V5.1A (Rev. 1885) and I would like to create a sub-filesystem under a directory of a specific account.
However I 've never done something like that before so any help would be appreciated.
Thanx in... (0 Replies)
Discussion started by: alex7
0 Replies
6. UNIX for Advanced & Expert Users
Hey
I am creating a new system call that needs to know the PID of the calling process. I am new to coding in the kernel, so I don't know if this is possible... Any help would be nice.
Thanks!
Hapatchi (4 Replies)
Discussion started by: Hapatchi
4 Replies
7. UNIX for Dummies Questions & Answers
Hello All,
I am application admin. I need to clear all the temporary files cleared by the applications. I need help/suggestion that is there any way to create a file system such that every Dir created in by any user will have 775 permissions. So, that i can simply clear the temporary file which... (6 Replies)
Discussion started by: firestar
6 Replies
8. Programming
hi guys i'm new to php,,i'm asked to develop a simple online help desk (where the admin can view the problem an forward it to another one to handle it and so on) or get a ready sytem then modify alil on it but i dont know where to start ir to find any suggestion please? (2 Replies)
Discussion started by: kedah160
2 Replies
9. Homework & Coursework Questions
Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
1. The problem statement, all variables and given/known data:
Here is what I am supposed to do, word for word from my assignment page:
1. Create/modify and print a... (2 Replies)
Discussion started by: Jagst3r21
2 Replies
10. Shell Programming and Scripting
We would be migrating UNIX file system to Linux file system.
We do have many directory and sub directories with files.
after migrating unix to linux file system , i want to make sure all the files has been copied ? What would be the best approach to validate directory ,sub-directory and file... (1 Reply)
Discussion started by: balajikalai
1 Replies
fork(2) System Calls Manual fork(2)
Name
fork - create a new process
Syntax
#include <sys/types.h>
#include <unistd.h>
pid = fork()
pid_t pid;
Description
The system call causes creation of a new process. The new process (child process) is an exact copy of the calling process except for the
following:
o The child process has a unique process ID.
o The child process has a different parent process ID (that is, the process ID of the parent process).
o The child process has its own copy of the parent's descriptors. These descriptors reference the same underlying objects, so that, for
instance, file pointers in file objects are shared between the child and the parent, so that a on a descriptor in the child process
can affect a subsequent read or write by the parent. This descriptor copying is also used by the shell to establish standard input
and output for newly created processes as well as to set up pipes.
o The child processes resource utilizations are set to 0. For further information, see
Return Values
Upon successful completion, returns a value of 0 to the child process and returns the process ID of the child process to the parent
process. Otherwise, a value of -1 is returned to the parent process, no child process is created, and the global variable errno is set to
indicate the error.
Diagnostics
The system call fails and no child process are created under the following conditions:
[EAGAIN] The system-imposed limit {PROC_MAX} on the total number of processes under execution would be exceeded.
[EAGAIN] The system-imposed limit {CHILD_MAX} on the total number of processes under execution by a single user would be exceeded.
[ENOMEM] There is insufficient swap space for the new process.
See Also
execve(2), wait(2)
fork(2)