Visit Our UNIX and Linux User Community

Linux and UNIX Man Pages

Test Your Knowledge in Computers #1006
Difficulty: Medium
In calculus and most other branches of mathematics beyond practical geometry, angles are universally measured in degrees.
True or False?
Linux & Unix Commands - Search Man Pages

exit(2) [bsd man page]

EXIT(2) 							System Calls Manual							   EXIT(2)

NAME
_exit - terminate a process SYNOPSIS
_exit(status) int status; DESCRIPTION
_exit terminates a process with the following consequences: All of the descriptors open in the calling process are closed. This may entail delays, for example, waiting for output to drain; a process in this state may not be killed, as it is already dying. If the parent process of the calling process is executing a wait or is interested in the SIGCHLD signal, then it is notified of the calling process's termination and the low-order eight bits of status are made available to it; see wait(2). The parent process ID of all of the calling process's existing child processes are also set to 1. This means that the initialization process (see intro(2)) inherits each of these processes as well. Any stopped children are restarted with a hangup signal (SIGHUP). Most C programs call the library routine exit(3), which performs cleanup actions in the standard I/O library before calling _exit. RETURN VALUE
This call never returns. SEE ALSO
fork(2), sigvec(2), wait(2), exit(3) 4th Berkeley Distribution May 22, 1986 EXIT(2)

Check Out this Related Man Page

EXIT(2) 						      BSD System Calls Manual							   EXIT(2)

NAME
_exit -- terminate the calling process LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <unistd.h> void _exit(int status); DESCRIPTION
The _exit() system call terminates a process with the following consequences: o All of the descriptors open in the calling process are closed. This may entail delays, for example, waiting for output to drain; a process in this state may not be killed, as it is already dying. o If the parent process of the calling process has an outstanding wait(2) call or catches the SIGCHLD signal, it is notified of the calling process's termination and the status is set as defined by wait(2). o The parent process-ID of all of the calling process's existing child processes are set to 1; the initialization process inherits each of these processes (see init(8) and the DEFINITIONS section of intro(2)). o If the termination of the process causes any process group to become orphaned (usually because the parents of all members of the group have now exited; see ``orphaned process group'' in intro(2)), and if any member of the orphaned group is stopped, the SIGHUP signal and the SIGCONT signal are sent to all members of the newly-orphaned process group. o If the process is a controlling process (see intro(2)), the SIGHUP signal is sent to the foreground process group of the controlling ter- minal, and all current access to the controlling terminal is revoked. Most C programs call the library routine exit(3), which flushes buffers, closes streams, unlinks temporary files, etc., before calling _exit(). RETURN VALUES
The _exit() system call can never return. SEE ALSO
fork(2), sigaction(2), wait(2), exit(3), init(8) STANDARDS
The _exit() system call is expected to conform to ISO/IEC 9945-1:1990 (``POSIX.1''). HISTORY
The _exit() function appeared in Version 7 AT&T UNIX. BSD
June 4, 1993 BSD

15 More Discussions You Might Find Interesting

1. Programming

process

how do differentiate a parent process and child process through the process id while it is executing through fork() command. can i get the process id of both processes and can i do any operation on the process by using process id (6 Replies)
Discussion started by: MKSRaja
6 Replies

2. UNIX for Advanced & Expert Users

catch SIGCHLD signal in parent process

I want to catch SIGCHLD signal in parent process. I can't use wait() system call to catch SIGCHLD according to project requirment. Operating system linux 3.1 can any one have a solution for this. Thanking you, ranjan (2 Replies)
Discussion started by: ranjan
2 Replies

3. Programming

signal handler for SIGCHLD

Hi, I have an c++ application which uses the function fork and execvp(). The parent does not wait until the child ends. The parents just creates children and let them do their stuff. You can see the parent program as a batch-manager. I have added a SIGCHLD handler to the program: void... (3 Replies)
Discussion started by: jens
3 Replies

4. Shell Programming and Scripting

how to find the chid process id from given parent process id

how to find the chid process id from given parent process id.... (the chid process doesnot have sub processes inturn) (3 Replies)
Discussion started by: guhas
3 Replies

5. Linux

waiting process

how to know the information of the waiting process how to calculate the time of the process that it has taken to execute i want to make a program that Should be able to keep a log of the processes expired(The log should contain the starting time, expiry time, time slices used, total execution... (2 Replies)
Discussion started by: shukla_chanchal
2 Replies

6. UNIX for Dummies Questions & Answers

About wait

Hi everyone I'm novice at Unix programming and I hope to post this thread in the correct place. I have the following doubts: 1 Suppose we have some processes which are B's children process and another process A which has no relation with B and its children. Can A do wait () for a... (5 Replies)
Discussion started by: Puntino
5 Replies

7. Programming

parent not waiting until child complete executing another program through execl()

Hi, I am calling a program that greps and returns 72536 bytes of data on STDOUT, say about 7000 lines of data on STDOUT. I use pipe from the program am calling the above program. Naturally, I execute the above program (through execl() ) throught the child process and try to read the... (4 Replies)
Discussion started by: vvaidyan
4 Replies

8. UNIX for Advanced & Expert Users

removing hang processes (AIX)

Hi Guys, Just wondering if I have a child process which is basically hanging and I can see that is on sleep or wait mode if I want to remove/terminate this process , the signal has to come from its parent I assume. The reason I'm asking this is because I'm facing a db2 hang situation and we... (3 Replies)
Discussion started by: hariza
3 Replies

9. UNIX for Dummies Questions & Answers

"_exit(-1)" command gives core dump ..

Hi, I am getting fatal error or core dump by using this command "_exit(-1)". I need to terminate the program at a certain condition, but continous calling of this exit function, I am getting core dump. Is there any other command can be used to avoid the core dump ?? (3 Replies)
Discussion started by: ronix007
3 Replies

10. UNIX for Advanced & Expert Users

Forking a new process without parent dependance

hi, I want my program to fork a new process and then I want to kill the parent process. The parent program before dying will issue a SIGTERM to all its childs. Which eventually kills all Children. I cant handle the SIGTERM at the child level.:( What I was thinking of was the Parent... (3 Replies)
Discussion started by: tyler_durden
3 Replies

11. Programming

process status

hello everybody!! i want to post a question! is there any way to get process status using C commands? To be more specific, i want to know whether a process is running or is stop or killed. thanks in advance! (3 Replies)
Discussion started by: nicos
3 Replies

12. Programming

difference between exit() and _exit()

By using exit() and _exit() we can terminate a program. What is the:confused: difference between these two ??? (4 Replies)
Discussion started by: lipun4u
4 Replies

13. Programming

Wait status

hi all! In my C++ program I have a parent process which forks 5 children processes.The processes do a job and then they have to do some sort of sleeping(not terminate) until the parent wakes them up again.There might be 1,2,5 or even 0 processes awake at any moment.The thing is that in the... (9 Replies)
Discussion started by: vlm
9 Replies

14. HP-UX

Long process hpux

Hi, I Have HPUXB.11.23 I need a command, for find the process with more 12 hours executing Thanks Guido (2 Replies)
Discussion started by: Guidocl
2 Replies

15. UNIX for Advanced & Expert Users

How to check a single process instance is always running?

Hi, I want to write one program in C in Unix OS which will check the running status of a process time to time. If the process is stopped somehow by any means, it will ensure that the process is restarted and only one copy of the process image should run in memory at any point of time for the user.... (2 Replies)
Discussion started by: sanzee007
2 Replies

Featured Tech Videos