getpid(2) System Calls Manual getpid(2)NAME
getpid, getpgrp, getppid - Gets the process ID, process group ID, parent process ID
SYNOPSIS
#include <unistd.h>
pid_t getpid( void );
pid_t getpgrp( void );
pid_t getppid( void );
Application developers may want to specify an #include statement for <sys/types.h> before the one for <unistd.h> if programs are being
developed for multiple platforms. The additional #include statement is not required on Tru64 UNIX systems or by ISO or X/Open standards,
but may be required on other vendors' systems that conform to these standards.
STANDARDS
Interfaces documented on this reference page conform to industry standards as follows:
getpid(), getpgrp(), getppid(): POSIX.1, XPG4, XPG4-UNIX
Refer to the standards(5) reference page for more information about industry standards and associated tags.
DESCRIPTION
The getpid() function returns the process ID of the calling process.
The getpgrp() function returns the process group ID of the calling process.
The getppid() function returns the parent process ID of the calling process. When a process is created, its parent process ID is the
process ID of its parent process. If a parent process exits, the parent process IDs of its child processes are changed to the process ID
of the init program.
RELATED INFORMATION
System calls: fork(2), kill(2), setpgid(2), setsid(2), wait(2)
Standards: standards(5) delim off
getpid(2)
Check Out this Related Man Page
getpid(2) System Calls getpid(2)NAME
getpid, getpgrp, getppid, getpgid - get process, process group, and parent process IDs
SYNOPSIS
#include <unistd.h>
pid_t getpid(void);
pid_t getpgrp(void);
pid_t getppid(void);
pid_t getpgid(pid_t pid);
DESCRIPTION
The getpid() function returns the process ID of the calling process.
The getpgrp() function returns the process group ID of the calling process.
The getppid() function returns the parent process ID of the calling process.
The getpgid() function returns the process group ID of the process whose process ID is equal to pid, or the process group ID of the calling
process, if pid is equal to 0.
RETURN VALUES
The getpid(), getpgrp(), and getppid() functions are always successful and no return value is reserved to indicate an error.
Upon successful completion, getpgid() returns the process group ID. Otherwise, getpgid() returns (pid_t)-1 and sets errno to indicate the
error.
ERRORS
The getpgid() function will fail if:
EPERM The process whose process ID is equal to pid is not in the same session as the calling process, and the implementation does not
allow access to the process group ID of that process from the calling process.
ESRCH There is no process with a process ID equal to pid.
The getpgid() function may fail if:
EINVAL The value of the pid argument is invalid.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Committed |
+-----------------------------+-----------------------------+
|MT-Level |Async-Signal-Safe |
+-----------------------------+-----------------------------+
|Standard |See standards(5). |
+-----------------------------+-----------------------------+
SEE ALSO Intro(2), exec(2), fork(2), getsid(2), setpgid(2), setpgrp(2), setsid(2), signal(3C), attributes(5), standards(5)SunOS 5.11 27 Jan 2009 getpid(2)
Hi im a student,
1st time using unix, currently were writing programs using fork() and identifying differences between the parent child processes. Im finding getpid(), getppid(), retVal confusing and we are moving on to grps now any
sites or information you can supply me to make... (1 Reply)
I'm a complete newbie to UNIX so bear with me please...
I would like to get a description or process flow of a typcial UNIX loging process....for example, from the moment someone inputs their ID and password to final access. What are the files and order in which they are accessed? How does the... (2 Replies)
I have been asked to put together some coding standards for the project I am assigned to. I have found documented standards for C/C++, Java but was wondering if there is a good place for UNIX scripting (Korn/Bourne) standards?
Does anyone know of a good place to find information on scripting... (3 Replies)
I'am new in C programming in UNIX.
the code is as following:
---------------------------------
#include<stdio.h>
#include<unistd.h>
int main()
{
printf("pid=%d\n",getpid());
return 0;
}
----------------------------------
when I compile it(gcc) it output errors:
Undefined ... (4 Replies)
Hi,
i need to find the process name using the process id in C. This has to be done in HP, AIX, Solaris & Linux??
How can this be done? Is there any common solution to all platforms?
On linux i have heard that /proc/<pid>/cmdline can be used. Is there a structure available to read this?
... (3 Replies)
can anyone tell me the program about how to implement a routine similar to getpid() in C program without using the function getpid(). ie. the program has to find out the pid of the process without using the getpid command. Please do help me in this regards at the earliest. (3 Replies)
On HP-UX, in application, if the process id has been get with the getpid() and sotred in database, then other monitor process want to check it if the process is existed, are there any system function can do it? I do not want to use the shell script, because it should use popen function to excuted... (5 Replies)
Suppose we have the following process tree:
init-> ProcessA->processB->processC
then I kill processB
Who is the parent of the processC?
init or the processA (6 Replies)
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)
I need to kill all the processes of user "release" on system "PROterm" or the parent process for the user
I did this
ps -ef | grep PROterm | grep release
i got
release 2900014 2961494 0 12:19:44 pts/3 0:00 PROterm
release 3264694 2900014 0 12:19:44 - 0:00 PROterm
if i... (7 Replies)
Hi,
can somebody please help me regarding this?
How can i print parent's PID from child's and vice versa.
I have tried with getpid() & ngetppid() function but it is not giving me the correct data. The logic i used is:
if (pid == 0)
{
getpid() : Chil'd PID
getppid():... (1 Reply)
Hi All
I am not sure this is the right place to ask this question.
I am from India ( Mumbai ) .I am in IT industry ( as Application developer / System support ) for nearly 4 years i dont have any direct security related work experience but i did work on cryptography & Access control in 2... (4 Replies)
I have been having some trouble trying to get some code working, so I was wondering...what system calls are required to execute a different program from an already running process? (1 Reply)