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Full Discussion: UNIX programming problems
Top Forums UNIX for Dummies Questions & Answers UNIX programming problems Post 1295 by Adam on Thursday 22nd of February 2001 12:25:45 PM
Old 02-22-2001
Question

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 this alittle clearer would be greatly appreciated.
 

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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)
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