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HP-UX 11i Version 3: February 2007

Technical documentation

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setpgrp — set process group ID


#include <unistd.h>

pid_t setpgrp(void);


If the calling process is not already a session leader, setpgrp() sets the process group ID of the calling process to the process ID of the calling process. If setpgrp() creates a new session, then the new session has no controlling terminal.

The setpgrp() function has no effect when the calling process is a session leader.

Security Restrictions

Some or all of the actions associated with this system call may require privileges. See privileges(5) for more information.


Upon successful completion, setpgrp() returns the new process group ID.


If setpgrp() fails, no changes occur and errno (see errno(2)) is set to one of the following values:


The calling process is already a process group leader or the process group ID of a process other than the calling process matches the process ID of the calling process.


The calling process does not have sufficient privileges.


setpgrp(): SVID2, SVID3, XPG2, XPG3, XPG4, XPG4.2

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