Content-type: text/html Man page of setsid

setsid

Section: System Calls (2)
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NAME

setsid - Sets the process group ID  

SYNOPSIS

#include <unistd.h>

pid_t setsid( 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:

setsid():  XPG4, XPG4-UNIX

Refer to the standards(5) reference page for more information about industry standards and associated tags.  

DESCRIPTION

The setsid() function creates a new session when the calling process is not a process group leader. The calling process then becomes the session leader of this session, becomes the process leader of the new process group, and has no controlling terminal. The process group ID of the calling process is set equal to its process ID. The calling process becomes the only process in the new process group and the only process in the new session.  

RETURN VALUES

Upon successful completion, the setsid function returns the value of the new process group ID. Otherwise, a value of (pid_t)-1 is returned and errno is set to indicate the error.  

ERRORS

The setsid() function sets errno to the specified values for the following conditions: The calling process is already the process group leader, or the process group ID of another process matches the process ID of the calling process.  

RELATED INFORMATION

Functions: getpid(2), getsid(2), setpgid(2)

Standards: standards(5) delim off


 

Index

NAME
SYNOPSIS
STANDARDS
DESCRIPTION
RETURN VALUES
ERRORS
RELATED INFORMATION

This document was created by man2html, using the manual pages.
Time: 02:40:12 GMT, October 02, 2010