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setsid(2)
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:

  [EPERM]   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)

Index for Section 2

Alphabetical listing for S

Top of page