Index for Section 2

Alphabetical listing for S

Bottom of page

setsid(2)
NAME
  setsid - Set 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 XSH standards, but may be on other
  vendors' systems that conform to these standards.

STANDARDS
  Interfaces documented on this reference page conform to industry standards
  as follows:

  setsid(): XSH4.0, XSH4.2, XSH5.0

  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.

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

  Standards: standards(5)

Index for Section 2

Alphabetical listing for S

Top of page