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getsid(2)
NAME
  getsid - Retrieves the session ID of a process

SYNOPSIS
  #include <unistd.h>

  pid_t getsid(
	  pid_t process_id );

  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:

  getsid():  XPG4-UNIX

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

PARAMETERS
  process_id
      Specifies the process ID that identifies the process for which you want
      to retrieve a session ID.

DESCRIPTION
  Use the getsid function to retrieve the session ID for a process. The
  function returns the session ID assigned to the process identified in the
  process_id parameter.	 If you specify 0 (zero) in the process_id parameter,
  the getsid function returns the session ID of the calling process.

RETURN VALUES
  Upon successful completion, the getsid() function returns the session ID of
  the process identified by the process_id parameter. Otherwise, the function
  returns -1 and sets errno to indicate the error.

ERRORS
  The getsid() function sets errno to the specified values for the following
  conditions:

  [EPERM]
      The process_id parameter identifies a process that is in a different
      session from the calling process.	 A process can use the getsid()
      function to get information only about processes in its own session.

  [ESRCH]
      The system cannot locate the process identified by the process_ID
      parameter.

SEE ALSO
  Functions:  exec(2), fork(2), getpid(2), setpgid(2), setsid(2)

  Standards:  standards(5)

Index for Section 2

Alphabetical listing for G

Top of page