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getsid(2) [osf1 man page]

getsid(2)							System Calls Manual							 getsid(2)

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
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: 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. 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) getsid(2)

Check Out this Related Man Page

GETSID(3P)                                                   POSIX Programmer's Manual                                                  GETSID(3P)

This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the correspond- ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux. NAME
getsid - get the process group ID of a session leader SYNOPSIS
#include <unistd.h> pid_t getsid(pid_t pid); DESCRIPTION
The getsid() function shall obtain the process group ID of the process that is the session leader of the process specified by pid. If pid is (pid_t)0, it specifies the calling process. RETURN VALUE
Upon successful completion, getsid() shall return the process group ID of the session leader of the specified process. Otherwise, it shall return (pid_t)-1 and set errno to indicate the error. ERRORS
The getsid() function shall fail if: EPERM The process specified by pid is not in the same session as the calling process, and the implementation does not allow access to the process group ID of the session leader of that process from the calling process. ESRCH There is no process with a process ID equal to pid. The following sections are informative. EXAMPLES
exec(), fork(), getpid(), getpgid(), setpgid(), setsid(), the Base Definitions volume of IEEE Std 1003.1-2001, <unistd.h> COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol- ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at . IEEE
/The Open Group 2003 GETSID(3P)
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