GETSID(2) BSD Programmer's Manual GETSID(2)
getsid - get process session
#include <unistd.h> pid_t getsid(pid_t pid);
The session ID of the process identified by pid is returned by getsid(). If pid is zero, getsid() returns the session ID of the current process.
Upon successful completion, the function getsid() returns the session ID of the specified process; otherwise, it returns a value of -1 and sets errno to indicate an error.
getsid() will succeed unless: [EPERM] The current process and the process pid are not in the same session. [ESRCH] There is no process with a process ID equal to pid.
getpgid(2), getpgrp(2), setpgid(2), setsid(2), termios(4)
The getsid() function call is derived from its usage in AT&T System V UNIX, and is mandated by X/Open Portability Guide Issue 4 ("XPG4"). MirOS BSD #10-current August 19, 1997 1
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