getsid(2)getsid(2)NAMEgetsid() - get session ID
The function returns the session ID of the specified process. If pid
is the call applies to the current process. For this to be allowed,
the current process and the referenced process must be in the same ses‐
The actions associated with this system call are subject to compartmen‐
tal restrictions. See compartments(5) for more information about com‐
partmentalization on systems that support that feature.
Compartmental restrictions can be overridden if the process possesses
the privilege (PRIV_COMMALLOWED). Processes owned by the superuser may
not have this privilege. Processes owned by any user may have this
privilege, depending on system configuration.
See privileges(5) for more information about privileged access on sys‐
tems that support fine-grained privileges.
Upon successful completion, returns the session ID of the specified
process. Otherwise, it returns a value of and sets to indicate the
If the function fails, it sets (see errno(2)) to one of the following
[EPERM] The current process and the specified process are
not in the same session.
[ESRCH] No process can be found corresponding to that
specified by pid.
SEE ALSOexec(2), fork(2), getpgid(2), getpid(2), setpgid(2), setsid(2), tcget‐