получить идентификатор группы процессов лидера сеанса (get the process group ID of a session leader)
Пролог (Prolog)
This manual page is part of the POSIX Programmer's Manual. The
Linux implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
Имя (Name)
getsid — get the process group ID of a session leader
Синопсис (Synopsis)
#include <unistd.h>
pid_t getsid(pid_t pid);
Описание (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.
Возвращаемое значение (Return value)
Upon successful completion, getsid() shall return the process
group ID of the session leader of the specified process.
Otherwise, it shall return -1 and set errno to indicate the
error.
Ошибки (Error)
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.
Примеры (Examples)
None.
Использование в приложениях (Application usage)
None.
Обоснование (Rationale)
None.
Будущие направления (Future directions)
None.
Смотри также (See also)
exec(1p), fork(3p), getpid(3p), getpgid(3p), setpgid(3p),
setsid(3p)
The Base Definitions volume of POSIX.1‐2017, unistd.h(0p)
