получить идентификатор группы процессов переднего плана (get the foreground process group ID)
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)
tcgetpgrp — get the foreground process group ID
Синопсис (Synopsis)
#include <unistd.h>
pid_t tcgetpgrp(int fildes);
Описание (Description)
The tcgetpgrp() function shall return the value of the process
group ID of the foreground process group associated with the
terminal.
If there is no foreground process group, tcgetpgrp() shall return
a value greater than 1 that does not match the process group ID
of any existing process group.
The tcgetpgrp() function is allowed from a process that is a
member of a background process group; however, the information
may be subsequently changed by a process that is a member of a
foreground process group.
Возвращаемое значение (Return value)
Upon successful completion, tcgetpgrp() shall return the value of
the process group ID of the foreground process associated with
the terminal. Otherwise, -1 shall be returned and errno set to
indicate the error.
Ошибки (Error)
The tcgetpgrp() function shall fail if:
EBADF The fildes argument is not a valid file descriptor.
ENOTTY The calling process does not have a controlling terminal,
or the file is not the controlling terminal.
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)
setsid(3p), setpgid(3p), tcsetpgrp(3p)
The Base Definitions volume of POSIX.1‐2017, sys_types.h(0p),
unistd.h(0p)
