ptm(4d) 맨 페이지 - 윈디하나의 솔라나라
|
svcadm(1M)
을 검색하려면 섹션에서
1M
을 선택하고, 맨 페이지 이름에
svcadm
을 입력하고 검색을 누른다.Device Drivers & /dev files ptm(4D) NAME ptm - STREAMS pseudo-tty master driver DESCRIPTION The pseudo-tty subsystem simulates a terminal connection, where the master side represents the terminal and the slave represents the user process's special device end point. The master device is set up as a cloned device where its major device number is the major for the clone device and its minor device number is the major for the ptm driver. There are no nodes in the file system for master devices. The master pseudo driver is opened using the open(2) system call with /dev/ptmx as the device parameter. The clone open finds the next available minor device for the ptm major device. A master device is available only if it and its corresponding slave device are not already open. When the master device is opened, the cor‐ responding slave device is automatically locked out. Only one open is allowed on a master device. Multiple opens are allowed on the slave device. After both the master and slave have been opened, the user has two file descriptors which are the end points of a full duplex connec‐ tion composed of two streams which are automatically connected at the master and slave drivers. The user may then push modules onto either side of the stream pair. The master and slave drivers pass all messages to their adjacent queues. Only the M_FLUSH needs some processing. Because the read queue of one side is connected to the write queue of the other, the FLUSHR flag is changed to the FLUSHW flag and vice versa. When the master device is closed an M_HANGUP message is sent to the slave device which will render the device unusable. The process on the slave side gets the errno EIO when attempting to write on that stream but it will be able to read any data remaining on the stream head read queue. When all the data has been read, read() returns 0 indicating that the stream can no longer be used. On the last close of the slave device, a 0-length mes‐ sage is sent to the master device. When the application on the master side issues a read() or getmsg() and 0 is returned, the user of the master device decides whether to issue a close() that dismantles the pseudo-terminal subsystem. If the master device is not closed, the pseudo-tty subsystem will be available to another user to open the slave device. If O_NONBLOCK or O_NDELAY is set, read on the master side returns −1 with errno set to EAGAIN if no data is available, and write returns −1 with errno set to EAGAIN if there is internal flow control. IOCTLS The master driver supports the ISPTM and UNLKPT ioctls that are used by the functions grantpt(3C), unlockpt(3C) and ptsname(3C). The ioctl ISPTM determines whether the file descriptor is that of an open master device. On success, it returns the 0. The ioctl UNLKPT unlocks the mas‐ ter and slave devices. It returns 0 on success. On failure, the errno is set to EINVAL indicating that the master device is not open. FILES /dev/ptmx master clone device /dev/pts/N slave devices (N = 1 -> number of ptys available) SEE ALSO ptsname(3C), unlockpt(3C), grantpt(3C), pts(4D), pckt(4M) STREAMS Programming Guide Oracle Solaris 11.4 Tunable Parameters Reference Manual Oracle Solaris 11.4 12 June 2017 ptm(4D)맨 페이지 내용의 저작권은 맨 페이지 작성자에게 있습니다.
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