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openpty (3)

>> openpty (3) ( FreeBSD man: Библиотечные вызовы )

openpty (3) ( Русские man: Библиотечные вызовы )

openpty (3) ( Linux man: Библиотечные вызовы )

BSD mandoc

NAME

openpty

 
forkpty

 - auxiliary functions to obtain a pseudo-terminal

LIBRARY

Lb libutil

SYNOPSIS

   #include <sys/types.h>
   #include <sys/ioctl.h>
   #include <termios.h>
   #include <libutil.h>
int openpty (int *amaster int *aslave char *name struct termios *termp struct winsize *winp);
int forkpty (int *amaster char *name struct termios *termp struct winsize *winp);

DESCRIPTION

The function openpty ();
attempts to obtain the next available pseudo-terminal from the system (see pty(4)). If it successfully finds one, it subsequently changes the ownership of the slave device to the real UID of the current process, the group membership to the group ``tty'' (if such a group exists in the system), the access permissions for reading and writing by the owner, and for writing by the group, and invalidates any current use of the line by calling revoke(2).

If the argument Fa name is not NULL openpty ();
copies the pathname of the slave pty to this area. The caller is responsible for allocating the required space in this array.

If the arguments Fa termp or Fa winp are not NULL openpty ();
initializes the termios and window size settings from the structures these arguments point to, respectively.

Upon return, the open file descriptors for the master and slave side of the pty are returned in the locations pointed to by Fa amaster and Fa aslave , respectively.

The forkpty ();
function first calls openpty ();
to obtain the next available pseudo-terminal from the system. Upon success, it forks off a new process. In the child process, it closes the descriptor for the master side of the pty, and calls login_tty3 for the slave pty. In the parent process, it closes the descriptor for the slave side of the pty. The arguments Fa amaster , Fa name , Fa termp , and Fa winp have the same meaning as described for openpty (.);

RETURN VALUES

The openpty ();
function returns 0 on success, or -1 on failure.

The forkpty ();
function returns -1 on failure, 0 in the slave process, and the process ID of the slave process in the parent process.

ERRORS

The openpty ();
function may fail and set the global variable errno for any of the errors specified for the grantpt(3), posix_openpt3, ptsname(3), and unlockpt(3) functions and the revoke(2) system call.

In addition to this, forkpty ();
may set it to any value as described for fork(2).

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Created 1996-2024 by Maxim Chirkov
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