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grantpt(3c) [sunos man page]

grantpt(3C)						   Standard C Library Functions 					       grantpt(3C)

grantpt - grant access to the slave pseudo-terminal device SYNOPSIS
#include <stdlib.h> int grantpt(int fildes); DESCRIPTION
The grantpt() function changes the mode and ownership of the slave pseudo-terminal device associated with its master pseudo-terminal counterpart. fildes is the file descriptor returned from a successful open of the master pseudo-terminal device. A setuid root program (see setuid(2)) is invoked to change the permissions. The user ID of the slave is set to the real UID of the calling process and the group ID is set to a reserved group. The permission mode of the slave pseudo-terminal is set to readable and writable by the owner and writable by the group. RETURN VALUES
Upon successful completion, grantpt() returns 0. Otherwise, it returns -1 and sets errno to indicate the error. ERRORS
The grantpt() function may fail if: EBADF The fildes argument is not a valid open file descriptor. EINVAL The fildes argument is not associated with a master pseudo-terminal device. EACCES The corresponding slave pseudo-terminal device could not be accessed. USAGE
The grantpt() function will fail if it is unable to successfully invoke the setuid root program. It may also fail if the application has installed a signal handler to catch SIGCHLD signals. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |Safe | +-----------------------------+-----------------------------+ SEE ALSO
open(2), setuid(2), ptsname(3C), unlockpt(3C), attributes(5), standards(5) STREAMS Programming Guide SunOS 5.10 29 Dec 1996 grantpt(3C)

Check Out this Related Man Page

PTSNAME(3)						   BSD Library Functions Manual 						PTSNAME(3)

grantpt, ptsname, unlockpt -- pseudo-terminal access functions LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <stdlib.h> int grantpt(int fildes); char * ptsname(int fildes); int unlockpt(int fildes); DESCRIPTION
The grantpt(), ptsname(), and unlockpt() functions allow access to pseudo-terminal devices. These three functions accept a file descriptor that references the master half of a pseudo-terminal pair. This file descriptor is created with posix_openpt(2). The grantpt() function is used to establish ownership and permissions of the slave device counterpart to the master device specified with fildes. The slave device's ownership is set to the real user ID of the calling process, and the permissions are set to user readable- writable and group writable. The group owner of the slave device is also set to the group ``tty''. The ptsname() function returns the full pathname of the slave device counterpart to the master device specified with fildes. This value can be used to subsequently open the appropriate slave after posix_openpt(2) and grantpt() have been called. The unlockpt() function clears the lock held on the pseudo-terminal pair for the master device specified with fildes. RETURN VALUES
The grantpt() and unlockpt() functions return the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error. The ptsname() function returns a pointer to the name of the slave device on success; otherwise a NULL pointer is returned. ERRORS
The grantpt(), ptsname() and unlockpt() functions may fail and set errno to: [EBADF] fildes is not a valid open file descriptor. [EINVAL] fildes is not a master pseudo-terminal device. In addition, the grantpt() function may set errno to: [EACCES] The slave pseudo-terminal device could not be accessed. SEE ALSO
posix_openpt(2), pts(4), tty(4) STANDARDS
The ptsname() function conforms to IEEE Std 1003.1-2008 (``POSIX.1''). This implementation of grantpt() and unlockpt() does not conform to IEEE Std 1003.1-2008 (``POSIX.1''), because it depends on posix_openpt(2) to create the pseudo-terminal device with proper permissions in place. It only validates whether fildes is a valid pseudo-terminal master device. Future revisions of the specification will likely allow this behaviour, as stated by the Austin Group. HISTORY
The grantpt(), ptsname() and unlockpt() functions appeared in FreeBSD 5.0. BSD
August 20, 2008 BSD
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