grantpt(3) [osf1 man page]
grantpt(3) Library Functions Manual grantpt(3) NAME
grantpt - Permits access to the slave pseudoterminal device LIBRARY
Standard C Library (libc.so, libc.a) SYNOPSIS
#include <stdlib.h> int grantpt( int fildes); STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: grantpt(): XPG4-UNIX Refer to the standards(5) reference page for more information about industry standards and associated tags. PARAMETERS
Specifies a file descriptor that is returned from a successful open of a master pseudoterminal device. DESCRIPTION
The grantpt() function modifies the ownership and mode of the slave pseudoterminal device associated with its master pseudoterminal coun- terpart. The modifications of mode and ownership are performed as follows: The group ID is set to a reserved group. The slave user ID is set to the real UID of the calling process. The permissions of the slave device are set so that the owner is allowed read and write access and the group is allowed write access. RETURN VALUES
Upon successful completion, the grantpt() function returns a value of 0 (zero). Otherwise, it returns a value of -1 and sets errno to indi- cate the error. ERRORS
The grantpt() function sets errno to the specified values for the following conditions: The corresponding slave device cannot be accessed. The file descriptor specified by the fildes parameter is not a valid open file descrip- tor. The file descriptor specified by the fildes parameter is not associated with a master device. The grantpt() function may also fail if the application has installed a signal handler to catch SIGCHLD (death of a child) signals. Applications calling grantpt() may get a SIGCHLD signal from processes that they did not explicitly create. RELATED INFORMATION
Functions: open(2), ptsname(3), setuid(2), unlockpt(3) Standards: standards(5) delim off grantpt(3)
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grantpt(3C) Standard C Library Functions grantpt(3C) NAME
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)