Content-type: text/html Man page of grantpt

grantpt

Section: C Library Functions (3)
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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 counterpart.

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 indicate 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 descriptor. 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


 

Index

NAME
LIBRARY
SYNOPSIS
STANDARDS
PARAMETERS
DESCRIPTION
RETURN VALUES
ERRORS
RELATED INFORMATION

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Time: 02:42:41 GMT, October 02, 2010