grantpt man page on OSF1

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grantpt(3)							    grantpt(3)

NAME
       grantpt - Permit access to the slave pseudoterminal device

SYNOPSIS
       #include <stdlib.h>

       int grantpt(
	       int fildes );

LIBRARY
       Standard C Library (libc)

STANDARDS
       Interfaces  documented on this reference page conform to industry stan‐
       dards 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 indicate
       the error.

ERRORS
       The grantpt() function sets errno to the specified values for the  fol‐
       lowing 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.

SEE ALSO
       Functions: open(2), ptsname(3), setuid(2), unlockpt(3)

       Standards: standards(5)

								    grantpt(3)
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