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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 stan- dards as follows: grantpt(): XPG4-UNIX Refer to the standards(5) reference page for more information about in- dustry 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. RELATED INFORMATION Functions: open(2), ptsname(3), setuid(2), unlockpt(3) Standards: standards(5) delim off grantpt(3)