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HP-UX Reference > Ggrantpt(3C)HP-UX 11i Version 2: December 2007 Update |
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NAMEgrantpt() — grant access to the STREAMS slave pty DESCRIPTIONThe passed parameter, fildes, is a file descriptor that is returned from a successful open of a STREAMS master pty (pseudo-terminal) device. The grantpt() function modifies the ownership and mode of the slave pty device special file associated with its master pty counterpart. A setuid() root program is spawned to change ownership and mode of the pty slave device file in the following way: The group ID is set to a reserved group named "tty". The slave user ID is set to the effective owner 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 VALUEUpon successful completion, the grantpt() function returns a value of 0 (zero). Otherwise, it returns a value of -1. Failure may result under the following conditions:
WARNINGSThe grantpt() function may also fail if the application has installed a signal handler to catch the SIGCHLD (death of a child) signal. EXAMPLESThe following example shows how grantpt() is typically used. int fd_master, fd_slave; char *slave; ... fd_master = open("/dev/ptmx", O_RDWR); grantpt(fd_master); unlockpt(fd_master); slave = ptsname(fd_master); fd_slave = open(slave, O_RDWR); ioctl(fd_slave, I_PUSH, "ptem"); ioctl(fd_slave, I_PUSH, "ldterm"); |
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