NAME

ptsname — get the pathname of the slave pseudo-terminal device

LIBRARY

Standard C Library (libc, -lc)

SYNOPSIS

#include <stdlib.h>

char *
ptsname(int masterfd);

DESCRIPTION

The ptsname() function returns the pathname of the slave pseudo-terminal device that corresponds to the master pseudo-terminal device associated with masterfd. The ptsname() function is not reentrant or thread-safe.

RETURN VALUES

If successful, ptsname() returns a pointer to a nul-terminated string containing the pathname of the slave pseudo-terminal device. If an error occurs ptsname() will return NULL and errno is set to indicate the error.

ERRORS

The ptsname() function will fail if:

[EACCESS]

the corresponding pseudo-terminal device could not be accessed.

[EBADF]

masterfd is not a valid descriptor.

[EINVAL]

masterfd is not associated with a master pseudo-terminal device.

NOTES

The error returns of ptsname() are a NetBSD extension. The ptsname() function is equivalent to:

	struct ptmget pm; 
	return ioctl(masterfd, TIOCPTSNAME, &pm) == -1 ? NULL : pm.ps;

SEE ALSO

ioctl(2), grantpt(3), posix_openpt(3), unlockpt(3)

STANDARDS

The ptsname() function conforms to IEEE Std 1003.1-2001 (“POSIX.1”). Its first release was in X/Open Portability Guide Issue 4, Version 2 (“XPG4.2”).