| PTSNAME(3) | Library Functions Manual | PTSNAME(3) |
ptsname, ptsname_r —
#include <stdlib.h>
char *
ptsname(int
masterfd);
int
ptsname_r(int
masterfd, char
*buf, size_t
buflen);
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.
The ptsname_r() function places the
pathname of the slave pseudo-terminal device that corresponds to the master
pseudo-terminal device associated with masterfd int
the buf argument copying up to
buflen characters. The buf is
always NUL terminated.
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.
If successful, ptsname_r() places a
nul-terminated string containing the pathname of the slave pseudo-terminal
device in buf and returns 0.
If an error occurs ptsname_r() will return an error
number indicating what went wrong.
ptsname() and ptsname_r()
functions will fail if:
EACCESS]EBADF]EINVAL]In addition the ptsname_r() function will
return:
ptsname() are a
NetBSD extension. The
ptsname() function is equivalent to:
struct ptmget pm; return ioctl(masterfd, TIOCPTSNAME, &pm) == -1 ? NULL : pm.sn;
Both the ptsname() and
ptsname_r() functions will also return the name of
the slave pseudo-terminal if a file descriptor to the slave pseudo-terminal
is passed to masterfd.
This is a convenient extension because it allows one to use the file descriptor obtained by open(2) /dev/tty to obtain the name of the pseudo-terminal for the current process.
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”).
| February 7, 2018 | NetBSD 9.0 |