Sun Microsystems, Inc.
spacerspacer
spacer   www.sun.com docs.sun.com | | |  
spacer
black dot
   
A   B   C   D   E   F   G   H   I   J   K   L   M   N   O   P   Q   R   S   T   U   V   W   X   Y   Z
    
 
Standard C Library Functionsttyname(3C)


NAME

 ttyname, ttyname_r - find pathname of a terminal

SYNOPSIS

 
#include <unistd.h> 
char *ttyname(int fildes);
 char *ttyname_r(int fildes, char *name, int namelen);

POSIX

 
 
cc [ flag ...] file ... -D_POSIX_PTHREAD_SEMANTICS [ library ... ]
int ttyname_r(int fildes, char *name, size_t namesize);

DESCRIPTION

 

The ttyname() function returns a pointer to a string containing the null-terminated path name of the terminal device associated with file descriptor fildes. The return value may point to static data whose content is overwritten by each call.

The ttyname_r() function has the same functionality as ttyname() except that the caller must supply a buffer name with length namelen to store the result; this buffer must be at least _POSIX_PATH_MAX in size (defined in <limits.h>). The POSIX version (see standards(5)) of ttyname_r() takes a namesize parameter of type size_t.

RETURN VALUES

 

Upon successful completion, ttyname() and ttyname_r() return a pointer to a string. Otherwise, a null pointer is returned and errno is set to indicate the error.

The POSIX ttyname_r() returns zero if successful, or the error number upon failure.

ERRORS

 

The ttyname_r() function will fail if:

ERANGE
The size of the buffer is smaller than the result to be returned.

The ttyname() function may fail if:

EBADF
The fildes argument is not a valid file descriptor.
ENOTTY
The fildes argument does not refer to a terminal device.

FILES

 
/dev/*
device file

ATTRIBUTES

 

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPEATTRIBUTE VALUE
MT-LevelSee NOTES below.

SEE ALSO

 

Intro(3), gettext(3C), setlocale(3C), attributes(5), standards(5)

NOTES

 

When compiling multithreaded programs, see Intro(3), Notes On Multithreaded Applications.

If the application is linked with -lintl, then messages printed from this function are in the native language specified by the LC_MESSAGES locale category; see setlocale(3C).

The return value points to static data whose content is overwritten by each call.

The ttyname() is Unsafe in multithreaded applications. The ttyname_r() function is MT-Safe, and should be used instead.

Solaris 2.4 and earlier releases provided definitions of the ttyname_r() interface as specified in POSIX.1c Draft 6. The final POSIX.1c standard changed the interface as described above. Support for the Draft 6 interface is provided for compatibility only and may not be supported in future releases. New applications and libraries should use the POSIX standard interface.


SunOS 5.9Go To TopLast Changed 20 Mar 1997

 
      
      
Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.