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#include <unistd.h> char *ttyname(int fildes);
char *ttyname_r(int fildes, char *name, int namelen);
cc [ flag...] file ... -D_POSIX_PTHREAD_SEMANTICS [ library ... ] int ttyname_r(int fildes, char *name, size_t namesize);
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 points to thread-specific data whose content is overwritten by each call from the same thread.
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 standard-conforming version (see standards(5)) of ttyname_r() takes a namesize parameter of type size_t.
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 standard-conforming ttyname_r() returns 0 if successful or the error number upon failure.
The ttyname() and ttyname_r() functions may fail if:
EBADF
The fildes argument is not a valid file descriptor. This condition is reported.
ENOTTY
The fildes argument does not refer to a terminal device. This condition is reported.
The ttyname_r() function may fail if:
ERANGE
The value of namesize is smaller than the length of the string to be returned including the terminating null character.
See attributes(5) for descriptions of the following attributes:
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| Interface Stability | Standard |
| MT-Level | Safe |
Intro(3), gettext(3C), setlocale(3C), attributes(5), standards(5)
When compiling multithreaded applications, see Intro(3), Notes On Multithreaded Applications.
Messages printed from this function are in the native language specified by the LC_MESSAGES locale category. See setlocale(3C).
The return value of ttyname() points to thread-specific data whose content is overwritten by each call from the same thread. This function is safe to use in multithreaded applications, but its use is discouraged. The ttyname_r() function should 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 might not be supported in future releases. New applications and libraries should use the standard-conforming interface.