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ttyname(3c)
Standard C Library Functions ttyname(3C)
NAME
ttyname, ttyname_r - find pathname of a terminal
SYNOPSIS
#include <unistd.h>
char *ttyname(int fildes);
int ttyname_r(int fildes, char *name, size_t namesize);
POSIX.1c Draft 6
cc [ flag...] file ... -D__USE_DRAFT6_PROTOTYPES__ [ library ... ]
char *ttyname_r(int fildes, char *name, int namelen);
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 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 size namesize to store
the result; this buffer must be at least _POSIX_PATH_MAX in size
(defined in <limits.h>).
RETURN VALUES
Upon successful completion, ttyname() returns a pointer to a string.
Otherwise, a null pointer is returned and errno is set to indicate the
error.
The ttyname_r() function returns 0 if successful or the error number
upon failure; it does not set errno.
ERRORS
The ttyname() and ttyname_r() functions may fail if:
EBADF The fildes argument is not a valid file descriptor. This con‐
dition 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 charac‐
ter.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Interface StabilityCommitted _ MT-LevelSafe _ Standard‐
See standards(7).
SEE ALSO
gettext(3C), setlocale(3C), ttysrch(5), attributes(7), standards(7)
NOTES
Messages printed from this function are in the native language speci‐
fied by the LC_MESSAGES locale category. See setlocale(3C).
The return value of ttyname() points to thread-specific data whose con‐
tent 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.
Prior to Oracle Solaris 11.4, the default compilation environment pro‐
vided a definition of the ttyname_r() function as specified in POSIX.1c
Draft 6. The final POSIX.1c standard changed the interface for tty‐
name_r(). To allow applications that were written to use the obsolete
Draft-6 interfaces to continue to be compiled and run, the
__USE_DRAFT6_PROTOTYPES__ macro must be defined:
cc -D__USE_DRAFT6_PROTOTYPES__ ...
Support for the Draft-6 interfaces is provided for source compatibility
only and might not be supported in future releases. Old applications
should be converted to use the standard definitions.
Oracle Solaris 11.4 17 Aug 2018 ttyname(3C)