Determines terminal device name.
Syntax |
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#include <unistd.h>
char *ttyname(int fildes);
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Parameters |
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- fildes
An open file descriptor.
Return Values |
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The ttyname() function returns a NULL pointer if filedes is not a valid file descriptor associated with a terminal or if the pathname cannot be determined.
Description |
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The ttyname function returns a pointer to a string containing a null-terminated pathname of the terminal associated with file descriptor fildes.
Implementation Considerations |
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None.
Errors |
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If an error occurs, errno is set to the following value:
| EBADF | CAUSE
| The fildes parameter is not a valid open file descriptor. |
| | ACTION
| Check to see if fildes has been altered or not initialized.
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See Also |
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ctermid(), isatty(), POSIX.1
