Determines whether or not an open file descriptor is associated with a terminal.
Syntax |
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#include <unistd.h>
int isatty (int fildes);
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Parameters |
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- fildes
An open file descriptor.
Return Values |
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- 1
The specified file descriptor is associated with a terminal.
- 0
The specified file descriptor is not associated with a terminal.
- -1
The specified file descriptor is invalid, and errno is set to indicate the error condition.
Description |
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The isatty() function returns a value indicating whether or not the open file descriptor fildes is associated with a terminal.
Implementation Considerations |
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Refer to the EBADF error description below.
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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POSIX.1 (Section 4.7.2)
