Query: isatty
OS: posix
Section: 3p
Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar
ISATTY(3P) POSIX Programmer's Manual ISATTY(3P)PROLOGThis manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the correspond- ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.NAMEisatty -- test for a terminal deviceSYNOPSIS#include <unistd.h> int isatty(int fildes);DESCRIPTIONThe isatty() function shall test whether fildes, an open file descriptor, is associated with a terminal device.RETURN VALUEThe isatty() function shall return 1 if fildes is associated with a terminal; otherwise, it shall return 0 and may set errno to indicate the error.ERRORSThe isatty() function may fail if: EBADF The fildes argument is not a valid open file descriptor. ENOTTY The file associated with the fildes argument is not a terminal. The following sections are informative.EXAMPLESNone.APPLICATION USAGEThe isatty() function does not necessarily indicate that a human being is available for interaction via fildes. It is quite possible that non-terminal devices are connected to the communications line.RATIONALENone.FUTURE DIRECTIONSNone.SEE ALSOThe Base Definitions volume of POSIX.1-2008, <unistd.h>COPYRIGHTPortions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technol- ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Stan- dard is the referee document. The original Standard can be obtained online at http://www.unix.org/online.html . Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .IEEE/The Open Group 2013 ISATTY(3P)
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