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diff --git a/man3/isatty.3 b/man3/isatty.3 new file mode 100644 index 0000000..fe44c88 --- /dev/null +++ b/man3/isatty.3 @@ -0,0 +1,69 @@ +'\" t +.\" Copyright 2008, Linux Foundation, written by Michael Kerrisk +.\" <mtk.manpages@gmail.com> +.\" +.\" SPDX-License-Identifier: Linux-man-pages-copyleft +.\" +.TH isatty 3 2023-07-20 "Linux man-pages 6.05.01" +.SH NAME +isatty \- test whether a file descriptor refers to a terminal +.SH LIBRARY +Standard C library +.RI ( libc ", " \-lc ) +.SH SYNOPSIS +.nf +.B #include <unistd.h> +.PP +.BI "int isatty(int " fd ); +.fi +.SH DESCRIPTION +The +.BR isatty () +function tests whether +.I fd +is an open file descriptor referring to a terminal. +.SH RETURN VALUE +.BR isatty () +returns 1 if +.I fd +is an open file descriptor referring to a terminal; +otherwise 0 is returned, and +.I errno +is set to indicate the error. +.SH ERRORS +.TP +.B EBADF +.I fd +is not a valid file descriptor. +.TP +.B ENOTTY +.I fd +refers to a file other than a terminal. +On some older kernels, some types of files +.\" e.g., FIFOs and pipes on 2.6.32 +resulted in the error +.B EINVAL +in this case (which is a violation of POSIX, which specifies the error +.BR ENOTTY ). +.SH ATTRIBUTES +For an explanation of the terms used in this section, see +.BR attributes (7). +.TS +allbox; +lbx lb lb +l l l. +Interface Attribute Value +T{ +.na +.nh +.BR isatty () +T} Thread safety MT-Safe +.TE +.sp 1 +.SH STANDARDS +POSIX.1-2008. +.SH HISTORY +POSIX.1-2001, SVr4, 4.3BSD. +.SH SEE ALSO +.BR fstat (2), +.BR ttyname (3) |