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Diffstat (limited to 'man3/isfdtype.3')
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diff --git a/man3/isfdtype.3 b/man3/isfdtype.3 new file mode 100644 index 0000000..e8eb1f4 --- /dev/null +++ b/man3/isfdtype.3 @@ -0,0 +1,77 @@ +.\" Copyright (C) 2014 Michael Kerrisk <mtk.manpages@gmail.com> +.\" +.\" SPDX-License-Identifier: Linux-man-pages-copyleft +.\" +.TH isfdtype 3 2023-03-30 "Linux man-pages 6.05.01" +.SH NAME +isfdtype \- test file type of a file descriptor +.SH LIBRARY +Standard C library +.RI ( libc ", " \-lc ) +.SH SYNOPSIS +.nf +.B #include <sys/stat.h> +.B #include <sys/socket.h> +.PP +.BI "int isfdtype(int " fd ", int " fdtype ); +.fi +.PP +.RS -4 +Feature Test Macro Requirements for glibc (see +.BR feature_test_macros (7)): +.RE +.PP +.BR isfdtype (): +.nf + Since glibc 2.20: + _DEFAULT_SOURCE + Before glibc 2.20: + _BSD_SOURCE || _SVID_SOURCE +.fi +.SH DESCRIPTION +The +.BR isfdtype () +function tests whether the file descriptor +.I fd +refers to a file of type +.IR fdtype . +The +.I fdtype +argument specifies one of the +.B S_IF* +constants defined in +.I <sys/stat.h> +and documented in +.BR stat (2) +(e.g., +.BR S_IFREG ). +.SH RETURN VALUE +The +.BR isfdtype () +function returns 1 if the file descriptor +.I fd +is of type +.I fdtype +and 0 if it is not. +On failure, \-1 is returned and +.I errno +is set to indicate the error. +.SH ERRORS +The +.BR isfdtype () +function can fail with any of the same errors as +.BR fstat (2). +.SH VERSIONS +Portable applications should use +.BR fstat (2) +instead. +.SH STANDARDS +None. +.SH HISTORY +It appeared in the draft POSIX.1g standard. +It is present on OpenBSD and Tru64 UNIX +(where the required header file in both cases is just +.IR <sys/stat.h> , +as shown in the POSIX.1g draft). +.SH SEE ALSO +.BR fstat (2) |