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isfdtype(3) [linux man page]

ISFDTYPE(3)						     Linux Programmer's Manual						       ISFDTYPE(3)

NAME
isfdtype - test file type of a file descriptor SYNOPSIS
#include <sys/stat.h> #include <sys/socket.h> int isfdtype(int fd, int fdtype); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): isfdtype(): Since glibc 2.20: _DEFAULT_SOURCE Before glibc 2.20: _BSD_SOURCE || _SVID_SOURCE DESCRIPTION
The isfdtype() function tests whether the file descriptor fd refers to a file of type fdtype. The fdtype argument specifies one of the S_IF* constants defined in <sys/stat.h> and documented in stat(2) (e.g., S_IFREG). RETURN VALUE
The isfdtype() function returns 1 if the file descriptor fd is of type fdtype and 0 if it is not. On error, -1 is returned and errno is set to indicate the cause. ERRORS
The isfdtype() function can fail with any of the same errors as fstat(3). CONFORMING TO
The isfdtype() function is not specified in any standard, but did appear in the draft POSIX.1g standard. It is present on OpenBSD and Tru64 UNIX (where the required header file in both cases is just <sys/stat.h>, as shown in the POSIX.1g draft), and possibly other systems. NOTES
Portable applications should use fstat(3) instead. SEE ALSO
fstat(3) Linux 2014-03-13 ISFDTYPE(3)

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FSTATAT(2)						     Linux Programmer's Manual							FSTATAT(2)

NAME
fstatat - get file status relative to a directory file descriptor SYNOPSIS
#include <fcntl.h> /* Definition of AT_* constants */ #include <sys/stat.h> int fstatat(int dirfd, const char *pathname, struct stat *buf, int flags); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): fstatat(): Since glibc 2.10: _XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L Before glibc 2.10: _ATFILE_SOURCE DESCRIPTION
The fstatat() system call operates in exactly the same way as stat(2), except for the differences described in this manual page. If the pathname given in pathname is relative, then it is interpreted relative to the directory referred to by the file descriptor dirfd (rather than relative to the current working directory of the calling process, as is done by stat(2) for a relative pathname). If pathname is relative and dirfd is the special value AT_FDCWD, then pathname is interpreted relative to the current working directory of the calling process (like stat(2)). If pathname is absolute, then dirfd is ignored. flags can either be 0, or include the following flag: AT_SYMLINK_NOFOLLOW If pathname is a symbolic link, do not dereference it: instead return information about the link itself, like lstat(2). (By default, fstatat() dereferences symbolic links, like stat(2).) RETURN VALUE
On success, fstatat() returns 0. On error, -1 is returned and errno is set to indicate the error. ERRORS
The same errors that occur for stat(2) can also occur for fstatat(). The following additional errors can occur for fstatat(): EBADF dirfd is not a valid file descriptor. EINVAL Invalid flag specified in flags. ENOTDIR pathname is relative and dirfd is a file descriptor referring to a file other than a directory. VERSIONS
fstatat() was added to Linux in kernel 2.6.16. CONFORMING TO
POSIX.1-2008. A similar system call exists on Solaris. NOTES
See openat(2) for an explanation of the need for fstatat(). SEE ALSO
openat(2), stat(2), path_resolution(7), symlink(7) COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. Linux 2009-12-13 FSTATAT(2)
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