Linux and UNIX Man Pages

Test Your Knowledge in Computers #899
Difficulty: Easy
Programs included in BusyBox can be run simply by adding their name as an argument to the BusyBox executable.
True or False?
Linux & Unix Commands - Search Man Pages

readlinkat(2) [linux man page]

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

NAME
readlinkat - read value of a symbolic link relative to a directory file descriptor SYNOPSIS
#include <fcntl.h> /* Definition of AT_* constants */ #include <unistd.h> int readlinkat(int dirfd, const char *pathname, char *buf, size_t bufsiz); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): readlinkat(): Since glibc 2.10: _XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L Before glibc 2.10: _ATFILE_SOURCE DESCRIPTION
The readlinkat() system call operates in exactly the same way as readlink(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 readlink(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 readlink(2)). If pathname is absolute, then dirfd is ignored. RETURN VALUE
On success, readlinkat() returns the number of bytes placed in buf. On error, -1 is returned and errno is set to indicate the error. ERRORS
The same errors that occur for readlink(2) can also occur for readlinkat(). The following additional errors can occur for readlinkat(): EBADF dirfd is not a valid file descriptor. ENOTDIR pathname is relative and dirfd is a file descriptor referring to a file other than a directory. VERSIONS
readlinkat() was added to Linux in kernel 2.6.16. CONFORMING TO
POSIX.1-2008. NOTES
See openat(2) for an explanation of the need for readlinkat(). SEE ALSO
openat(2), readlink(2), path_resolution(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 READLINKAT(2)

Check Out this Related Man Page

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

NAME
mkdirat - create a directory relative to a directory file descriptor SYNOPSIS
#include <fcntl.h> /* Definition of AT_* constants */ #include <sys/stat.h> int mkdirat(int dirfd, const char *pathname, mode_t mode); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): mkdirat(): Since glibc 2.10: _XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L Before glibc 2.10: _ATFILE_SOURCE DESCRIPTION
The mkdirat() system call operates in exactly the same way as mkdir(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 mkdir(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 mkdir(2)). If pathname is absolute, then dirfd is ignored. RETURN VALUE
On success, mkdirat() returns 0. On error, -1 is returned and errno is set to indicate the error. ERRORS
The same errors that occur for mkdir(2) can also occur for mkdirat(). The following additional errors can occur for mkdirat(): EBADF dirfd is not a valid file descriptor. ENOTDIR pathname is relative and dirfd is a file descriptor referring to a file other than a directory. VERSIONS
mkdirat() was added to Linux in kernel 2.6.16; library support was added to glibc in version 2.4. CONFORMING TO
POSIX.1-2008. NOTES
See openat(2) for an explanation of the need for mkdirat(). SEE ALSO
mkdir(2), openat(2), path_resolution(7) COLOPHON
This page is part of release 3.44 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 2012-05-04 MKDIRAT(2)

Featured Tech Videos