diff options
Diffstat (limited to '')
| -rw-r--r-- | man2/readdir.2 | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/man2/readdir.2 b/man2/readdir.2 new file mode 100644 index 0000000..6b06ff4 --- /dev/null +++ b/man2/readdir.2 @@ -0,0 +1,116 @@ +.\" Copyright (C) 1995 Andries Brouwer (aeb@cwi.nl) +.\" +.\" SPDX-License-Identifier: Linux-man-pages-copyleft +.\" +.\" Written 11 June 1995 by Andries Brouwer <aeb@cwi.nl> +.\" Modified 22 July 1995 by Michael Chastain <mec@duracef.shout.net>: +.\" In 1.3.X, returns only one entry each time; return value is different. +.\" Modified 2004-12-01, mtk, fixed headers listed in SYNOPSIS +.\" +.TH readdir 2 2023-03-30 "Linux man-pages 6.05.01" +.SH NAME +readdir \- read directory entry +.SH LIBRARY +Standard C library +.RI ( libc ", " \-lc ) +.SH SYNOPSIS +.nf +.BR "#include <sys/syscall.h>" " /* Definition of " SYS_* " constants */" +.B #include <unistd.h> +.PP +.BI "int syscall(SYS_readdir, unsigned int " fd , +.BI " struct old_linux_dirent *" dirp ", unsigned int " count ); +.fi +.PP +.IR Note : +There is no definition of +.BR "struct old_linux_dirent" ; +see NOTES. +.SH DESCRIPTION +This is not the function you are interested in. +Look at +.BR readdir (3) +for the POSIX conforming C library interface. +This page documents the bare kernel system call interface, +which is superseded by +.BR getdents (2). +.PP +.BR readdir () +reads one +.I old_linux_dirent +structure from the directory +referred to by the file descriptor +.I fd +into the buffer pointed to by +.IR dirp . +The argument +.I count +is ignored; at most one +.I old_linux_dirent +structure is read. +.PP +The +.I old_linux_dirent +structure is declared (privately in Linux kernel file +.BR fs/readdir.c ) +as follows: +.PP +.in +4n +.EX +struct old_linux_dirent { + unsigned long d_ino; /* inode number */ + unsigned long d_offset; /* offset to this \fIold_linux_dirent\fP */ + unsigned short d_namlen; /* length of this \fId_name\fP */ + char d_name[1]; /* filename (null\-terminated) */ +} +.EE +.in +.PP +.I d_ino +is an inode number. +.I d_offset +is the distance from the start of the directory to this +.IR old_linux_dirent . +.I d_reclen +is the size of +.IR d_name , +not counting the terminating null byte (\[aq]\e0\[aq]). +.I d_name +is a null-terminated filename. +.SH RETURN VALUE +On success, 1 is returned. +On end of directory, 0 is returned. +On error, \-1 is returned, and +.I errno +is set to indicate the error. +.SH ERRORS +.TP +.B EBADF +Invalid file descriptor +.IR fd . +.TP +.B EFAULT +Argument points outside the calling process's address space. +.TP +.B EINVAL +Result buffer is too small. +.TP +.B ENOENT +No such directory. +.TP +.B ENOTDIR +File descriptor does not refer to a directory. +.SH VERSIONS +You will need to define the +.I old_linux_dirent +structure yourself. +However, probably you should use +.BR readdir (3) +instead. +.PP +This system call does not exist on x86-64. +.SH STANDARDS +Linux. +.SH SEE ALSO +.BR getdents (2), +.BR readdir (3) |