minix/lib/libc/sys/chdir.2
Ben Gras 2fe8fb192f Full switch to clang/ELF. Drop ack. Simplify.
There is important information about booting non-ack images in
docs/UPDATING. ack/aout-format images can't be built any more, and
booting clang/ELF-format ones is a little different. Updating to the
new boot monitor is recommended.

Changes in this commit:

	. drop boot monitor -> allowing dropping ack support
	. facility to copy ELF boot files to /boot so that old boot monitor
	  can still boot fairly easily, see UPDATING
	. no more ack-format libraries -> single-case libraries
	. some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases
	. drop several ack toolchain commands, but not all support
	  commands (e.g. aal is gone but acksize is not yet).
	. a few libc files moved to netbsd libc dir
	. new /bin/date as minix date used code in libc/
	. test compile fix
	. harmonize includes
	. /usr/lib is no longer special: without ack, /usr/lib plays no
	  kind of special bootstrapping role any more and bootstrapping
	  is done exclusively through packages, so releases depend even
	  less on the state of the machine making them now.
	. rename nbsd_lib* to lib*
	. reduce mtree
2012-02-14 14:52:02 +01:00

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Groff

.\" $NetBSD: chdir.2,v 1.21 2010/05/31 12:16:20 njoly Exp $
.\"
.\" Copyright (c) 1980, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
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.\" modification, are permitted provided that the following conditions
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.\" notice, this list of conditions and the following disclaimer.
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.\" notice, this list of conditions and the following disclaimer in the
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.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\"
.\" @(#)chdir.2 8.2 (Berkeley) 12/11/93
.\"
.Dd December 11, 1993
.Dt CHDIR 2
.Os
.Sh NAME
.Nm chdir ,
.Nm fchdir
.Nd change current working directory
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In unistd.h
.Ft int
.Fn chdir "const char *path"
.Ft int
.Fn fchdir "int fd"
.Sh DESCRIPTION
The
.Fa path
argument points to the pathname of a directory.
The
.Fn chdir
function
causes the named directory
to become the current working directory, that is,
the starting point for path searches of pathnames not beginning with
a slash,
.Ql / .
.Pp
The
.Fn fchdir
function
causes the directory referenced by
.Fa fd
to become the current working directory,
the starting point for path searches of pathnames not beginning with
a slash,
.Ql / .
.Pp
In order for a directory to become the current directory,
a process must have execute (search) access to the directory.
.Sh RETURN VALUES
Upon successful completion, a value of 0 is returned.
Otherwise, a value of \-1 is returned and
.Va errno
is set to indicate
the error.
.Sh ERRORS
.Fn chdir
will fail and the current working directory will be unchanged if
one or more of the following are true:
.Bl -tag -width Er
.It Bq Er ENOTDIR
A component of the path prefix is not a directory.
.It Bq Er ENAMETOOLONG
A component of a pathname exceeded
.Brq Dv NAME_MAX
characters, or an entire path name exceeded
.Brq Dv PATH_MAX
characters.
.It Bq Er ENOENT
The named directory does not exist.
.It Bq Er ELOOP
Too many symbolic links were encountered in translating the pathname.
.It Bq Er EACCES
Search permission is denied for any component of
the path name.
.It Bq Er EFAULT
.Fa path
points outside the process's allocated address space.
.It Bq Er EIO
An I/O error occurred while reading from or writing to the file system.
.El
.Pp
.Fn fchdir
will fail and the current working directory will be unchanged if
one or more of the following are true:
.Bl -tag -width Er
.It Bq Er EACCES
Search permission is denied for the directory referenced by the
file descriptor.
.It Bq Er ENOTDIR
The file descriptor does not reference a directory.
.It Bq Er EBADF
The argument
.Fa fd
is not a valid file descriptor.
.It Bq Er EPERM
The argument
.Fa fd
references a directory which is not at or below the current process's
root directory.
.El
.Sh SEE ALSO
.Xr chroot 2
.Sh STANDARDS
The
.Fn chdir
function conforms to
.St -p1003.1-90 .
.Sh HISTORY
The
.Fn fchdir
function call
appeared in
.Bx 4.2 .