freebsd-dev/lib/libc/sys/chdir.2
John Baldwin e42b096439 Document EINTEGRITY errors for many system calls.
EINTEGRITY was previously documented as a UFS-specific error for
mount(2).  This documents EINTEGRITY as a filesystem-independent error
that may be reported by the backing store of a filesystem.

While here, document EIO as a filesystem-independent error for both
mount(2) and posix_fadvise(2).  EIO was previously only documented for
UFS for mount(2).

Reviewed by:	mckusick
Suggested by:	mckusick
MFC after:	2 weeks
Sponsored by:	Chelsio Communications
Differential Revision:	https://reviews.freebsd.org/D24168
2020-03-30 21:44:00 +00:00

135 lines
3.9 KiB
Groff

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.\" @(#)chdir.2 8.2 (Berkeley) 12/11/93
.\" $FreeBSD$
.\"
.Dd March 30, 2020
.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
system call
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
system call
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
.Rv -std
.Sh ERRORS
The
.Fn chdir
system call
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 255 characters,
or an entire path name exceeded 1023 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
The
.Fa path
argument
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.
.It Bq Er EINTEGRITY
Corrupted data was detected while reading from the file system.
.El
.Pp
The
.Fn fchdir
system call
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.
.El
.Sh SEE ALSO
.Xr chroot 2
.Sh STANDARDS
The
.Fn chdir
system call is expected to conform to
.St -p1003.1-90 .
.Sh HISTORY
The
.Fn chdir
system call appeared in
.At v1 .
The
.Fn fchdir
system call appeared in
.Bx 4.2 .