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freebsd-dev/lib/libufs/bread.3

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Commit rudimentary libufs manual pages, except for that for getino(3)/putino(3), inode.c has been reworked in Perforce to the point where a manual page may not be accurate. Certainly putino(3) has not even been merged back yet. These will need a lot of improvement for most applications, but they document the API enough to get someone on their feet, most likely. The best documentation still exists in the form of libufs(3) consumers in the base system.
2003-06-09 09:59:11 +00:00
.\" Author: Juli Mallett <jmallett@FreeBSD.org>
.\" Date: June 04, 2003
.\" Description:
.\" Manual page for libufs functions:
.\" bread(3)
.\" bwrite(3)
.\"
Left out the critical part of my "public domain" template, a notice saying that this file is (these files are) in the public domain. PR: 53149
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.\" This file is in the public domain.
.\"
Commit rudimentary libufs manual pages, except for that for getino(3)/putino(3), inode.c has been reworked in Perforce to the point where a manual page may not be accurate. Certainly putino(3) has not even been merged back yet. These will need a lot of improvement for most applications, but they document the API enough to get someone on their feet, most likely. The best documentation still exists in the form of libufs(3) consumers in the base system.
2003-06-09 09:59:11 +00:00
.\" $FreeBSD$
.\"
Fixed spelling of the document date.
2004-07-02 18:00:03 +00:00
.Dd June 4, 2003
Commit rudimentary libufs manual pages, except for that for getino(3)/putino(3), inode.c has been reworked in Perforce to the point where a manual page may not be accurate. Certainly putino(3) has not even been merged back yet. These will need a lot of improvement for most applications, but they document the API enough to get someone on their feet, most likely. The best documentation still exists in the form of libufs(3) consumers in the base system.
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.Dt BREAD 3
.Os
.Sh NAME
.Nm bread , bwrite
Markup fixes.
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.Nd read and write blocks of a UFS file system
Commit rudimentary libufs manual pages, except for that for getino(3)/putino(3), inode.c has been reworked in Perforce to the point where a manual page may not be accurate. Certainly putino(3) has not even been merged back yet. These will need a lot of improvement for most applications, but they document the API enough to get someone on their feet, most likely. The best documentation still exists in the form of libufs(3) consumers in the base system.
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.Sh LIBRARY
.Lb libufs
.Sh SYNOPSIS
.In sys/param.h
.In sys/mount.h
.In ufs/ufs/ufsmount.h
.In ufs/ufs/dinode.h
.In ufs/ffs/fs.h
.In libufs.h
.Ft ssize_t
.Fn bread "struct uufsd *disk" "ufs2_daddr_t blockno" "void *data" "size_t size"
.Ft ssize_t
Markup fixes.
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.Fo bwrite
.Fa "struct uufsd *disk" "ufs2_daddr_t blockno"
.Fa "const void *data" "size_t size"
.Fc
Add a berase() function which uses ioctl(DIOCGDELETE) to erase a slab of the disk.
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.Ft int
.Fo berase
.Fa "struct uufsd *disk" "ufs2_daddr_t blockno" "ufs2_daddr_t size"
.Fc
Commit rudimentary libufs manual pages, except for that for getino(3)/putino(3), inode.c has been reworked in Perforce to the point where a manual page may not be accurate. Certainly putino(3) has not even been merged back yet. These will need a lot of improvement for most applications, but they document the API enough to get someone on their feet, most likely. The best documentation still exists in the form of libufs(3) consumers in the base system.
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.Sh DESCRIPTION
The
Add a berase() function which uses ioctl(DIOCGDELETE) to erase a slab of the disk.
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.Fn bread ,
Commit rudimentary libufs manual pages, except for that for getino(3)/putino(3), inode.c has been reworked in Perforce to the point where a manual page may not be accurate. Certainly putino(3) has not even been merged back yet. These will need a lot of improvement for most applications, but they document the API enough to get someone on their feet, most likely. The best documentation still exists in the form of libufs(3) consumers in the base system.
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.Fn bwrite
Add a berase() function which uses ioctl(DIOCGDELETE) to erase a slab of the disk.
2007-12-16 18:02:37 +00:00
and
.Fn berase
functions provide a block read, write and erase API for
Commit rudimentary libufs manual pages, except for that for getino(3)/putino(3), inode.c has been reworked in Perforce to the point where a manual page may not be accurate. Certainly putino(3) has not even been merged back yet. These will need a lot of improvement for most applications, but they document the API enough to get someone on their feet, most likely. The best documentation still exists in the form of libufs(3) consumers in the base system.
2003-06-09 09:59:11 +00:00
.Xr libufs 3
consumers.
They operate on a userland UFS disk structure, and perform the read
and write at a given block address, which uses the current
Markup fixes.
2004-07-05 06:53:34 +00:00
.Va d_bsize
Commit rudimentary libufs manual pages, except for that for getino(3)/putino(3), inode.c has been reworked in Perforce to the point where a manual page may not be accurate. Certainly putino(3) has not even been merged back yet. These will need a lot of improvement for most applications, but they document the API enough to get someone on their feet, most likely. The best documentation still exists in the form of libufs(3) consumers in the base system.
2003-06-09 09:59:11 +00:00
value of the structure.
Markup fixes.
2004-07-05 06:53:34 +00:00
.Sh RETURN VALUES
Commit rudimentary libufs manual pages, except for that for getino(3)/putino(3), inode.c has been reworked in Perforce to the point where a manual page may not be accurate. Certainly putino(3) has not even been merged back yet. These will need a lot of improvement for most applications, but they document the API enough to get someone on their feet, most likely. The best documentation still exists in the form of libufs(3) consumers in the base system.
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The
.Fn bread
and
.Fn bwrite
Markup fixes.
2004-07-05 06:53:34 +00:00
functions return the amount read or written, or \-1 in case of any error,
Commit rudimentary libufs manual pages, except for that for getino(3)/putino(3), inode.c has been reworked in Perforce to the point where a manual page may not be accurate. Certainly putino(3) has not even been merged back yet. These will need a lot of improvement for most applications, but they document the API enough to get someone on their feet, most likely. The best documentation still exists in the form of libufs(3) consumers in the base system.
2003-06-09 09:59:11 +00:00
including short read.
Add a berase() function which uses ioctl(DIOCGDELETE) to erase a slab of the disk.
2007-12-16 18:02:37 +00:00
.Pp
The
.Fn berase
function returns non-zero on error.
Commit rudimentary libufs manual pages, except for that for getino(3)/putino(3), inode.c has been reworked in Perforce to the point where a manual page may not be accurate. Certainly putino(3) has not even been merged back yet. These will need a lot of improvement for most applications, but they document the API enough to get someone on their feet, most likely. The best documentation still exists in the form of libufs(3) consumers in the base system.
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.Sh ERRORS
The function
.Fn bread
may fail and set
.Va errno
for any of the errors specified for the library functions
Various cleanups of careless mistakes/omissions. PR: 53149 Submitted by: Lukas Ertl <l.ertl@univie.ac.at>
2003-06-10 18:36:16 +00:00
.Xr ufs_disk_write 3
Commit rudimentary libufs manual pages, except for that for getino(3)/putino(3), inode.c has been reworked in Perforce to the point where a manual page may not be accurate. Certainly putino(3) has not even been merged back yet. These will need a lot of improvement for most applications, but they document the API enough to get someone on their feet, most likely. The best documentation still exists in the form of libufs(3) consumers in the base system.
2003-06-09 09:59:11 +00:00
or
.Xr pread 2 .
.Pp
The function
.Fn bwrite
may fail and set
.Va errno
for any of the errors specified for the library function
.Xr pwrite 2 .
Add a berase() function which uses ioctl(DIOCGDELETE) to erase a slab of the disk.
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.Pp
The function
.Fn berase
may fail and set
.Va errno
for any of the errors specified for the library function
.Xr ioctl 2 .
.Pp
Additionally all three functions may follow the
Commit rudimentary libufs manual pages, except for that for getino(3)/putino(3), inode.c has been reworked in Perforce to the point where a manual page may not be accurate. Certainly putino(3) has not even been merged back yet. These will need a lot of improvement for most applications, but they document the API enough to get someone on their feet, most likely. The best documentation still exists in the form of libufs(3) consumers in the base system.
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.Xr libufs 3
error methodologies in situations where the amount of data written
is not equal to the amount requested, or in case of a device error.
.Sh SEE ALSO
.Xr libufs 3 ,
.Xr ufs_disk_write 3
.Sh HISTORY
These functions first appeared as part of
.Xr libufs 3
in
.Fx 5.0 .
.Sh AUTHORS
.An Juli Mallett Aq jmallett@FreeBSD.org
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