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bwrite (3)

>> bwrite (3) ( FreeBSD man: Библиотечные вызовы )

BSD mandoc

NAME



bread , bwrite

 - read and write blocks of a UFS file system

LIBRARY

Lb libufs

SYNOPSIS

   #include <sys/param.h>
   #include <sys/mount.h>
   #include <ufs/ufs/ufsmount.h>
   #include <ufs/ufs/dinode.h>
   #include <ufs/ffs/fs.h>
   #include <libufs.h>
ssize_t bread (struct uufsd *disk ufs2_daddr_t blockno void *data size_t size);
ssize_t Fo bwrite Fa struct uufsd *disk ufs2_daddr_t blockno Fa const void *data size_t size Fc

DESCRIPTION

The bread ();
and bwrite ();
functions provide a block read and write API for 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 d_bsize value of the structure.

RETURN VALUES

The bread ();
and bwrite ();
functions return the amount read or written, or -1 in case of any error, including short read.

ERRORS

The function bread ();
may fail and set errno for any of the errors specified for the library functions ufs_disk_write3 or pread(2). Additionally, it may follow the libufs(3) error methodologies in situations where the amount of data read is not equal to the amount requested, or in case of device error.

The function bwrite ();
may fail and set errno for any of the errors specified for the library function pwrite(2). Additionally, it may follow the 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.