BREAD (3) | C library functions | Unix Manual Pages | :man|

Alphabetical Categories About us



BREAD (3) \| C library functions \| Unix Manual Pages \| :man▋ NAME bread, bwrite - read and write blocks of a UFS file system CONTENTS Library Synopsis Description Return Values Errors See Also History Authors LIBRARY .Lb libufs 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 ssize_t `bread "struct uufsd disk" "ufs2_daddr_t blockno" "void data" "size_t size"` ssize_t .Fo bwrite "struct uufsd disk" "ufs2_daddr_t blockno"* "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_write(3) 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. SEE ALSO libufs(3), ufs_disk_write(3) HISTORY libufs(3) AUTHORS

Created by Blin Media, 2008-2013