SBREAD(3) BSD Library Functions Manual SBREAD(3) NAME sbread, sbwrite -- read and write superblocks of a UFS file system LIBRARY UFS File System Access Library (libufs, -lufs) 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> int sbread(struct uufsd *disk); int sbwrite(struct uufsd *disk, int all); DESCRIPTION The sbread() and sbwrite() functions provide superblock reads and writes for libufs(3) consumers. The sbread() and sbwrite() functions oper- ate on the superblock field, d_sb, associated with a given userland UFS disk structure. Additionally, the sbwrite() function will write to all superblock locations if the all value is non-zero. RETURN VALUES The sbread() and sbwrite() functions return the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error. ERRORS The function sbread() may fail and set errno for any of the errors specified for the library function bread(3). Additionally, it may follow the libufs(3) error methodologies in situations where no usable superblock could be found. The function sbwrite() may fail and set errno for any of the errors specified for the library function bwrite(3). SEE ALSO bread(3), bwrite(3), libufs(3) HISTORY These functions first appeared as part of libufs(3) in FreeBSD 5.0. AUTHORS Juli Mallett <jmallett@FreeBSD.org> BSD June 4, 2003 BSD