Query: cgread
OS: freebsd
Section: 3
Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar
CGREAD(3) BSD Library Functions Manual CGREAD(3)NAMEcgread, cgread1, cgwrite1 -- read/write cylinder groups of UFS disksLIBRARYUFS 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 cgread(struct uufsd *disk); int cgread1(struct uufsd *disk, int c); int cgwrite1(struct uufsd *disk, int c);DESCRIPTIONThe cgread() and cgread1() functions provide cylinder group reads for libufs(3) consumers. The cgread1() function reads from one cylinder group, specified by c into the d_cg field of a userland UFS disk structure. It sets the d_lcg field to the cylinder group number c. The cgread() function operates on sequential cylinder groups. Calling the cgread() function is equivalent to calling cgread1() with a cylin- der group specifier equivalent to the value of the current d_ccg field, and then incrementing the d_ccg field. The cgwrite1() function stores cylinder group specified by c from d_cg field of a userland UFS disk structure on disk.RETURN VALUESBoth functions return 0 if there are no more cylinder groups to read, 1 if there are more cylinder groups, and -1 on error.ERRORSThe function cgread() may fail and set errno for any of the errors specified for the library function bread(3). The function cgread1() has semantically identical failure conditions to those of cgread(). The function cgwrite1() may fail and set errno for any of the errors specified for the library function bwrite(3).SEE ALSObread(3), bwrite(3), libufs(3)HISTORYThese functions first appeared as part of libufs(3) in FreeBSD 5.1.AUTHORSJuli Mallett <jmallett@FreeBSD.org>BSDJune 4, 2003 BSD
Related Man Pages |
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cgwrite1(3) - freebsd |
bread(3) - freebsd |
berase(3) - freebsd |
ufs_disk_fillout_blank(3) - freebsd |
ufs_disk_write(3) - freebsd |
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