DIRREAD(3) DIRREAD(3) NAME dirread, dirreadall - read directory SYNOPSIS #include <u.h> #include <libc.h> long dirread(int fd, Dir **buf) long dirreadall(int fd, Dir **buf) #define STATMAX 65535U #define DIRMAX (sizeof(Dir)+STATMAX) DESCRIPTION The data returned by a read(3) on a directory is a set of complete directory entries in a machine-independent format, exactly equivalent to the result of a stat(3) on each file or subdirectory in the directory. Dirread decodes the directory entries into a machine-dependent form. It reads from fd and unpacks the data into an array of Dir structures whose address is returned in *buf (see stat(3) for the lay- out of a Dir). The array is allocated with malloc(3) each time dirread is called. Dirreadall is like dirread, but reads in the entire direc- tory; by contrast, dirread steps through a directory one read(3) at a time. Directory entries have variable length. A successful read of a directory always returns an integral number of complete directory entries; dirread always returns complete Dir structures. See read(9p) for more information. The constant STATMAX is the maximum size that a directory entry can occupy. The constant DIRMAX is an upper limit on the size necessary to hold a Dir structure and all the asso- ciated data. Dirread and dirreadall return the number of Dir structures filled in buf. The file offset is advanced by the number of bytes actually read. SOURCE /src/lib9/dirread.c SEE ALSO intro(3), open(3), read(3) DIRREAD(3) DIRREAD(3) DIAGNOSTICS Dirread and Dirreadall return zero for end of file and a negative value for error. In either case, *buf is set to nil so the pointer can always be freed with impunity. These functions set errstr.