/* vi: set sw=4 ts=4: */ /* * readahead implementation for busybox * * Preloads the given files in RAM, to reduce access time. * Does this by calling the readahead(2) system call. * * Copyright (C) 2006 Michael Opdenacker <michael@free-electrons.com> * * Licensed under GPLv2 or later, see file LICENSE in this source tree. */ #include "libbb.h" int readahead_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int readahead_main(int argc UNUSED_PARAM, char **argv) { int retval = EXIT_SUCCESS; if (!argv[1]) { bb_show_usage(); } while (*++argv) { int fd = open_or_warn(*argv, O_RDONLY); if (fd >= 0) { off_t len; int r; /* fdlength was reported to be unreliable - use seek */ len = xlseek(fd, 0, SEEK_END); xlseek(fd, 0, SEEK_SET); r = readahead(fd, 0, len); close(fd); if (r >= 0) continue; } retval = EXIT_FAILURE; } return retval; }