diff options
Diffstat (limited to 'contrib/syslinux/syslinux-4.03/libinstaller/advio.c')
-rw-r--r-- | contrib/syslinux/syslinux-4.03/libinstaller/advio.c | 162 |
1 files changed, 0 insertions, 162 deletions
diff --git a/contrib/syslinux/syslinux-4.03/libinstaller/advio.c b/contrib/syslinux/syslinux-4.03/libinstaller/advio.c deleted file mode 100644 index 56f607d..0000000 --- a/contrib/syslinux/syslinux-4.03/libinstaller/advio.c +++ /dev/null @@ -1,162 +0,0 @@ -/* ----------------------------------------------------------------------- * - * - * Copyright 2007-2008 H. Peter Anvin - All Rights Reserved - * Copyright 2010 Intel Corporation; author: H. Peter Anvin - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation, Inc., 53 Temple Place Ste 330, - * Boston MA 02111-1307, USA; either version 2 of the License, or - * (at your option) any later version; incorporated herein by reference. - * - * ----------------------------------------------------------------------- */ - -/* - * advio.c - * - * Linux ADV I/O - * - * Return 0 on success, -1 on error, and set errno. - * - */ -#define _GNU_SOURCE - -#include <stdio.h> -#include <stdlib.h> -#include <stddef.h> -#include <stdint.h> -#include <string.h> -#include <unistd.h> -#include <errno.h> -#include <fcntl.h> -#include <sys/stat.h> -#include <sys/types.h> -#include "syslxint.h" -#include "syslxcom.h" - -/* - * Read the ADV from an existing instance, or initialize if invalid. - * Returns -1 on fatal errors, 0 if ADV is okay, 1 if the ADV is - * invalid, and 2 if the file does not exist. - */ -int read_adv(const char *path, const char *cfg) -{ - char *file; - int fd = -1; - struct stat st; - int err = 0; - int rv; - - rv = asprintf(&file, "%s%s%s", path, - path[0] && path[strlen(path) - 1] == '/' ? "" : "/", cfg); - - if (rv < 0 || !file) { - perror(program); - return -1; - } - - fd = open(file, O_RDONLY); - if (fd < 0) { - if (errno != ENOENT) { - err = -1; - } else { - syslinux_reset_adv(syslinux_adv); - err = 2; /* Nonexistence is not a fatal error */ - } - } else if (fstat(fd, &st)) { - err = -1; - } else if (st.st_size < 2 * ADV_SIZE) { - /* Too small to be useful */ - syslinux_reset_adv(syslinux_adv); - err = 0; /* Nothing to read... */ - } else if (xpread(fd, syslinux_adv, 2 * ADV_SIZE, - st.st_size - 2 * ADV_SIZE) != 2 * ADV_SIZE) { - err = -1; - } else { - /* We got it... maybe? */ - err = syslinux_validate_adv(syslinux_adv) ? 1 : 0; - } - - if (err < 0) - perror(file); - - if (fd >= 0) - close(fd); - - free(file); - - return err; -} - -/* - * Update the ADV in an existing installation. - */ -int write_adv(const char *path, const char *cfg) -{ - unsigned char advtmp[2 * ADV_SIZE]; - char *file; - int fd = -1; - struct stat st, xst; - int err = 0; - int rv; - - rv = asprintf(&file, "%s%s%s", path, - path[0] && path[strlen(path) - 1] == '/' ? "" : "/", cfg); - - if (rv < 0 || !file) { - perror(program); - return -1; - } - - fd = open(file, O_RDONLY); - if (fd < 0) { - err = -1; - } else if (fstat(fd, &st)) { - err = -1; - } else if (st.st_size < 2 * ADV_SIZE) { - /* Too small to be useful */ - err = -2; - } else if (xpread(fd, advtmp, 2 * ADV_SIZE, - st.st_size - 2 * ADV_SIZE) != 2 * ADV_SIZE) { - err = -1; - } else { - /* We got it... maybe? */ - err = syslinux_validate_adv(advtmp) ? -2 : 0; - if (!err) { - /* Got a good one, write our own ADV here */ - clear_attributes(fd); - - /* Need to re-open read-write */ - close(fd); - fd = open(file, O_RDWR | O_SYNC); - if (fd < 0) { - err = -1; - } else if (fstat(fd, &xst) || xst.st_ino != st.st_ino || - xst.st_dev != st.st_dev || xst.st_size != st.st_size) { - fprintf(stderr, "%s: race condition on write\n", file); - err = -2; - } - /* Write our own version ... */ - if (xpwrite(fd, syslinux_adv, 2 * ADV_SIZE, - st.st_size - 2 * ADV_SIZE) != 2 * ADV_SIZE) { - err = -1; - } - - sync(); - set_attributes(fd); - } - } - - if (err == -2) - fprintf(stderr, "%s: cannot write auxilliary data (need --update)?\n", - file); - else if (err == -1) - perror(file); - - if (fd >= 0) - close(fd); - if (file) - free(file); - - return err; -} |