ali@403: /*
ali@475:  * Copyright (C) 2011-2012, 2016  J. Ali Harlow <ali@juiblex.co.uk>
ali@403:  *
ali@403:  * This program is free software; you can redistribute it and/or modify
ali@403:  * it under the terms of the GNU General Public License as published by
ali@403:  * the Free Software Foundation; either version 2 of the License, or
ali@403:  * (at your option) any later version.
ali@403:  *
ali@403:  * This program is distributed in the hope that it will be useful,
ali@403:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
ali@403:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
ali@403:  * GNU General Public License for more details.
ali@403:  *
ali@403:  * You should have received a copy of the GNU General Public License along
ali@403:  * with this program; if not, write to the Free Software Foundation, Inc.,
ali@403:  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
ali@403:  */
ali@403: 
ali@403: #include "config.h"
ali@403: 
ali@403: #include <stdlib.h>
ali@403: #include <stdio.h>
ali@403: #include <limits.h>
ali@403: #include <errno.h>
ali@403: #include <unistd.h>
ali@403: #include <string.h>
ali@403: #include <assert.h>
ali@403: 
ali@403: #include "razor.h"
ali@403: #include "razor-internal.h"
ali@403: 
ali@403: /*
ali@403:  * Atomic transactions
ali@403:  */
ali@403: 
ali@403: static int allow_all_root_names = 0;
ali@403: 
ali@403: /*
ali@403:  * Primarily intended for testing named roots under UNIX platforms.
ali@403:  */
ali@403: RAZOR_EXPORT void
ali@403: razor_disable_root_name_checks(int disable)
ali@403: {
ali@403: 	allow_all_root_names = disable;
ali@403: }
ali@403: 
ali@416: int
ali@416: razor_allow_all_root_names(void)
ali@403: {
ali@416: 	return allow_all_root_names;
ali@403: }
ali@403: 
ali@439: RAZOR_EXPORT struct razor_error *
ali@439: razor_atomic_get_error(struct razor_atomic *atomic)
ali@439: {
ali@439: 	return atomic->error;
ali@439: }
ali@439: 
ali@403: RAZOR_EXPORT const char *
ali@403: razor_atomic_get_error_msg(struct razor_atomic *atomic)
ali@403: {
ali@423: 	if (atomic->error)
ali@423: 		return razor_error_get_msg(atomic->error);
ali@423: 	else
ali@423: 		return NULL;
ali@403: }
ali@403: 
ali@403: RAZOR_EXPORT void
ali@447: razor_atomic_abort(struct razor_atomic *atomic, int domain, int code,
ali@447: 		   const char *error_msg)
ali@403: {
ali@423: 	if (!atomic->error)
ali@447: 		atomic->error = razor_error_new_str(domain, code, NULL,
ali@447: 						    error_msg);
ali@447: }
ali@447: 
ali@447: RAZOR_EXPORT void
ali@447: razor_atomic_propagate_error(struct razor_atomic *atomic,
ali@447: 			     struct razor_error *error, const char *summary)
ali@447: {
ali@475: 	if (!atomic->error) {
ali@475: 		if (!summary) {
ali@475: 			atomic->error = error;
ali@475: 			return;
ali@475: 		} else
ali@475: 			atomic->error = razor_error_dup(error, summary);
ali@475: 	}
ali@475: 
ali@475: 	razor_error_free(error);
ali@403: }
ali@403: 
ali@403: RAZOR_EXPORT int
ali@403: razor_atomic_in_error_state(struct razor_atomic *atomic)
ali@403: {
ali@423: 	return atomic->error && !atomic->in_undo;
ali@403: }
ali@416: 
ali@416: #if !HAVE_WINDOWS_KTM
ali@416: 
ali@416: /*
ali@416:  * Common code with atomic-none and atomic-emulate
ali@416:  */
ali@416: 
ali@416: #define RAZOR_ASCII_ISALPHA(c)	\
ali@416: 			((c) >= 'A' && (c) <= 'Z' || (c) >= 'a' && (c) <= 'z')
ali@416: 
ali@416: int
ali@416: razor_valid_root_name(const char *name)
ali@416: {
ali@416: 	if (razor_allow_all_root_names()) {
ali@416: #ifdef MSWIN_API
ali@416: 		return !strpbrk(name, "/\\");
ali@416: #else
ali@416: 		return !strchr(name, '/');
ali@416: #endif
ali@416: 	}
ali@416: 
ali@416: #ifdef MSWIN_API
ali@416: 	return RAZOR_ASCII_ISALPHA(name[0]) && name[1] == ':' &&
ali@416: 	       name[2] == '\0';
ali@416: #else
ali@416: 	return name[0] == '\0';
ali@416: #endif
ali@416: }
ali@416: 
ali@416: RAZOR_EXPORT int
ali@416: razor_atomic_write(struct razor_atomic *atomic, int fd, const void *data,
ali@416: 		   size_t size)
ali@416: {
ali@416: 	int written;
ali@416: 
ali@416: 	if (razor_atomic_in_error_state(atomic))
ali@416: 		return -1;
ali@416: 
ali@416: 	while(size) {
ali@416: 		written = write(fd, data, size);
ali@416: 		if (written < 0) {
ali@447: 			atomic->error = razor_error_new_posix(NULL);
ali@416: 
ali@416: 			(void)close(fd);
ali@416: 
ali@416: 			return -1;
ali@416: 		}
ali@416: 
ali@416: 		data += written;
ali@416: 		size -= written;
ali@416: 	}
ali@416: 
ali@416: 	return 0;
ali@416: }
ali@416: 
ali@416: RAZOR_EXPORT int
ali@416: razor_atomic_sync(struct razor_atomic *atomic, int handle)
ali@416: {
ali@416: 	if (razor_atomic_in_error_state(atomic))
ali@416: 		return -1;
ali@416: 
ali@416: 	if (fsync(handle) < 0) {
ali@447: 		atomic->error = razor_error_new_posix(NULL);
ali@416: 		return -1;
ali@416: 	}
ali@416: 
ali@416: 	return 0;
ali@416: }
ali@416: 
ali@416: RAZOR_EXPORT int
ali@416: razor_atomic_close(struct razor_atomic *atomic, int fd)
ali@416: {
ali@416: 	if (razor_atomic_in_error_state(atomic))
ali@416: 		return -1;
ali@416: 
ali@416: 	if (close(fd) < 0) {
ali@447: 		atomic->error = razor_error_new_posix(NULL);
ali@416: 		return -1;
ali@416: 	}
ali@416: 
ali@416: 	return 0;
ali@416: }
ali@416: 
ali@416: #endif	/* !HAVE_WINDOWS_KTM */