| /* |
| * Copyright (c) 2019 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "pas_config.h" |
| |
| #if LIBPAS_ENABLED |
| |
| #include "pas_log.h" |
| |
| #include <errno.h> |
| #include "pas_snprintf.h" |
| #include <unistd.h> |
| |
| #pragma clang diagnostic push |
| #pragma clang diagnostic ignored "-Wformat-nonliteral" |
| |
| pthread_t pas_thread_that_is_crash_logging; |
| |
| void pas_vlog_fd(int fd, const char* format, va_list list) |
| { |
| char buf[PAS_LOG_MAX_BYTES]; |
| ssize_t result; |
| char* ptr; |
| size_t bytes_left_to_write; |
| pthread_t thread_that_is_crash_logging; |
| |
| thread_that_is_crash_logging = pas_thread_that_is_crash_logging; |
| while (thread_that_is_crash_logging && thread_that_is_crash_logging != pthread_self()) { |
| pas_compiler_fence(); |
| thread_that_is_crash_logging = pas_thread_that_is_crash_logging; |
| } |
| |
| result = pas_vsnprintf(buf, PAS_LOG_MAX_BYTES, format, list); |
| |
| PAS_ASSERT(result >= 0); |
| |
| if ((size_t)result < PAS_LOG_MAX_BYTES) |
| bytes_left_to_write = (size_t)result; |
| else |
| bytes_left_to_write = PAS_LOG_MAX_BYTES - 1; |
| |
| ptr = buf; |
| |
| while (bytes_left_to_write) { |
| result = write(fd, ptr, bytes_left_to_write); |
| if (result < 0) { |
| PAS_ASSERT(errno == EINTR); |
| continue; |
| } |
| |
| PAS_ASSERT(result); |
| |
| ptr += result; |
| bytes_left_to_write -= (size_t)result; |
| } |
| } |
| |
| void pas_log_fd(int fd, const char* format, ...) |
| { |
| va_list arg_list; |
| va_start(arg_list, format); |
| pas_vlog_fd(fd, format, arg_list); |
| va_end(arg_list); |
| } |
| |
| void pas_vlog(const char* format, va_list list) |
| { |
| pas_vlog_fd(PAS_LOG_DEFAULT_FD, format, list); |
| } |
| |
| void pas_log(const char* format, ...) |
| { |
| va_list arg_list; |
| va_start(arg_list, format); |
| pas_vlog(format, arg_list); |
| va_end(arg_list); |
| } |
| |
| void pas_start_crash_logging(void) |
| { |
| pas_thread_that_is_crash_logging = pthread_self(); |
| pas_fence(); |
| } |
| |
| #endif /* LIBPAS_ENABLED */ |