Interrupted Primitives (The GNU C Library)
WebThe GNU C Library provides a convenient way to retry a call after a temporary failure, with the macro TEMP_FAILURE_RETRY : Macro: TEMP_FAILURE_RETRY (expression) ¶. This macro evaluates expression once, and examines its value as type long int. If the value equals -1, that indicates a failure and errno should be set to show what kind of failure.
Linuxにおける非同期IOの実装について #Linux - Qiita
WebDec 7, 2020 · ここで同期であるとはデータがユーザーバッファに読み込まれる (or ユーザーバッファから書き出される)まで処理を行う関数が復帰しないという意味です。 Linuxで同期IOを行うシステムコールとしては他にpread64 (2)/pwrite64 (2)/preadv (2)/pwritev (2)/preadv2 (2)/pwritev2 (2)があります 1 。 "p"がつくとIO開始オフセットが指定でき …
c - TEMP_FAILURE_RETRY and __USE_GNU - Stack Overflow
WebJul 8, 2016 · 2 Answers. Sorted by: 8. __USE_GNU is an internal macro, so you shouldn't define it yourself. But you may define _GNU_SOURCE, either in your code, or when compiling (using the -D option). I think defining this one will help to make TEMP_FAILURE_RETRY available. answered Nov 28, 2011 at 21:29. Macmade. 53.3k …
宏: TEMP_FAILURE_RETRY(expression)-CSDN博客
Web(1) 读写一个设备时，当缓存满时，需要阻塞等待资源，或者其他原因需要阻塞．. (2) 访问一些互斥资源时，当前条件不满足时. (3) waitpid, accept（阻塞）,ioctl等等，只要引起阻塞的系统调用，那么就可以称为慢系统调用．. 4．而上面的这个表达式就是为了解决EINTR返回而设计的，但也有其局限性，有些调用不能. 简单的重新调用来避免这个问题．. 比 …
I/O Primitives (The GNU C Library)
Webnbytes = TEMP_FAILURE_RETRY (write (desc, buffer, count)); Please note that there is no function named write64 . This is not necessary since this function does not directly modify or handle the possibly wide file offset.
Generic temporary retry macro/func in C (TEMP_FAILURE ...
WebAug 30, 2018 · I'm looking to implement a generic temporary retry mechanism (retries only a set number of times) in C. I'm looking for similar functionality to the GNU TEMP_FAILURE_RETRY macro. What I have so far: ({ \. int _attemptc_ = TEMP_RETRY_COUNT; \. bool _resultb_; \.
How to handle EINTR (interrupted System Call) - Stack Overflow
WebNov 6, 2009 · If a signal occurs during a blocking operation, then the operation will either (a) return partial completion, or (b) return failure, do nothing, and set errno to EINTR. So, for an all-or-fail write operation which retries after interruptions, you'd do something like this:
Is it safe to restart system calls? - Unix & Linux Stack Exchange
WebOct 2, 2020 · 1 Answer. Sorted by: 3. On Linux, yes, it is always safe to restart a system call which returned with EINTR: that return value means that the system call was interrupted before it made any useful progress, and should be restarted. The system call’s implementation takes this into account.
libcutils/include/cutils/fs.h - platform/system/core - Git at Google
WebSo, if it's. * not already defined, then define it here. */. #ifndef TEMP_FAILURE_RETRY. /* Used to retry syscalls that can return EINTR. */. #define TEMP_FAILURE_RETRY(exp) ( { \. typeof (exp) _rc; \. do { \.
C++ (Cpp) TEMP_FAILURE_RETRY Examples - HotExamples
WebC++ (Cpp) TEMP_FAILURE_RETRY - 30 examples found. These are the top rated real world C++ (Cpp) examples of TEMP_FAILURE_RETRY extracted from open source projects. You can rate examples to help us improve the quality of examples. Example #1. 0. Show file. File: lttd.c Project: Claruarius/stblinux-2.6.37. int read_subbuffer(struct fd_pair …
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