TEMP_FAILURE_RETRY

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https://stackoverflow.com/questions/8302547/temp-failure-retry-and-use-gnu
TEMP_FAILURE_RETRY and __USE_GNU
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8answered Nov 28, 2011 at 21:29
__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.
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Interrupted Primitives (The GNU C Library)
ウェブThe 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) …
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How to retry a call after a temporary failure?
The GNU C Library provides a convenient way to retry a call after a temporary failure, with the macro TEMP_FAILURE_RETRY : 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.
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What does temp_failure_retry do?
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. If it fails and reports error code EINTR , TEMP_FAILURE_RETRY evaluates it again, and over and over until the result is not a temporary failure.
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How to retry a POSIX call after a temporary failure?
Typically, POSIX applications that use signal handlers must check for EINTR after each library function that can return it, in order to try the call again. Often programmers forget to check, which is a common source of error. The GNU C Library provides a convenient way to retry a call after a temporary failure, with the macro TEMP_FAILURE_RETRY :
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https://stackoverflow.com/questions/8302547

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