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8274548: (fc) FileChannel gathering write fails with IOException "Invalid argument" on macOS 11.6

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Reviewed-by: alanb
This commit is contained in:
Brian Burkhalter 2021-10-12 15:25:53 +00:00
parent f623460668
commit 07b1f1c282
4 changed files with 172 additions and 4 deletions
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26
src/java.base/unix/native/libnio/ch/IOUtil.c
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2000, 2021, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -33,6 +33,7 @@
#include "jlong.h"
#include "sun_nio_ch_IOUtil.h"
#include "java_lang_Integer.h"
#include "java_lang_Long.h"
#include "nio.h"
#include "nio_util.h"
@ -173,6 +174,29 @@ Java_sun_nio_ch_IOUtil_iovMax(JNIEnv *env, jclass this)
return (jint)iov_max;
}
JNIEXPORT jlong JNICALL
Java_sun_nio_ch_IOUtil_writevMax(JNIEnv *env, jclass this)
{
#if defined(MACOSX) || defined(__linux__)
//
// The man pages of writev() on both Linux and macOS specify this
// constraint on the sum of all byte lengths in the iovec array:
//
// [EINVAL] The sum of the iov_len values in the iov array
// overflows a 32-bit integer.
//
// As of macOS 11 Big Sur, Darwin version 20, writev() started to
// actually enforce the constraint which had been previously ignored.
//
// In practice on Linux writev() has been observed not to write more
// than 0x7fff0000 (aarch64) or 0x7ffff000 (x64) bytes in one call.
//
return java_lang_Integer_MAX_VALUE;
#else
return java_lang_Long_MAX_VALUE;
#endif
}
/* Declared in nio_util.h for use elsewhere in NIO */
jint