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am d49247be: am ffe02668: Merge "bionic: fix __set_errno for arm64 syscalls that return a 64-bit value"

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* commit 'd49247be279b337fdd72c15421dcaf318489d284':
  bionic: fix __set_errno for arm64 syscalls that return a 64-bit value
This commit is contained in:
Elliott Hughes
2014-02-18 20:42:57 +00:00
committed by Android Git Automerger
parent 662655428d d49247be27
commit a1ac8a60da
2 changed files with 36 additions and 2 deletions
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15
libc/bionic/__set_errno.cpp
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@@ -31,8 +31,19 @@
// This function is called from our assembler syscall stubs.
// C/C++ code should just assign 'errno' instead.
// TODO: this should be __LIBC_HIDDEN__ but was exposed in <errno.h> in the NDK.
extern "C" int __set_errno(int n) {
// The return type is 'long' because we use the same routine in calls
// that return an int as in ones that return a ssize_t. On a 32-bit
// system these are the same size, but on a 64-bit system they're not.
// 'long' gives us 32-bit on 32-bit systems, 64-bit on 64-bit systems.
#if __LP64__
extern "C" __LIBC_HIDDEN__ long __set_errno(int);
#else
// __set_errno was mistakenly exposed in <errno.h> in the 32-bit NDK.
extern "C" long __set_errno(int);
#endif
long __set_errno(int n) {
errno = n;
return -1;
}