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compate/clipped-write.c: large write(2) fails on Mac OS X/XNU

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Due to a bug in the Darwin kernel, write(2) calls have a maximum size
of INT_MAX bytes.

Introduce a new compat function, clipped_write(), that only writes
at most INT_MAX bytes and returns the number of bytes written, as
a substitute for write(2), and allow platforms that need this to
enable it from the build mechanism with NEEDS_CLIPPED_WRITE.

Set it for Mac OS X by default.  It may be necessary to include this
function on Windows, too.

Signed-off-by: Filipe Cabecinhas <filcab+git@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Filipe Cabecinhas
2013-05-10 15:24:57 -07:00
committed by Junio C Hamano
parent 239222f587
commit 6c642a8786
4 changed files with 27 additions and 0 deletions
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5
git-compat-util.h
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@ -181,6 +181,11 @@ typedef unsigned long uintptr_t;
#define probe_utf8_pathname_composition(a,b)
#endif
#ifdef NEEDS_CLIPPED_WRITE
ssize_t clipped_write(int fildes, const void *buf, size_t nbyte);
#define write(x,y,z) clipped_write((x),(y),(z))
#endif
#ifdef MKDIR_WO_TRAILING_SLASH
#define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);