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mdbx: fix pwrite() for WRITE_MAX.

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Change-Id: If4924d20c1e267c2d3a190c860b89fc2fda0d517
This commit is contained in:
Leonid Yuriev 2019-06-24 00:56:26 +03:00
parent f627b33379
commit 5b88fe819c
1 changed files with 15 additions and 7 deletions
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22
src/osal.c
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@ -583,17 +583,25 @@ int mdbx_pwrite(mdbx_filehandle_t fd, const void *buf, size_t bytes,
return (bytes == written) ? MDBX_SUCCESS : MDBX_EIO /* ERROR_WRITE_FAULT */;
return GetLastError();
#else
int rc;
intptr_t written;
do {
while (true) {
STATIC_ASSERT_MSG(sizeof(off_t) >= sizeof(size_t),
"libmdbx requires 64-bit file I/O on 64-bit systems");
written = pwrite(fd, buf, bytes, offset);
const intptr_t written =
pwrite(fd, buf, (bytes <= MAX_WRITE) ? bytes : MAX_WRITE, offset);
if (likely(bytes == (size_t)written))
return MDBX_SUCCESS;
rc = errno;
} while (rc == EINTR);
return (written < 0) ? rc : MDBX_EIO /* Use which error code (ENOSPC)? */;
if (written < 0) {
const int rc = errno;
if (rc != EINTR)
return rc;
} else if (written > 0) {
bytes -= written;
offset += written;
buf = (char *)buf + written;
} else {
return -1;
}
}
#endif
}