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libc_noux: fix 'read()' function 

This patch fixes the problem that data in the read buffer would get
overwritten in cases where multiple 'read()' syscalls are necessary.

Fixes #303.
This commit is contained in:
Christian Prochaska 2012-07-27 17:20:33 +02:00 committed by Norman Feske
parent d6d45f870e
commit fa541b4545
1 changed files with 5 additions and 3 deletions
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8
ports/src/lib/libc_noux/plugin.cc
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@ -664,7 +664,7 @@ namespace {
{
Genode::size_t sum_read_count = 0;
while (count) {
while (count > 0) {
Genode::size_t curr_count =
Genode::min(count, sizeof(sysio()->read_out.chunk));
@ -678,11 +678,13 @@ namespace {
return -1;
}
Genode::memcpy(buf, sysio()->read_out.chunk, sysio()->read_out.count);
Genode::memcpy((char*)buf + sum_read_count,
sysio()->read_out.chunk,
sysio()->read_out.count);
sum_read_count += sysio()->read_out.count;
if (sysio()->read_out.count < sysio()->read_in.count)
if (sysio()->read_out.count < curr_count)
break; /* end of file */
if (sysio()->read_out.count <= count)