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Merge pilot.blaudden:/home/msvensson/mysql/bug26837/my50-bug26837

Browse source 
into  pilot.blaudden:/home/msvensson/mysql/mysql-5.0-maint
This commit is contained in:
msvensson@pilot.blaudden 2007-03-29 12:34:44 +02:00
commit 0e2de06a2a
1 changed files with 21 additions and 6 deletions
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27
sql/log_event.cc
View file

@ -669,19 +669,34 @@ int Log_event::read_log_event(IO_CACHE* file, String* packet,
LOG_READ_TOO_LARGE);
goto end;
}
packet->append(buf, sizeof(buf));
/* Append the log event header to packet */
if (packet->append(buf, sizeof(buf)))
{
/* Failed to allocate packet */
result= LOG_READ_MEM;
goto end;
}
data_len-= LOG_EVENT_MINIMAL_HEADER_LEN;
if (data_len)
{
/* Append rest of event, read directly from file into packet */
if (packet->append(file, data_len))
{
/*
Here if we hit EOF it's really an error: as data_len is >=0
there's supposed to be more bytes available.
EOF means we are reading the event partially, which should
never happen: either we read badly or the binlog is truncated.
Fatal error occured when appending rest of the event
to packet, possible failures:
1. EOF occured when reading from file, it's really an error
as data_len is >=0 there's supposed to be more bytes available.
file->error will have been set to number of bytes left to read
2. Read was interrupted, file->error would normally be set to -1
3. Failed to allocate memory for packet, my_errno
will be ENOMEM(file->error shuold be 0, but since the
memory allocation occurs before the call to read it might
be uninitialized)
*/
result= file->error >= 0 ? LOG_READ_TRUNC: LOG_READ_IO;
result= (my_errno == ENOMEM ? LOG_READ_MEM :
(file->error >= 0 ? LOG_READ_TRUNC: LOG_READ_IO));
/* Implicit goto end; */
}
}