Report errors from stream read and write operations

The php_stream_read() and php_stream_write() functions now return
an ssize_t value, with negative results indicating failure. Functions
like fread() and fwrite() will return false in that case.

As a special case, EWOULDBLOCK and EAGAIN on non-blocking streams
should not be regarded as error conditions, and be reported as
successful zero-length reads/writes instead. The handling of EINTR
remains unclear and is internally inconsistent (e.g. some code-paths
will automatically retry on EINTR, while some won't).

I'm landing this now to make sure the stream wrapper ops API changes
make it into 7.4 -- however, if the user-facing changes turn out to
be problematic we have the option of clamping negative returns to
zero in php_stream_read() and php_stream_write() to restore the
old behavior in a relatively non-intrusive manner.
This commit is contained in:
Nikita Popov 2019-07-18 15:25:59 +02:00
parent c817b8020c
commit d59aac58b3
73 changed files with 648 additions and 377 deletions

View file

@ -225,8 +225,8 @@ static void php_pgsql_get_field_info(INTERNAL_FUNCTION_PARAMETERS, int entry_typ
static void php_pgsql_data_info(INTERNAL_FUNCTION_PARAMETERS, int entry_type);
static void php_pgsql_do_async(INTERNAL_FUNCTION_PARAMETERS,int entry_type);
static size_t php_pgsql_fd_write(php_stream *stream, const char *buf, size_t count);
static size_t php_pgsql_fd_read(php_stream *stream, char *buf, size_t count);
static ssize_t php_pgsql_fd_write(php_stream *stream, const char *buf, size_t count);
static ssize_t php_pgsql_fd_read(php_stream *stream, char *buf, size_t count);
static int php_pgsql_fd_close(php_stream *stream, int close_handle);
static int php_pgsql_fd_flush(php_stream *stream);
static int php_pgsql_fd_set_option(php_stream *stream, int option, int value, void *ptrparam);