Read a character from a stream
Synopsis:
#include <wchar.h>
wint_t getwchar( void );
Library:
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
Description:
The getwchar() function reads the next wide character from stdin.
Returns:
The next character from stdin, cast as
(wint_t)(wchar_t), or WEOF if the end-of-file
has been reached or if an error occurs
(errno
is set).
Note:
Use
feof()
or
ferror()
to distinguish an end-of-file condition from an error.
Errors:
- EAGAIN
- The O_NONBLOCK flag is set for stdin and would have been blocked by
this operation.
- EINTR
- A signal terminated the read operation; no data was transferred.
- EIO
- Either a physical I/O error has occurred, or the process is in the background and is being ignored or blocked.
- EOVERFLOW
- Cannot read at or beyond the offset maximum for this stream.
Classification:
ANSI,
POSIX 1003.1
Safety: |
|
Cancellation point |
Yes |
Interrupt handler |
No |
Signal handler |
No |
Thread |
Yes |