rdchk()
QNX SDP8.0C Library ReferenceAPIDeveloper
Check to see if a read is likely to succeed
Synopsis:
#include <unix.h>
int rdchk( int fd );
Arguments:
- fd
- The file descriptor that you want to check.
Library:
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
Description:
The rdchk() function checks to see if a read from the file descriptor, fd, is likely to succeed.
Returns:
The number of characters waiting to be read, or -1 if an error occurred (errno is set).
Errors:
- ENOTTY
- The resource manager serving fd does not support this call.
Classification:
| Safety: | |
|---|---|
| Cancellation point | No |
| Signal handler | Yes |
| Thread | Yes |
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