Default handler for _IO_READ messages
#include <sys/iofunc.h> int iofunc_read_default( resmgr_context_t *ctp, io_read_t *msg, iofunc_ocb_t *ocb );
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
The iofunc_read_default() function implements POSIX semantics for the client's read() call, which is received as an _IO_READ message by the resource manager.
You can place this function directly into the resmgr_io_funcs_t table passed as the io_funcs argument to resmgr_attach(), at the read position, or you can call iofunc_func_init() to initialize all of the functions to their default values.
The iofunc_read_default() function calls iofunc_read_verify() to check the permissions on the file. If the permissions are appropriate, iofunc_read_default() indicates that it read zero bytes.
Safety: | |
---|---|
Cancellation point | No |
Interrupt handler | No |
Signal handler | Yes |
Thread | Yes |