Write a message to a client
Synopsis:
#include <sys/iofunc.h>
#include <sys/resmgr.h>
ssize_t resmgr_msgwritev( resmgr_context_t *ctp,
const iov_t *smsg,
int sparts,
size_t offset );
Arguments:
- ctp
- A pointer to a
resmgr_context_t
structure that the resource-manager library uses to pass context information between functions.
This function extracts the rcvid from this structure.
- smsg
- An array of buffers that contains the data you want to write.
- sparts
- The number of elements in the array.
This function doesn't let you write past the end of the sender's buffer;
it returns the number of bytes actually written.
- offset
- An offset into the sender's buffer that indicates where you want to start writing the data.
Library:
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
Description:
The resmgr_msgwritev() function is a cover function for
MsgWritev(),
and performs the exact same functionality.
It's provided for consistency with
resmgr_msgwrite().
Returns:
The number of bytes written, or -1 if an error occurred
(errno is set).
Errors:
- EFAULT
- A fault occurred in the sender's address space when a server
tried to access the sender's return message buffer.
- EOVERFLOW
- The sum of the IOV lengths exceeds SSIZE_MAX,
or the number of parts exceeds 524288.
- ESRCH
- The thread indicated by ctp->rcvid doesn't exist or has had its connection detached.
- ESRVRFAULT
- A fault occurred when the kernel tried to access the buffers provided.
Classification:
QNX Neutrino
| Safety: |
|
|---|
| Cancellation point |
No |
| Interrupt handler |
No |
| Signal handler |
Yes |
| Thread |
Yes |