Performs a write operation on an open file with arguments passed in iovec elements.
#include <sys/types.h> #include <sys/errno.h> int fp_writev (fp, iov, iovcnt, ext, seg, countp) struct file * fp; struct iovec * iov; ssize_t iovcnt; ext_t ext; int seg; ssize_t * countp;
| Item | Description |
|---|---|
| fp | Points to a file structure returned by the fp_open kernel service. |
| iov | Points to an array of iovec elements. Each iovec element describes a buffer containing data to be written to the file. |
| iovcnt | Specifies the number of iovec elements in an array pointed to by the iov parameter. |
| ext | Specifies an extension argument required by some device drivers. Its content, form, and use are determined by the individual driver. |
| segflag | Indicates which part of memory the information designated
by the iov parameter is located in:
|
| countp | Points to the location where the count of bytes actually written to the file is to be returned. |
The fp_writev kernel service is an internal interface to the function provided by the writev subroutine.
The fp_writev kernel service can be called from the process environment only.
| Item | Description |
|---|---|
| 0 | Indicates a successful operation. |
If an error occurs, one of the values from the /usr/include/sys/errno.h file is returned.