Visit Our UNIX and Linux User Community

Linux and UNIX Man Pages

Test Your Knowledge in Computers #973
Difficulty: Easy
GCC is the default compiler for the Linux kernel source.
True or False?
Linux & Unix Commands - Search Man Pages

awrite(9e) [bsd man page]

awrite(9E)							Driver Entry Points							awrite(9E)

NAME
awrite - asynchronous write to a device SYNOPSIS
#include <sys/uio.h> #include <sys/aio_req.h> #include <sys/cred.h> #include <sys/ddi.h> #include <sys/sunddi.h> intprefixawrite(dev_t dev, struct aio_req *aio_reqp, cred_t *cred_p); INTERFACE LEVEL
Solaris DDI specific (Solaris DDI). This entry point is optional. Drivers that do not support an awrite() entry point should use nodev(9F) PARAMETERS
dev Device number. aio_reqp Pointer to the aio_req(9S) structure that describes where the data is stored. cred_p Pointer to the credential structure. DESCRIPTION
The driver's awrite() routine is called to perform an asynchronous write. getminor(9F) can be used to access the minor number component of the dev argument. awrite() may use the credential structure pointed to by cred_p to check for superuser access by calling drv_priv(9F). The awrite() routine may also examine the uio(9S) structure through the aio_req structure pointer, aio_reqp. awrite() must call aphysio(9F) with the aio_req pointer and a pointer to the driver's strategy(9E) routine. No fields of the uio(9S) structure pointed to by aio_req, other than uio_offset or uio_loffset, may be modified for non-seekable devices. RETURN VALUES
The awrite() routine should return 0 for success, or the appropriate error number. CONTEXT
This function is called from user context only. EXAMPLES
Example 1: Using the awrite routine: The following is an example of an awrite() routine: static int xxawrite(dev_t dev, struct aio_req *aio, cred_t *cred_p) { int instance; struct xxstate *xsp; instance = getminor(dev); xsp = ddi_get_soft_state(statep, instance); /*Verify soft state structure has been allocated */ if (xsp == NULL) return (ENXIO); return (aphysio(xxstrategy, anocancel, dev, B_WRITE, xxminphys, aio)); } SEE ALSO
write(2), aiowrite(3AIO), aread(9E), read(9E), strategy(9E), write(9E), anocancel(9F), aphysio(9F), ddi_get_soft_state(9F), drv_priv(9F), getminor(9F), minphys(9F), nodev(9F), aio_req(9S), cb_ops(9S), uio(9S) Writing Device Drivers BUGS
There is no way other than calling aphysio(9F) to accomplish an asynchronous write. SunOS 5.10 28 Mar 1997 awrite(9E)

Check Out this Related Man Page

awrite(9E)                                                      Driver Entry Points                                                     awrite(9E)

NAME
awrite - asynchronous write to a device SYNOPSIS
#include <sys/uio.h> #include <sys/aio_req.h> #include <sys/cred.h> #include <sys/ddi.h> #include <sys/sunddi.h> intprefixawrite(dev_t dev, struct aio_req *aio_reqp, cred_t *cred_p); INTERFACE LEVEL
Solaris DDI specific (Solaris DDI). This entry point is optional. Drivers that do not support an awrite() entry point should use nodev(9F) PARAMETERS
dev Device number. aio_reqp Pointer to the aio_req(9S) structure that describes where the data is stored. cred_p Pointer to the credential structure. DESCRIPTION
The driver's awrite() routine is called to perform an asynchronous write. getminor(9F) can be used to access the minor number component of the dev argument. awrite() may use the credential structure pointed to by cred_p to check for superuser access by calling drv_priv(9F). The awrite() routine may also examine the uio(9S) structure through the aio_req structure pointer, aio_reqp. awrite() must call aphysio(9F) with the aio_req pointer and a pointer to the driver's strategy(9E) routine. No fields of the uio(9S) structure pointed to by aio_req, other than uio_offset or uio_loffset, may be modified for non-seekable devices. RETURN VALUES
The awrite() routine should return 0 for success, or the appropriate error number. CONTEXT
This function is called from user context only. EXAMPLES
Example 1: Using the awrite routine: The following is an example of an awrite() routine: static int xxawrite(dev_t dev, struct aio_req *aio, cred_t *cred_p) { int instance; struct xxstate *xsp; instance = getminor(dev); xsp = ddi_get_soft_state(statep, instance); /*Verify soft state structure has been allocated */ if (xsp == NULL) return (ENXIO); return (aphysio(xxstrategy, anocancel, dev, B_WRITE, xxminphys, aio)); } SEE ALSO
write(2), aiowrite(3AIO), aread(9E), read(9E), strategy(9E), write(9E), anocancel(9F), aphysio(9F), ddi_get_soft_state(9F), drv_priv(9F), getminor(9F), minphys(9F), nodev(9F), aio_req(9S), cb_ops(9S), uio(9S) Writing Device Drivers BUGS
There is no way other than calling aphysio(9F) to accomplish an asynchronous write. SunOS 5.10 28 Mar 1997 awrite(9E)

Featured Tech Videos