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8 .TH WRITE 9E "Mar 28, 1997"
10 write \- write data to a device
14 #include <sys/types.h>
15 #include <sys/errno.h>
19 #include <sys/sunddi.h>
23 \fBint prefix\fR\fBwrite\fR(\fBdev_t\fR \fIdev\fR, \fBstruct uio *\fR\fIuio_p\fR, \fBcred_t *\fR\fIcred_p\fR);
29 Architecture independent level 1 (DDI/DKI). This entry point is optional.
46 Pointer to the \fBuio\fR(9S) structure that describes where the data is to be
56 Pointer to the user credential structure for the \fBI/O \fRtransaction.
62 Used for character or raw data \fBI/O, \fRthe driver \fBwrite()\fR routine is
63 called indirectly through \fBcb_ops\fR(9S) by the \fBwrite\fR(2) system call.
64 The \fBwrite()\fR routine supervises the data transfer from user space to a
65 device described by the \fBuio\fR(9S) structure.
68 The \fBwrite()\fR routine should check the validity of the minor number
69 component of \fIdev\fR and the user credentials pointed to by \fIcred_p\fR, if
74 The \fBwrite()\fR routine should return \fB0\fR for success, or the
75 appropriate error number.
79 The following is an example of a \fBwrite()\fR routine using \fBphysio\fR(9F)
80 to perform writes to a seekable device:
85 xxwrite(dev_t dev, struct uio *uiop, cred_t *credp)
90 instance = getminor(dev);
91 xx = ddi_get_soft_state(xxstate, instance);
94 return (physio(xxstrategy, NULL, dev, B_WRITE,
103 \fBread\fR(2), \fBwrite\fR(2), \fBread\fR(9E), \fBphysio\fR(9F),
104 \fBcb_ops\fR(9S), \fBuio\fR(9S)
107 \fIWriting Device Drivers\fR