BIOWAIT(9F)BIOWAIT(9F)NAME
biowait - suspend processes pending completion of block I/O
SYNOPSIS
#include <sys/types.h>
#include <sys/buf.h>
int biowait(struct buf *bp);
INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI).
PARAMETERS
bp
Pointer to the buf structure describing the transfer.
DESCRIPTION
Drivers allocating their own buf structures with getrbuf(9F) can use
the biowait() function to suspend the current thread and wait for com‐
pletion of the transfer.
Drivers must call biodone(9F) when the transfer is complete to notify
the thread blocked by biowait(). biodone() is usually called in the
interrupt routine.
RETURN VALUES
0
Upon success
non-zero
Upon I/O failure. biowait() calls geterror(9F) to retrieve
the error number which it returns.
CONTEXTbiowait() can be called from user context only.
SEE ALSObiodone(9F), geterror(9F), getrbuf(9F), buf(9S)
Writing Device Drivers
Apr 11, 1991 BIOWAIT(9F)