.IX \f4msgdsize\fP(D3DK)
.IX STREAMS messages

NAME

msgdsize − return number of bytes of data in a message

SYNOPSIS

#include <sys/stream.h>
int msgdsize(mblk_t ∗mp);

ARGUMENTS

mpPointer to the message to be evaluated. 

DESCRIPTION

msgdsize counts the number of bytes of data in the message pointed to by mp.  Only bytes included in message blocks of type M_DATA are included in the count. 

RETURN VALUE

The number of bytes of data in the message. 

LEVEL

Base or Interrupt. 

NOTES

Does not sleep. 

Driver-defined basic locks, read/write locks, and sleep locks may be held across calls to this function. 

SEE ALSO

msgb(D4DK)

EXAMPLE

See insq(D3DK) for an example of msgdsize. 

DDI/DKI  —  STREAMS