SunOS man pages

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Kernel Functions for Drivers

msgdsize(9F)

NAME

msgdsize - return the number of bytes in a message

#include <sys/stream.h> size_t msgdsize(mblk_t *mp);

Architecture independent level 1 (DDI/DKI).

msgdsize() counts the number of bytes in a data message. Only bytes included in the data blocks of type M_DATA are included in the count.

The number of data bytes in a message, expressed as an integer.

msgdsize() can be called from user or interrupt context.

See bufcall(9F) for an example that uses msgdsize().