a061d97027
This allows quick changes to the formatted output of a profile. Sponsored by: Smule, Inc.
75 lines
1.8 KiB
Bash
75 lines
1.8 KiB
Bash
# -*- tab-width: 4 -*- ;; Emacs
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# vi: set filetype=sh tabstop=8 shiftwidth=8 noexpandtab :: Vi/ViM
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############################################################ IDENT(1)
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#
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# $Title: dwatch(8) module for read(2), write(2), or similar entry $
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# $Copyright: 2014-2018 Devin Teske. All rights reserved. $
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# $FreeBSD$
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#
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############################################################ DESCRIPTION
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#
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# Display data sent/received when read(2)/write(2) occurs
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#
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############################################################ PROBE
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case "$PROFILE" in
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rw) : ${PROBE:=syscall::read:entry, syscall::write:entry} ;;
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*) : ${PROBE:=syscall::$PROFILE:entry}
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esac
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############################################################ ACTIONS
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exec 9<<EOF
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this size_t nbytes;
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this string bufstr;
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this string flow;
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this void * buf;
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this void * data;
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$PROBE /* probe ID $ID */
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{${TRACE:+
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printf("<$ID>");
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}
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/*
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* R/W
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*/
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this->flow = probefunc == "read" ? "<-" : "->";
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this->buf = (void *)arg1;
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this->nbytes = (size_t)arg2;
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/*
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* Allocate temporary memory for, copy, and NUL-terminate the data
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*/
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this->data = alloca(this->nbytes + 1);
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copyinto((uintptr_t)this->buf, this->nbytes, this->data);
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bcopy("\0", (void *)((uintptr_t)this->data + this->nbytes), 1);
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/*
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* Extract string from temporary memory
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*/
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this->bufstr = stringof(this->data);
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}
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EOF
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ACTIONS=$( cat <&9 )
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ID=$(( $ID + 1 ))
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############################################################ EVENT DETAILS
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if [ ! "$CUSTOM_DETAILS" ]; then
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exec 9<<EOF
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/*
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* Print read/write details
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*/
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printf("%s \"%s\" %d byte%s",
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this->flow,
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this->bufstr,
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this->nbytes,
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this->nbytes == 1 ? "" : "s");
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EOF
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EVENT_DETAILS=$( cat <&9 )
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fi
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################################################################################
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# END
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################################################################################
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