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usr.sbin/dwatch/libexec/vop_symlink

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# -*- tab-width: 4 -*- ;; Emacs
# vi: set filetype=sh tabstop=8 shiftwidth=8 noexpandtab :: Vi/ViM
############################################################ IDENT(1)
#
# $Title: dwatch(8) module for VOP_SYMLINK(9) entry $
# $Copyright: 2014-2017 Devin Teske. All rights reserved. $
# $FreeBSD$
#
############################################################ DESCRIPTION
#
# Print symlink paths being created by VOP_SYMLINK(9)
# NB: All paths are shown even if error prevents their creation.
#
############################################################ PROBE
# This is optional, if you don't set or it is NULL, dwatch(8) will try to
# dynamically determine the probe via the module's filename. For example, if
# the module file is named `foo' then dwatch(8) will try `dtrace -ln foo:entry'
# to determine an appropriate probe for watching `foo'.
PROBE=vfs:vop:vop_symlink
############################################################ ACTIONS
# Optional actions to be performed before hitting the final print action
exec 9<<EOF
$PROBE:entry /* probe ID 2 */
{
this->vp = (struct vnode *)arg0;
this->ncp = this->vp != NULL ?
this->vp->v_cache_dst.tqh_first : 0;
this->target = args[1] ? args[1]->a_target : "";
this->fi_name = args[1] ? (
args[1]->a_cnp != NULL ?
stringof(args[1]->a_cnp->cn_nameptr) : ""
) : "";
this->mount = this->vp != NULL ?
this->vp->v_mount : NULL; /* ptr to vfs we are in */
this->fi_fs = this->mount != NULL ?
stringof(this->mount->mnt_stat.f_fstypename) : "";
this->fi_mount = this->mount != NULL ?
stringof(this->mount->mnt_stat.f_mntonname) : "";
this->d_name = args[0]->v_cache_dd != NULL ?
stringof(args[0]->v_cache_dd->nc_name) : "";
}
$PROBE:entry /this->vp == 0 || this->fi_fs == 0 ||
this->fi_fs == "devfs" || this->fi_fs == "" ||
this->fi_name == ""/ /* probe ID 3 */
{
this->ncp = 0;
}
/*********************************************************/
$PROBE:entry /this->ncp/ /* probe ID 4 (depth 1) */
{
this->dvp = this->ncp->nc_dvp != NULL ? (
this->ncp->nc_dvp != NULL ?
this->ncp->nc_dvp->v_cache_dst.tqh_first : 0
) : 0;
this->name1 = this->dvp != 0 ? (
this->dvp->nc_name != 0 ? stringof(this->dvp->nc_name) : ""
) : "";
}
$PROBE:entry /this->name1 == 0 || this->fi_fs == 0 ||
this->fi_fs == "devfs" || this->fi_fs == "" ||
this->name1 == "/" || this->name1 == ""/ /* probe ID 5 */
{
this->dvp = 0;
}
/*********************************************************/
/*
* BEGIN Pathname-depth iterators
*/
$( awk -v ID=6 -v MAX_DEPTH=$MAX_DEPTH '
buf = buf $0 "\n" { }
END {
for (DEPTH = 2; DEPTH <= MAX_DEPTH; DEPTH++) {
$0 = buf
gsub(/DEPTH/, DEPTH)
gsub(/IDNUM/, ID++)
sub(/\n$/, "")
print
}
}
' <<EOFDEPTH
$PROBE:entry /this->dvp/ /* probe ID IDNUM (depth DEPTH) */
{
this->dvp = this->dvp->nc_dvp != NULL ? (
this->dvp->nc_dvp != NULL ?
this->dvp->nc_dvp->v_cache_dst.tqh_first : 0
) : 0;
this->nameDEPTH = this->dvp != 0 ? (
this->dvp->nc_name != 0 ? stringof(this->dvp->nc_name) : ""
) : "";
}
EOFDEPTH
)
/*
* END Pathname-depth iterators
*/
EOF
ACTIONS=$( cat <&9 )
ID=$(( $MAX_DEPTH + 5 ))
############################################################ PRINT ACTION
# The default value is simply `entry'. This is paired with $PROBE (which can be
# auto-probed when unset or NULL) and can be customized to include clauses for
# the final print action which must be true before the print action will run.
PRINT="entry /this->fi_mount != 0/"
############################################################ EVENT TAG
# The EVENT_TAG is run inside the print action after the timestamp has been
# printed. By default, `UID.GID CMD[PID]: ' of the process is printed.
#exec 9<<EOF
#EOF
#EVENT_TAG=$( cat <&9 )
############################################################ DETAILS
# The DETAILS are run after the EVENT_TAG and by default, the program name and
# arguments of the process hitting the PRINT action are shown. This can be
# customized to call-specific information because the `-v' flag of dwatch(8)
# can provide detailed process information for the PRINT action on lines below
# the DETAILS.
#
# NB: Should produce a single-line and not print a trailing newline.
exec 9<<EOF
/*
* Print full path
* NB: Up-to but not including the parent directory (printed below)
*/
printf("%s%s", this->fi_mount, this->fi_mount != 0 ? (
this->fi_mount == "/" ? "" : "/"
) : "/");
$( awk -v MAX_DEPTH=$MAX_DEPTH '
buf = buf $0 "\n" { }
END {
for (N = MAX_DEPTH; N > 0; N--) {
$0 = (N < MAX_DEPTH ? "\t" : "") buf
gsub(/N/, N)
sub(/\n$/, "")
print
}
}
' <<-EOFDEPTH
printf("%s%s", this->name = this->nameN, this->name != "" ? "/" : "");
EOFDEPTH
)
/* Print the parent directory name */
this->name = this->d_name != 0 ? this->d_name : "";
printf("%s%s", this->name, this->name != "" ? "/" : "");
/* Print the entry name */
this->name = this->fi_name != 0 ? this->fi_name : "";
printf("%s", this->name);
/* Print the target */
printf(" -> %s", this->target);
EOF
DETAILS=$( cat <&9 )
################################################################################
# END
################################################################################