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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <signal.h>
#include <libproc.h>
static int start(char *);
static int lwpstart(int *, const lwpstatus_t *, const lwpsinfo_t *);
static char *command;
static const char *lwps;
static struct ps_prochandle *P;
int
main(int argc, char **argv)
{
int rc = 0;
if ((command = strrchr(argv[0], '/')) != NULL)
command++;
else
command = argv[0];
if (argc <= 1) {
(void) fprintf(stderr, "usage:\t%s pid[/lwps] ...\n", command);
(void) fprintf(stderr, " (set stopped processes or lwps "
"running)\n");
return (2);
}
while (--argc > 0)
rc += start(*++argv);
return (rc);
}
static int
start(char *arg)
{
int gcode;
int rc = 0;
if ((P = proc_arg_xgrab(arg, NULL, PR_ARG_PIDS, PGRAB_FORCE |
PGRAB_RETAIN | PGRAB_NOSTOP, &gcode, &lwps)) == NULL) {
(void) fprintf(stderr, "%s: cannot control %s: %s\n",
command, arg, Pgrab_error(gcode));
return (1);
}
/*
* If the victim is stopped because of a job control signal, we
* need to send it SIGCONT to get it moving again, otherwise
* the agent will not be able to run, and so will not be able to
* exit the process.
*/
(void) kill(Pstatus(P)->pr_pid, SIGCONT);
/*
* if the agent already exists, Pcreate_agent will adopt the
* extant agent so that we can destroy it
*/
if (Pstatus(P)->pr_lwp.pr_flags & PR_AGENT) {
if (Pcreate_agent(P) != 0) {
(void) fprintf(stderr,
"%s: cannot remove agent from %s: %s\n",
command, arg, strerror(errno));
Prelease(P, 0);
return (1);
}
Pdestroy_agent(P);
}
if (lwps != NULL) {
/*
* The user provided an lwp specification. Let's consider the
* lwp specification as a mask. We iterate over all lwps in the
* process and set running every lwp, which matches the mask.
* If there is no lwp matching the mask or an error occured
* during the iteration, set the return code to 1 as indication
* of an error. We need to unset run-on-last-close flag,
* otherwise *all* lwps could be set running after detaching
* from the process and not only lwps, which were selected.
*/
int lwpcount = 0;
(void) Punsetflags(P, PR_RLC);
(void) Plwp_iter_all(P, (proc_lwp_all_f *)lwpstart, &lwpcount);
if (lwpcount == 0) {
(void) fprintf(stderr, "%s: cannot control %s:"
" no matching LWPs found\n", command, arg);
rc = 1;
} else if (lwpcount == -1)
rc = 1;
} else {
(void) Psetrun(P, 0, 0); /* Set the process running. */
}
/*
* Prelease could change the tracing flags or leave the victim hung
* so we free the handle by hand.
*/
Pfree(P);
return (rc);
}
/* ARGSUSED */
static int
lwpstart(int *lwpcount, const lwpstatus_t *status, const lwpsinfo_t *info)
{
struct ps_lwphandle *L;
int gcode;
if (proc_lwp_in_set(lwps, info->pr_lwpid)) {
/*
* There is a race between the callback from the iterator and
* grabbing of the lwp. If the lwp has already exited, Lgrab
* will return the error code G_NOPROC. It's not a real error,
* only if there is no lwp matching the specification.
*/
if ((L = Lgrab(P, info->pr_lwpid, &gcode)) != NULL) {
(void) Lsetrun(L, 0, 0);
Lfree(L);
if (*lwpcount >= 0)
(*lwpcount)++;
} else if (gcode != G_NOPROC) {
(void) fprintf(stderr, "%s: cannot control %d/%d: %s\n",
command, (int)Pstatus(P)->pr_pid,
(int)info->pr_lwpid, Lgrab_error(gcode));
*lwpcount = -1;
}
}
return (0);
}
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