Annotation of src/usr.bin/pmdb/process.c, Revision 1.4
1.4 ! todd 1: /* $OpenBSD: process.c,v 1.3 2002/03/19 07:26:58 fgsch Exp $ */
1.1 art 2: /*
3: * Copyright (c) 2002 Artur Grabowski <art@openbsd.org>
4: * All rights reserved.
5: *
6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions
8: * are met:
9: *
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. The name of the author may not be used to endorse or promote products
13: * derived from this software without specific prior written permission.
14: *
15: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
16: * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
17: * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
18: * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
21: * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
22: * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
23: * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
24: * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25: */
26:
27: #include <sys/types.h>
28: #include <sys/ptrace.h>
29: #include <sys/wait.h>
1.4 ! todd 30: #include <sys/stat.h>
! 31:
1.3 fgsch 32: #include <err.h>
33: #include <errno.h>
34: #include <signal.h>
35: #include <stdio.h>
1.1 art 36: #include <stdlib.h>
1.3 fgsch 37: #include <string.h>
1.1 art 38: #include <unistd.h>
39:
40: #include "pmdb.h"
41: #include "symbol.h"
42: #include "break.h"
43:
44: int
45: process_load(struct pstate *ps)
46: {
47: int status;
48:
49: if (ps->ps_state == LOADED)
50: return (0);
1.3 fgsch 51:
52: if (access(*ps->ps_argv, R_OK|X_OK) < 0) {
53: fprintf(stderr, "%s: %s.\n", *ps->ps_argv,
54: strerror(errno));
55: return (0);
56: }
1.1 art 57:
1.4 ! todd 58: if (stat(ps->ps_argv[0], &(ps->exec_stat)) < 0)
! 59: err(1, "stat()");
! 60:
! 61: if (ps->ps_pid != 0) {
! 62: /* attach to an already running process */
! 63: if (ptrace(PT_ATTACH, ps->ps_pid, (caddr_t) 0, 0) < 0)
! 64: err(1, "failed to ptrace process");
! 65: ps->ps_state = STOPPED;
! 66: ps->ps_flags |= PSF_ATCH;
! 67: }
! 68: else {
! 69: switch (ps->ps_pid = fork()) {
! 70: case 0:
! 71: if (ptrace(PT_TRACE_ME, getpid(), NULL, 0) != 0)
! 72: err(1, "ptrace(PT_TRACE_ME)");
! 73: execvp(*ps->ps_argv, ps->ps_argv);
! 74: err(1, "exec");
! 75: /* NOTREACHED */
! 76: case -1:
! 77: err(1, "fork");
! 78: /* NOTREACHED */
! 79: default:
! 80: break;
! 81: }
! 82:
! 83: ps->ps_state = LOADED;
1.1 art 84: }
85:
86: if ((ps->ps_flags & PSF_SYMBOLS) == 0) {
87: sym_init_exec(ps, ps->ps_argv[0]);
88: ps->ps_flags |= PSF_SYMBOLS;
89: }
90:
91: if (wait(&status) == 0)
92: err(1, "wait");
93:
94: return 0;
95: }
96:
97: int
98: process_kill(struct pstate *ps)
99: {
100: switch(ps->ps_state) {
101: case LOADED:
102: case RUNNING:
103: case STOPPED:
104: if (ptrace(PT_KILL, ps->ps_pid, NULL, 0) != 0)
105: err(1, "ptrace(PT_KILL)");
106: return 1;
107: default:
108: return 0;
109: }
110: }
111:
112: int
113: cmd_process_kill(int argc, char **argv, void *arg)
114: {
115: struct pstate *ps = arg;
116:
117: process_kill(ps);
118:
119: return 1;
120: }
121:
122: int
123: process_bkpt_main(struct pstate *ps, void *arg)
124: {
125: sym_update(ps);
126:
127: return BKPT_DEL_CONT;
128: }
129:
130: int
131: cmd_process_run(int argc, char **argv, void *arg)
132: {
133: struct pstate *ps = arg;
134:
135: if (ps->ps_state == NONE) {
136: reg main_addr;
137:
138: process_load(ps);
139: if (sym_lookup(ps, "main", &main_addr))
140: warnx("no main");
141: else if (bkpt_add_cb(ps, main_addr, process_bkpt_main, NULL))
142: warn("no bkpt at main 0x%lx", main_addr);
143: }
144:
145: if (ps->ps_state != LOADED) {
146: fprintf(stderr, "Process already running.\n");
147: return 0;
148: }
149:
150: /*
151: * XXX - there isn't really any difference between STOPPED and
152: * LOADED, we should probably get rid of one.
153: */
154: ps->ps_state = STOPPED;
155: ps->ps_signum = 0;
156:
157: return (cmd_process_cont(argc, argv, arg));
158: }
159:
160: int
161: cmd_process_cont(int argc, char **argv, void *arg)
162: {
163: struct pstate *ps = arg;
164: int signum;
165: int req = (ps->ps_flags & PSF_STEP) ? PT_STEP : PT_CONTINUE;
166:
167: if (ps->ps_state != STOPPED) {
168: fprintf(stderr, "Process not loaded and stopped %d\n",
169: ps->ps_state);
170: return (0);
171: }
172:
173: /* Catch SIGINT and SIGTRAP, pass all other signals. */
174: switch (ps->ps_signum) {
175: case SIGINT:
176: case SIGTRAP:
177: signum = 0;
178: break;
179: default:
180: signum = ps->ps_signum;
181: break;
182: }
183:
184: if (ptrace(req, ps->ps_pid, (caddr_t)ps->ps_npc, signum) != 0) {
185: err(1, "ptrace(%s)", req == PT_STEP ? "PT_STEP":"PT_CONTINUE");
186: }
187:
188: ps->ps_state = RUNNING;
189: ps->ps_npc = 1;
190:
191: return (1);
192: }
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