2 * Copyright (c) 2008 John Birrell (jb@freebsd.org)
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/types.h>
31 #include <sys/sysctl.h>
44 static int proc_init(pid_t, int, int, struct proc_handle *);
47 proc_init(pid_t pid, int flags, int status, struct proc_handle *phdl)
52 memset(phdl, 0, sizeof(*phdl));
55 phdl->status = status;
59 mib[2] = KERN_PROC_PATHNAME;
61 len = sizeof(phdl->execname);
62 if (sysctl(mib, 4, phdl->execname, &len, NULL, 0) != 0) {
64 DPRINTF("ERROR: cannot get pathname for child process %d", pid);
68 phdl->execname[0] = '\0';
74 proc_attach(pid_t pid, int flags, struct proc_handle **pphdl)
76 struct proc_handle *phdl;
80 if (pid == 0 || pid == getpid())
84 * Allocate memory for the process handle, a structure containing
85 * all things related to the process.
87 if ((phdl = malloc(sizeof(struct proc_handle))) == NULL)
90 elf_version(EV_CURRENT);
92 error = proc_init(pid, flags, PS_RUN, phdl);
96 if (ptrace(PT_ATTACH, phdl->pid, 0, 0) != 0) {
98 DPRINTF("ERROR: cannot ptrace child process %d", pid);
102 /* Wait for the child process to stop. */
103 if (waitpid(pid, &status, WUNTRACED) == -1) {
105 DPRINTF("ERROR: child process %d didn't stop as expected", pid);
109 /* Check for an unexpected status. */
110 if (WIFSTOPPED(status) == 0)
111 DPRINTFX("ERROR: child process %d status 0x%x", pid, status);
113 phdl->status = PS_STOP;
124 proc_create(const char *file, char * const *argv, proc_child_func *pcf,
125 void *child_arg, struct proc_handle **pphdl)
127 struct proc_handle *phdl;
133 * Allocate memory for the process handle, a structure containing
134 * all things related to the process.
136 if ((phdl = malloc(sizeof(struct proc_handle))) == NULL)
139 elf_version(EV_CURRENT);
141 /* Fork a new process. */
142 if ((pid = vfork()) == -1)
145 /* The child expects to be traced. */
146 if (ptrace(PT_TRACE_ME, 0, 0, 0) != 0)
152 /* Execute the specified file: */
155 /* Couldn't execute the file. */
158 /* The parent owns the process handle. */
159 error = proc_init(pid, 0, PS_IDLE, phdl);
163 /* Wait for the child process to stop. */
164 if (waitpid(pid, &status, WUNTRACED) == -1) {
166 DPRINTF("ERROR: child process %d didn't stop as expected", pid);
170 /* Check for an unexpected status. */
171 if (WIFSTOPPED(status) == 0) {
173 DPRINTFX("ERROR: child process %d status 0x%x", pid, status);
176 phdl->status = PS_STOP;
187 proc_free(struct proc_handle *phdl)