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
41 proc_attach(pid_t pid, int flags, struct proc_handle **pphdl)
43 struct proc_handle *phdl;
47 if (pid == 0 || pid == getpid())
51 * Allocate memory for the process handle, a structure containing
52 * all things related to the process.
54 if ((phdl = malloc(sizeof(struct proc_handle))) == NULL)
57 memset(phdl, 0, sizeof(struct proc_handle));
60 phdl->status = PS_RUN;
61 elf_version(EV_CURRENT);
63 if (ptrace(PT_ATTACH, phdl->pid, 0, 0) != 0) {
65 DPRINTF("ERROR: cannot ptrace child process %d", pid);
69 /* Wait for the child process to stop. */
70 if (waitpid(pid, &status, WUNTRACED) == -1) {
72 DPRINTF("ERROR: child process %d didn't stop as expected", pid);
76 /* Check for an unexpected status. */
77 if (WIFSTOPPED(status) == 0)
78 DPRINTF("ERROR: child process %d status 0x%x", pid, status);
80 phdl->status = PS_STOP;
91 proc_create(const char *file, char * const *argv, proc_child_func *pcf,
92 void *child_arg, struct proc_handle **pphdl)
94 struct proc_handle *phdl;
100 * Allocate memory for the process handle, a structure containing
101 * all things related to the process.
103 if ((phdl = malloc(sizeof(struct proc_handle))) == NULL)
106 elf_version(EV_CURRENT);
108 /* Fork a new process. */
109 if ((pid = vfork()) == -1)
112 /* The child expects to be traced. */
113 if (ptrace(PT_TRACE_ME, 0, 0, 0) != 0)
119 /* Execute the specified file: */
122 /* Couldn't execute the file. */
125 /* The parent owns the process handle. */
126 memset(phdl, 0, sizeof(struct proc_handle));
128 phdl->status = PS_IDLE;
130 /* Wait for the child process to stop. */
131 if (waitpid(pid, &status, WUNTRACED) == -1) {
133 DPRINTF("ERROR: child process %d didn't stop as expected", pid);
137 /* Check for an unexpected status. */
138 if (WIFSTOPPED(status) == 0) {
140 DPRINTF("ERROR: child process %d status 0x%x", pid, status);
143 phdl->status = PS_STOP;
154 proc_free(struct proc_handle *phdl)