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
29 #include <sys/types.h>
30 #include <sys/sysctl.h>
43 #include <libprocstat.h>
47 static int getelfclass(int);
48 static int proc_init(pid_t, int, int, struct proc_handle **);
59 if ((e = elf_begin(fd, ELF_C_READ, NULL)) == NULL)
61 if (gelf_getehdr(e, &ehdr) == NULL)
63 class = ehdr.e_ident[EI_CLASS];
70 proc_init(pid_t pid, int flags, int status, struct proc_handle **pphdl)
72 struct kinfo_proc *kp;
73 struct proc_handle *phdl;
74 int error, class, count, fd;
77 if ((phdl = malloc(sizeof(*phdl))) == NULL)
80 memset(phdl, 0, sizeof(*phdl));
83 phdl->status = status;
84 phdl->procstat = procstat_open_sysctl();
85 if (phdl->procstat == NULL)
88 /* Obtain a path to the executable. */
89 if ((kp = procstat_getprocs(phdl->procstat, KERN_PROC_PID, pid,
92 error = procstat_getpathname(phdl->procstat, kp, phdl->execpath,
93 sizeof(phdl->execpath));
94 procstat_freeprocs(phdl->procstat, kp);
98 /* Use it to determine the data model for the process. */
99 if ((fd = open(phdl->execpath, O_RDONLY)) < 0) {
103 class = getelfclass(fd);
106 phdl->model = PR_MODEL_LP64;
109 phdl->model = PR_MODEL_ILP32;
124 proc_attach(pid_t pid, int flags, struct proc_handle **pphdl)
126 struct proc_handle *phdl;
129 if (pid == 0 || pid == getpid())
131 if (elf_version(EV_CURRENT) == EV_NONE)
135 * Allocate memory for the process handle, a structure containing
136 * all things related to the process.
138 error = proc_init(pid, flags, PS_RUN, &phdl);
142 if (ptrace(PT_ATTACH, phdl->pid, 0, 0) != 0) {
144 DPRINTF("ERROR: cannot ptrace child process %d", pid);
148 /* Wait for the child process to stop. */
149 if (waitpid(pid, &status, WUNTRACED) == -1) {
151 DPRINTF("ERROR: child process %d didn't stop as expected", pid);
155 /* Check for an unexpected status. */
156 if (!WIFSTOPPED(status))
157 DPRINTFX("ERROR: child process %d status 0x%x", pid, status);
159 phdl->status = PS_STOP;
162 if (error && phdl != NULL) {
171 proc_create(const char *file, char * const *argv, proc_child_func *pcf,
172 void *child_arg, struct proc_handle **pphdl)
174 struct proc_handle *phdl;
179 if (elf_version(EV_CURRENT) == EV_NONE)
182 /* Fork a new process. */
183 if ((pid = vfork()) == -1)
186 /* The child expects to be traced. */
187 if (ptrace(PT_TRACE_ME, 0, 0, 0) != 0)
193 /* Execute the specified file: */
196 /* Couldn't execute the file. */
200 /* The parent owns the process handle. */
201 error = proc_init(pid, 0, PS_IDLE, &phdl);
205 /* Wait for the child process to stop. */
206 if (waitpid(pid, &status, WUNTRACED) == -1) {
208 DPRINTF("ERROR: child process %d didn't stop as expected", pid);
212 /* Check for an unexpected status. */
213 if (!WIFSTOPPED(status)) {
215 DPRINTFX("ERROR: child process %d status 0x%x", pid, status);
218 phdl->status = PS_STOP;
221 if (error && phdl != NULL) {
230 proc_free(struct proc_handle *phdl)
233 if (phdl->procstat != NULL)
234 procstat_close(phdl->procstat);