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
40 proc_attach(pid_t pid, int flags, struct proc_handle **pphdl)
42 struct proc_handle *phdl;
47 if (pid == 0 || pphdl == NULL)
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;
62 EV_SET(&kev, pid, EVFILT_PROC, EV_ADD | EV_ONESHOT, NOTE_EXIT,
65 if ((phdl->kq = kqueue()) == -1)
66 err(1, "ERROR: cannot create kernel evet queue");
68 if (kevent(phdl->kq, &kev, 1, NULL, 0, NULL) < 0)
69 err(2, "ERROR: cannot monitor child process %d", pid);
71 if (ptrace(PT_ATTACH, phdl->pid, NULL, 0) != 0)
74 /* Wait for the child process to stop. */
75 else if (waitpid(pid, &status, WUNTRACED) == -1)
76 err(3, "ERROR: child process %d didn't stop as expected", pid);
78 /* Check for an unexpected status. */
79 else if (WIFSTOPPED(status) == 0)
80 err(4, "ERROR: child process %d status 0x%x", pid, status);
82 phdl->status = PS_STOP;
93 proc_create(const char *file, char * const *argv, struct proc_handle **pphdl)
95 struct proc_handle *phdl;
102 * Allocate memory for the process handle, a structure containing
103 * all things related to the process.
105 if ((phdl = malloc(sizeof(struct proc_handle))) == NULL)
108 /* Fork a new process. */
109 if ((pid = fork()) == -1)
112 /* The child expects to be traced. */
113 if (ptrace(PT_TRACE_ME, 0, 0, 0) != 0)
116 /* Execute the specified file: */
119 /* Couldn't execute the file. */
122 /* The parent owns the process handle. */
123 memset(phdl, 0, sizeof(struct proc_handle));
125 phdl->status = PS_IDLE;
127 EV_SET(&kev, pid, EVFILT_PROC, EV_ADD | EV_ONESHOT, NOTE_EXIT,
130 if ((phdl->kq = kqueue()) == -1)
131 err(1, "ERROR: cannot create kernel evet queue");
133 if (kevent(phdl->kq, &kev, 1, NULL, 0, NULL) < 0)
134 err(2, "ERROR: cannot monitor child process %d", pid);
136 /* Wait for the child process to stop. */
137 if (waitpid(pid, &status, WUNTRACED) == -1)
138 err(3, "ERROR: child process %d didn't stop as expected", pid);
140 /* Check for an unexpected status. */
141 if (WIFSTOPPED(status) == 0)
142 err(4, "ERROR: child process %d status 0x%x", pid, status);
144 phdl->status = PS_STOP;
156 proc_free(struct proc_handle *phdl)