1 /*-
2 * Copyright (c) 1994 Christos Zoulas
3 * Copyright (c) 1995 Frank van der Linden
4 * Copyright (c) 1995 Scott Bartram
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * from: svr4_util.c,v 1.5 1995/01/22 23:44:50 christos Exp
30 */
31
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD: src/sys/compat/linux/linux_util.c,v 1.26.2.2 2005/04/23 21:56:04 ps Exp $");
34
35 #include <sys/param.h>
36 #include <sys/lock.h>
37 #include <sys/malloc.h>
38 #include <sys/mutex.h>
39 #include <sys/namei.h>
40 #include <sys/proc.h>
41 #include <sys/syscallsubr.h>
42 #include <sys/systm.h>
43 #include <sys/vnode.h>
44
45 #include <machine/stdarg.h>
46
47 #include <compat/linux/linux_util.h>
48
49 const char linux_emul_path[] = "/compat/linux";
50
51 /*
52 * Search an alternate path before passing pathname arguments on
53 * to system calls. Useful for keeping a separate 'emulation tree'.
54 *
55 * If cflag is set, we check if an attempt can be made to create
56 * the named file, i.e. we check if the directory it should
57 * be in exists.
58 */
59 int
60 linux_emul_find(td, sgp, path, pbuf, cflag)
61 struct thread *td;
62 caddr_t *sgp; /* Pointer to stackgap memory */
63 char *path;
64 char **pbuf;
65 int cflag;
66 {
67 char *newpath;
68 size_t sz;
69 int error;
70
71 error = linux_emul_convpath(td, path, (sgp == NULL) ? UIO_SYSSPACE :
72 UIO_USERSPACE, &newpath, cflag);
73 if (newpath == NULL)
74 return (error);
75
76 if (sgp == NULL) {
77 *pbuf = newpath;
78 return (error);
79 }
80
81 sz = strlen(newpath);
82 *pbuf = stackgap_alloc(sgp, sz + 1);
83 if (*pbuf != NULL)
84 error = copyout(newpath, *pbuf, sz + 1);
85 else
86 error = ENAMETOOLONG;
87 free(newpath, M_TEMP);
88
89 return (error);
90 }
91
92 int
93 linux_emul_convpath(td, path, pathseg, pbuf, cflag)
94 struct thread *td;
95 char *path;
96 enum uio_seg pathseg;
97 char **pbuf;
98 int cflag;
99 {
100
101 return (kern_alternate_path(td, linux_emul_path, path, pathseg, pbuf,
102 cflag));
103 }
104
105 void
106 linux_msg(const struct thread *td, const char *fmt, ...)
107 {
108 va_list ap;
109 struct proc *p;
110
111 p = td->td_proc;
112 printf("linux: pid %d (%s): ", (int)p->p_pid, p->p_comm);
113 va_start(ap, fmt);
114 vprintf(fmt, ap);
115 va_end(ap);
116 printf("\n");
117 }
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