1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
This patch implements "magic" lookup for "pid/…", as used when looking up
/proc/self.
The patch comes from the 't/magic-pid' branch
at <https://git.savannah.gnu.org/cgit/hurd/glibc.git>. It squashes
commit 392e52286a302ca6157fbd221295e64ab6b6d8ba (by Justus Winter)
and commit 392e52286a302ca6157fbd221295e64ab6b6d8ba (a subsequent fix by
Samuel Thibault).
From: Justus Winter <4winter@informatik.uni-hamburg.de>
Subject: [PATCH] hurd: Handle `pid' magical lookup retry
* hurd/lookup-retry.c: Handle `pid' magical lookup
retry.
diff --git a/hurd/lookup-retry.c b/hurd/lookup-retry.c
index aee2ba8f93..6ed8de1653 100644
--- a/hurd/lookup-retry.c
+++ b/hurd/lookup-retry.c
@@ -25,6 +25,7 @@
#include <string.h>
#include <_itoa.h>
#include <eloop-threshold.h>
+#include <unistd.h>
/* Translate the error from dir_lookup into the error the user sees. */
static inline error_t
@@ -59,6 +60,7 @@ __hurd_file_name_lookup_retry (error_t (*use_init_port)
error_t err;
char *file_name;
int nloops;
+ file_t lastdir = MACH_PORT_NULL;
error_t lookup_op (file_t startdir)
{
@@ -107,14 +109,15 @@ __hurd_file_name_lookup_retry (error_t (*use_init_port)
{
case FS_RETRY_REAUTH:
if (err = reauthenticate (*result))
- return err;
+ goto out;
/* Fall through. */
case FS_RETRY_NORMAL:
if (nloops++ >= __eloop_threshold ())
{
__mach_port_deallocate (__mach_task_self (), *result);
- return ELOOP;
+ err = ELOOP;
+ goto out;
}
/* An empty RETRYNAME indicates we have the final port. */
@@ -174,7 +177,7 @@ __hurd_file_name_lookup_retry (error_t (*use_init_port)
if (err)
__mach_port_deallocate (__mach_task_self (), *result);
- return err;
+ goto out;
}
startdir = *result;
@@ -189,7 +192,10 @@ __hurd_file_name_lookup_retry (error_t (*use_init_port)
if (*result != MACH_PORT_NULL)
__mach_port_deallocate (__mach_task_self (), *result);
if (nloops++ >= __eloop_threshold ())
- return ELOOP;
+ {
+ err = ELOOP;
+ goto out;
+ }
file_name = &retryname[1];
break;
@@ -208,7 +214,8 @@ __hurd_file_name_lookup_retry (error_t (*use_init_port)
(*end != '/' && *end != '\0'))
{
errno = save;
- return ENOENT;
+ err = ENOENT;
+ goto out;
}
if (! get_dtable_port)
err = EGRATUITOUS;
@@ -226,9 +233,12 @@ __hurd_file_name_lookup_retry (error_t (*use_init_port)
}
errno = save;
if (err)
- return err;
+ goto out;
if (*end == '\0')
- return 0;
+ {
+ err = 0;
+ goto out;
+ }
else
{
/* Do a normal retry on the remaining components. */
@@ -255,9 +265,12 @@ __hurd_file_name_lookup_retry (error_t (*use_init_port)
if (err = __host_info (__mach_host_self (), HOST_BASIC_INFO,
(integer_t *) &hostinfo,
&hostinfocnt))
- return err;
+ goto out;
if (hostinfocnt != HOST_BASIC_INFO_COUNT)
- return EGRATUITOUS;
+ {
+ err = EGRATUITOUS;
+ goto out;
+ }
p = _itoa (hostinfo.cpu_subtype, &retryname[8], 10, 0);
*--p = '/';
p = _itoa (hostinfo.cpu_type, &retryname[8], 10, 0);
@@ -293,10 +306,11 @@ __hurd_file_name_lookup_retry (error_t (*use_init_port)
}
case '\0':
- return opentty (result);
+ err = opentty (result);
+ goto out;
case '/':
if (err = opentty (&startdir))
- return err;
+ goto out;
strcpy (retryname, &retryname[4]);
break;
default:
@@ -306,14 +320,48 @@ __hurd_file_name_lookup_retry (error_t (*use_init_port)
goto bad_magic;
break;
+ case 'p':
+ if (retryname[1] == 'i' && retryname[2] == 'd' &&
+ (retryname[3] == '/' || retryname[3] == 0))
+ {
+ char *p, buf[1024]; /* XXX */
+ size_t len;
+ p = _itoa (__getpid (), &buf[sizeof buf], 10, 0);
+ len = &buf[sizeof buf] - p;
+ memcpy (buf, p, len);
+ strcpy (buf + len, &retryname[3]);
+ strcpy (retryname, buf);
+
+ /* Do a normal retry on the remaining components. */
+ __mach_port_mod_refs (__mach_task_self (), lastdir,
+ MACH_PORT_RIGHT_SEND, 1);
+ startdir = lastdir;
+ file_name = retryname;
+ }
+ else
+ goto bad_magic;
+ break;
+
default:
bad_magic:
- return EGRATUITOUS;
+ err = EGRATUITOUS;
+ goto out;
}
break;
default:
- return EGRATUITOUS;
+ err = EGRATUITOUS;
+ goto out;
+ }
+
+ if (MACH_PORT_VALID (*result) && *result != lastdir)
+ {
+ if (MACH_PORT_VALID (lastdir))
+ __mach_port_deallocate (__mach_task_self (), lastdir);
+
+ lastdir = *result;
+ __mach_port_mod_refs (__mach_task_self (), lastdir,
+ MACH_PORT_RIGHT_SEND, 1);
}
if (startdir != MACH_PORT_NULL)
@@ -326,6 +374,10 @@ __hurd_file_name_lookup_retry (error_t (*use_init_port)
err = (*use_init_port) (dirport, &lookup_op);
} while (! err);
+out:
+ if (MACH_PORT_VALID (lastdir))
+ __mach_port_deallocate (__mach_task_self (), lastdir);
+
return err;
}
weak_alias (__hurd_file_name_lookup_retry, hurd_file_name_lookup_retry)
|
