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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)
|