191 lines
5.1 KiB
Diff
191 lines
5.1 KiB
Diff
This patch implements "magic" lookup for "pid/…", as used when looking up
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/proc/self.
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The patch comes from the 't/magic-pid' branch
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at <https://git.savannah.gnu.org/cgit/hurd/glibc.git>. It squashes
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commit 392e52286a302ca6157fbd221295e64ab6b6d8ba (by Justus Winter)
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and commit 392e52286a302ca6157fbd221295e64ab6b6d8ba (a subsequent fix by
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Samuel Thibault).
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From: Justus Winter <4winter@informatik.uni-hamburg.de>
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Subject: [PATCH] hurd: Handle `pid' magical lookup retry
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* hurd/lookup-retry.c: Handle `pid' magical lookup
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retry.
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diff --git a/hurd/lookup-retry.c b/hurd/lookup-retry.c
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index aee2ba8f93..6ed8de1653 100644
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--- a/hurd/lookup-retry.c
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+++ b/hurd/lookup-retry.c
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@@ -25,6 +25,7 @@
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#include <string.h>
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#include <_itoa.h>
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#include <eloop-threshold.h>
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+#include <unistd.h>
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/* Translate the error from dir_lookup into the error the user sees. */
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static inline error_t
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@@ -59,6 +60,7 @@ __hurd_file_name_lookup_retry (error_t (*use_init_port)
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error_t err;
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char *file_name;
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int nloops;
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+ file_t lastdir = MACH_PORT_NULL;
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error_t lookup_op (file_t startdir)
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{
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@@ -107,14 +109,15 @@ __hurd_file_name_lookup_retry (error_t (*use_init_port)
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{
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case FS_RETRY_REAUTH:
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if (err = reauthenticate (*result))
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- return err;
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+ goto out;
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/* Fall through. */
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case FS_RETRY_NORMAL:
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if (nloops++ >= __eloop_threshold ())
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{
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__mach_port_deallocate (__mach_task_self (), *result);
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- return ELOOP;
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+ err = ELOOP;
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+ goto out;
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}
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/* An empty RETRYNAME indicates we have the final port. */
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@@ -174,7 +177,7 @@ __hurd_file_name_lookup_retry (error_t (*use_init_port)
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if (err)
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__mach_port_deallocate (__mach_task_self (), *result);
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- return err;
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+ goto out;
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}
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startdir = *result;
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@@ -189,7 +192,10 @@ __hurd_file_name_lookup_retry (error_t (*use_init_port)
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if (*result != MACH_PORT_NULL)
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__mach_port_deallocate (__mach_task_self (), *result);
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if (nloops++ >= __eloop_threshold ())
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- return ELOOP;
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+ {
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+ err = ELOOP;
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+ goto out;
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+ }
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file_name = &retryname[1];
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break;
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@@ -208,7 +214,8 @@ __hurd_file_name_lookup_retry (error_t (*use_init_port)
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(*end != '/' && *end != '\0'))
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{
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errno = save;
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- return ENOENT;
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+ err = ENOENT;
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+ goto out;
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}
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if (! get_dtable_port)
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err = EGRATUITOUS;
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@@ -226,9 +233,12 @@ __hurd_file_name_lookup_retry (error_t (*use_init_port)
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}
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errno = save;
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if (err)
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- return err;
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+ goto out;
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if (*end == '\0')
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- return 0;
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+ {
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+ err = 0;
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+ goto out;
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+ }
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else
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{
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/* Do a normal retry on the remaining components. */
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@@ -255,9 +265,12 @@ __hurd_file_name_lookup_retry (error_t (*use_init_port)
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if (err = __host_info (__mach_host_self (), HOST_BASIC_INFO,
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(integer_t *) &hostinfo,
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&hostinfocnt))
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- return err;
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+ goto out;
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if (hostinfocnt != HOST_BASIC_INFO_COUNT)
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- return EGRATUITOUS;
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+ {
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+ err = EGRATUITOUS;
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+ goto out;
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+ }
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p = _itoa (hostinfo.cpu_subtype, &retryname[8], 10, 0);
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*--p = '/';
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p = _itoa (hostinfo.cpu_type, &retryname[8], 10, 0);
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@@ -293,10 +306,11 @@ __hurd_file_name_lookup_retry (error_t (*use_init_port)
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}
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case '\0':
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- return opentty (result);
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+ err = opentty (result);
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+ goto out;
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case '/':
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if (err = opentty (&startdir))
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- return err;
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+ goto out;
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strcpy (retryname, &retryname[4]);
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break;
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default:
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@@ -306,14 +320,48 @@ __hurd_file_name_lookup_retry (error_t (*use_init_port)
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goto bad_magic;
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break;
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+ case 'p':
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+ if (retryname[1] == 'i' && retryname[2] == 'd' &&
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+ (retryname[3] == '/' || retryname[3] == 0))
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+ {
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+ char *p, buf[1024]; /* XXX */
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+ size_t len;
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+ p = _itoa (__getpid (), &buf[sizeof buf], 10, 0);
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+ len = &buf[sizeof buf] - p;
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+ memcpy (buf, p, len);
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+ strcpy (buf + len, &retryname[3]);
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+ strcpy (retryname, buf);
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+
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+ /* Do a normal retry on the remaining components. */
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+ __mach_port_mod_refs (__mach_task_self (), lastdir,
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+ MACH_PORT_RIGHT_SEND, 1);
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+ startdir = lastdir;
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+ file_name = retryname;
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+ }
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+ else
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+ goto bad_magic;
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+ break;
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+
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default:
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bad_magic:
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- return EGRATUITOUS;
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+ err = EGRATUITOUS;
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+ goto out;
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}
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break;
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default:
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- return EGRATUITOUS;
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+ err = EGRATUITOUS;
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+ goto out;
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+ }
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+
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+ if (MACH_PORT_VALID (*result) && *result != lastdir)
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+ {
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+ if (MACH_PORT_VALID (lastdir))
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+ __mach_port_deallocate (__mach_task_self (), lastdir);
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+
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+ lastdir = *result;
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+ __mach_port_mod_refs (__mach_task_self (), lastdir,
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+ MACH_PORT_RIGHT_SEND, 1);
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}
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if (startdir != MACH_PORT_NULL)
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@@ -326,6 +374,10 @@ __hurd_file_name_lookup_retry (error_t (*use_init_port)
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err = (*use_init_port) (dirport, &lookup_op);
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} while (! err);
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+out:
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+ if (MACH_PORT_VALID (lastdir))
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+ __mach_port_deallocate (__mach_task_self (), lastdir);
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+
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return err;
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}
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weak_alias (__hurd_file_name_lookup_retry, hurd_file_name_lookup_retry)
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