xnu-792.13.8.tar.gz

[apple/xnu.git] / bsd / kern / sys_pipe.c

diff --git a/bsd/kern/sys_pipe.c b/bsd/kern/sys_pipe.c
index 2fb396aa0d37f55fe1f14ac869c2df2a070264a6..29f6a7202b6fb974979708c269a44003d490cd8b 100644 (file)
--- a/bsd/kern/sys_pipe.c
+++ b/bsd/kern/sys_pipe.c
@@ -19,23 +19,31 @@
 /*
  * Copyright (c) 2003-2004 Apple Computer, Inc. All rights reserved.
  *
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
  * 
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License").  You may not use this file except in compliance with the
- * License.  Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
- * 
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
- * License for the specific language governing rights and limitations
- * under the License.
- * 
- * @APPLE_LICENSE_HEADER_END@
+ * This file contains Original Code and/or Modifications of Original Code 
+ * as defined in and that are subject to the Apple Public Source License 
+ * Version 2.0 (the 'License'). You may not use this file except in 
+ * compliance with the License.  The rights granted to you under the 
+ * License may not be used to create, or enable the creation or 
+ * redistribution of, unlawful or unlicensed copies of an Apple operating 
+ * system, or to circumvent, violate, or enable the circumvention or 
+ * violation of, any terms of an Apple operating system software license 
+ * agreement.
+ *
+ * Please obtain a copy of the License at 
+ * http://www.opensource.apple.com/apsl/ and read it before using this 
+ * file.
+ *
+ * The Original Code and all software distributed under the License are 
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 
+ * Please see the License for the specific language governing rights and 
+ * limitations under the License.
+ *
+ * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  */
 
 /*
@@ -105,6 +113,7 @@
 #include <sys/signalvar.h>
 #include <sys/pipe.h>
 #include <sys/sysproto.h>
+#include <sys/proc_info.h>
 
 #include <bsm/audit_kernel.h>
 
@@ -260,14 +269,12 @@ pipeinit(void *dummy __unused)
         * allocate lock group attribute and group for pipe mutexes
         */
        pipe_mtx_grp_attr = lck_grp_attr_alloc_init();
-       //lck_grp_attr_setstat(pipe_mtx_grp_attr);
        pipe_mtx_grp = lck_grp_alloc_init("pipe", pipe_mtx_grp_attr);
 
        /*
         * allocate the lock attribute for pipe mutexes
         */
        pipe_mtx_attr = lck_attr_alloc_init();
-       //lck_attr_setdebug(pipe_mtx_attr);
 }
 
 
@@ -1410,7 +1417,7 @@ pipe_free_kmem(struct pipe *cpipe)
        if (cpipe->pipe_buffer.buffer != NULL) {
                if (cpipe->pipe_buffer.size > PIPE_SIZE)
                        OSAddAtomic(-1, (SInt32 *)&nbigpipe);
-               OSAddAtomic(cpipe->pipe_buffer.size, (SInt32 *)&amountpipekva);
+               OSAddAtomic(-(cpipe->pipe_buffer.size), (SInt32 *)&amountpipekva);
                OSAddAtomic(-1, (SInt32 *)&amountpipes);
 
                kmem_free(kernel_map, (vm_offset_t)cpipe->pipe_buffer.buffer,
@@ -1644,3 +1651,66 @@ filt_pipewrite(struct knote *kn, long hint)
        return (kn->kn_data >= ((kn->kn_sfflags & NOTE_LOWAT) ?
                                 kn->kn_sdata : PIPE_BUF));
 }
+
+int
+fill_pipeinfo(struct pipe * cpipe, struct pipe_info * pinfo)
+{
+#ifdef MAC
+        int error;
+#endif
+       struct timeval now;
+       struct stat * ub;
+
+       if (cpipe == NULL)
+               return (EBADF);
+#ifdef MAC
+       PIPE_LOCK(cpipe);
+       error = mac_check_pipe_stat(active_cred, cpipe);
+       PIPE_UNLOCK(cpipe);
+       if (error)
+               return (error);
+#endif
+       if (cpipe->pipe_buffer.buffer == 0) {
+               /*
+                * must be stat'ing the write fd
+                */
+               cpipe = cpipe->pipe_peer;
+
+               if (cpipe == NULL)
+                       return (EBADF);
+       }
+
+       ub = &pinfo->pipe_stat;
+
+       bzero(ub, sizeof(*ub));
+       ub->st_mode = S_IFIFO | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP;
+       ub->st_blksize = cpipe->pipe_buffer.size;
+       ub->st_size = cpipe->pipe_buffer.cnt;
+       if (ub->st_blksize != 0);
+               ub->st_blocks = (ub->st_size + ub->st_blksize - 1) / ub->st_blksize;
+       ub->st_nlink = 1;
+
+       ub->st_uid = kauth_getuid();
+       ub->st_gid = kauth_getgid();
+
+       microtime(&now);
+       ub->st_atimespec.tv_sec  = now.tv_sec;
+       ub->st_atimespec.tv_nsec = now.tv_usec * 1000;
+
+       ub->st_mtimespec.tv_sec  = now.tv_sec;
+       ub->st_mtimespec.tv_nsec = now.tv_usec * 1000;
+
+       ub->st_ctimespec.tv_sec  = now.tv_sec;
+       ub->st_ctimespec.tv_nsec = now.tv_usec * 1000;
+
+       /*
+        * Left as 0: st_dev, st_ino, st_nlink, st_rdev, st_flags, st_gen, st_uid, st_gid.
+        * XXX (st_dev, st_ino) should be unique.
+        */
+
+       pinfo->pipe_handle = (uint64_t)((uintptr_t)cpipe);
+       pinfo->pipe_peerhandle = (uint64_t)((uintptr_t)(cpipe->pipe_peer));
+       pinfo->pipe_status = cpipe->pipe_state;
+       return (0);
+}
+