| 1 | /* Copyright (C) 1994-2024 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library; if not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | #include <assert.h> |
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| 19 | #include <mach.h> |
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| 20 | #include <mach/mig_support.h> |
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| 21 | #include <tls.h> |
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| 22 | |
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| 23 | /* These functions are called by MiG-generated code. */ |
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| 24 | |
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| 25 | #if !defined (SHARED) || IS_IN (rtld) |
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| 26 | mach_port_t __hurd_reply_port0; |
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| 27 | #endif |
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| 28 | |
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| 29 | static mach_port_t |
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| 30 | get_reply_port (void) |
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| 31 | { |
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| 32 | #if !defined (SHARED) || IS_IN (rtld) |
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| 33 | if (__LIBC_NO_TLS ()) |
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| 34 | return __hurd_reply_port0; |
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| 35 | #endif |
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| 36 | return THREAD_GETMEM (THREAD_SELF, reply_port); |
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| 37 | } |
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| 38 | |
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| 39 | static void |
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| 40 | set_reply_port (mach_port_t port) |
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| 41 | { |
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| 42 | #if !defined (SHARED) || IS_IN (rtld) |
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| 43 | if (__LIBC_NO_TLS ()) |
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| 44 | __hurd_reply_port0 = port; |
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| 45 | else |
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| 46 | #endif |
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| 47 | THREAD_SETMEM (THREAD_SELF, reply_port, port); |
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| 48 | } |
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| 49 | |
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| 50 | /* Called by MiG to get a reply port. */ |
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| 51 | mach_port_t |
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| 52 | __mig_get_reply_port (void) |
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| 53 | { |
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| 54 | mach_port_t port = get_reply_port (); |
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| 55 | if (__glibc_unlikely (port == MACH_PORT_NULL)) |
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| 56 | { |
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| 57 | port = __mach_reply_port (); |
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| 58 | set_reply_port (port); |
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| 59 | } |
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| 60 | return port; |
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| 61 | } |
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| 62 | weak_alias (__mig_get_reply_port, mig_get_reply_port) |
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| 63 | libc_hidden_def (__mig_get_reply_port) |
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| 64 | |
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| 65 | /* Called by MiG to deallocate the reply port. */ |
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| 66 | void |
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| 67 | __mig_dealloc_reply_port (mach_port_t arg) |
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| 68 | { |
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| 69 | error_t err; |
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| 70 | mach_port_t port = get_reply_port (); |
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| 71 | |
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| 72 | set_reply_port (MACH_PORT_NULL); /* So the mod_refs RPC won't use it. */ |
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| 73 | assert (port == arg); |
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| 74 | if (!MACH_PORT_VALID (port)) |
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| 75 | return; |
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| 76 | |
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| 77 | err = __mach_port_mod_refs (__mach_task_self (), port, |
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| 78 | MACH_PORT_RIGHT_RECEIVE, -1); |
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| 79 | if (err == KERN_INVALID_RIGHT) |
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| 80 | /* It could be that during signal handling, the receive right had been |
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| 81 | replaced with a dead name. */ |
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| 82 | err = __mach_port_mod_refs (__mach_task_self (), port, |
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| 83 | MACH_PORT_RIGHT_DEAD_NAME, -1); |
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| 84 | |
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| 85 | assert_perror (err); |
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| 86 | } |
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| 87 | weak_alias (__mig_dealloc_reply_port, mig_dealloc_reply_port) |
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| 88 | libc_hidden_def (__mig_dealloc_reply_port) |
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| 89 | |
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| 90 | /* Called by mig interfaces when done with a port. Used to provide the |
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| 91 | same interface as needed when a custom allocator is used. */ |
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| 92 | void |
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| 93 | __mig_put_reply_port(mach_port_t port) |
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| 94 | { |
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| 95 | /* Do nothing. */ |
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| 96 | } |
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| 97 | weak_alias (__mig_put_reply_port, mig_put_reply_port) |
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| 98 | |
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| 99 | /* Called at startup with STACK == NULL. When per-thread variables are set |
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| 100 | up, this is called again with STACK set to the new stack being switched |
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| 101 | to, where per-thread variables should be set up. */ |
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| 102 | void |
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| 103 | __mig_init (void *stack) |
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| 104 | { |
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| 105 | /* Do nothing. */ |
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| 106 | } |
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| 107 | weak_alias (__mig_init, mig_init) |
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| 108 | libc_hidden_def (__mig_init) |
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| 109 | |
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