2 * Copyright (c) 2015 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
18 ssvm_master_init (ssvm_private_t * ssvm, u32 master_index)
24 ssvm_shared_header_t *sh;
25 u64 ticks = clib_cpu_time_now ();
29 if (ssvm->ssvm_size == 0)
30 return SSVM_API_ERROR_NO_SIZE;
32 ssvm_filename = format (0, "/dev/shm/%s%c", ssvm->name, 0);
34 unlink ((char *) ssvm_filename);
36 vec_free (ssvm_filename);
38 ssvm_fd = shm_open ((char *) ssvm->name, O_RDWR | O_CREAT | O_EXCL, 0777);
42 clib_unix_warning ("create segment '%s'", ssvm->name);
43 return SSVM_API_ERROR_CREATE_FAILURE;
46 lseek (ssvm_fd, ssvm->ssvm_size, SEEK_SET);
47 if (write (ssvm_fd, &junk, 1) != 1)
49 clib_unix_warning ("set ssvm size");
51 return SSVM_API_ERROR_SET_SIZE;
55 if (ssvm->requested_va)
58 randomize_baseva = (ticks & 15) * MMAP_PAGESIZE;
60 if (ssvm->requested_va)
61 ssvm->requested_va += randomize_baseva;
64 (ssvm_shared_header_t *) mmap ((void *) ssvm->requested_va,
65 ssvm->ssvm_size, PROT_READ | PROT_WRITE,
68 if (ssvm->sh == MAP_FAILED)
70 clib_unix_warning ("mmap");
72 return SSVM_API_ERROR_MMAP;
77 ssvm->my_pid = getpid ();
78 sh->master_pid = ssvm->my_pid;
79 sh->ssvm_size = ssvm->ssvm_size;
80 sh->heap = mheap_alloc_with_flags
81 (((u8 *) sh) + MMAP_PAGESIZE, ssvm->ssvm_size - MMAP_PAGESIZE,
82 MHEAP_FLAG_DISABLE_VM | MHEAP_FLAG_THREAD_SAFE);
84 sh->ssvm_va = pointer_to_uword (sh);
85 sh->master_index = master_index;
87 oldheap = ssvm_push_heap (sh);
88 sh->name = format (0, "%s%c", ssvm->name, 0);
89 ssvm_pop_heap (oldheap);
91 ssvm->i_am_master = 1;
93 /* The application has to set set sh->ready... */
98 ssvm_slave_init (ssvm_private_t * ssvm, int timeout_in_seconds)
102 ssvm_shared_header_t *sh;
104 ssvm->i_am_master = 0;
106 while (timeout_in_seconds-- > 0)
109 ssvm_fd = shm_open ((char *) ssvm->name, O_RDWR, 0777);
115 if (fstat (ssvm_fd, &stat) < 0)
121 if (stat.st_size > 0)
124 clib_warning ("slave timeout");
125 return SSVM_API_ERROR_SLAVE_TIMEOUT;
128 sh = (void *) mmap (0, MMAP_PAGESIZE, PROT_READ | PROT_WRITE, MAP_SHARED,
130 if (sh == MAP_FAILED)
132 clib_unix_warning ("slave research mmap");
134 return SSVM_API_ERROR_MMAP;
137 while (timeout_in_seconds-- > 0)
143 munmap (sh, MMAP_PAGESIZE);
144 clib_warning ("slave timeout 2");
145 return SSVM_API_ERROR_SLAVE_TIMEOUT;
148 ssvm->requested_va = (u64) sh->ssvm_va;
149 ssvm->ssvm_size = sh->ssvm_size;
150 munmap (sh, MMAP_PAGESIZE);
152 sh = ssvm->sh = (void *) mmap ((void *) ssvm->requested_va, ssvm->ssvm_size,
153 PROT_READ | PROT_WRITE,
154 MAP_SHARED | MAP_FIXED, ssvm_fd, 0);
156 if (sh == MAP_FAILED)
158 clib_unix_warning ("slave final mmap");
160 return SSVM_API_ERROR_MMAP;
162 sh->slave_pid = getpid ();
167 * fd.io coding-style-patch-verification: ON
170 * eval: (c-set-style "gnu")