diff options
Diffstat (limited to 'src/lib/shm_rbuff.c')
| -rw-r--r-- | src/lib/shm_rbuff.c | 215 |
1 files changed, 0 insertions, 215 deletions
diff --git a/src/lib/shm_rbuff.c b/src/lib/shm_rbuff.c deleted file mode 100644 index 22cff41c..00000000 --- a/src/lib/shm_rbuff.c +++ /dev/null @@ -1,215 +0,0 @@ -/* - * Ouroboros - Copyright (C) 2016 - 2024 - * - * Ring buffer implementations for incoming packets - * - * Dimitri Staessens <dimitri@ouroboros.rocks> - * Sander Vrijders <sander@ouroboros.rocks> - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public License - * version 2.1 as published by the Free Software Foundation. - * - * This library is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with this library; if not, write to the Free Software - * Foundation, Inc., http://www.fsf.org/about/contact/. - */ - -#define _POSIX_C_SOURCE 200809L - -#include "config.h" - -#include <ouroboros/shm_rbuff.h> -#include <ouroboros/lockfile.h> -#include <ouroboros/errno.h> -#include <ouroboros/fccntl.h> -#include <ouroboros/pthread.h> -#include <ouroboros/time.h> - -#include <assert.h> -#include <fcntl.h> -#include <signal.h> -#include <stdbool.h> -#include <stdint.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <unistd.h> -#include <sys/mman.h> -#include <sys/stat.h> - -#define FN_MAX_CHARS 255 - -#define SHM_RB_FILE_SIZE ((SHM_RBUFF_SIZE) * sizeof(ssize_t) \ - + 3 * sizeof(size_t) \ - + sizeof(pthread_mutex_t) \ - + 2 * sizeof (pthread_cond_t)) - -#define shm_rbuff_used(rb) ((*rb->head + (SHM_RBUFF_SIZE) - *rb->tail) \ - & ((SHM_RBUFF_SIZE) - 1)) -#define shm_rbuff_free(rb) (shm_rbuff_used(rb) + 1 < (SHM_RBUFF_SIZE)) -#define shm_rbuff_empty(rb) (*rb->head == *rb->tail) -#define head_el_ptr(rb) (rb->shm_base + *rb->head) -#define tail_el_ptr(rb) (rb->shm_base + *rb->tail) - -struct shm_rbuff { - ssize_t * shm_base; /* start of entry */ - size_t * head; /* start of ringbuffer head */ - size_t * tail; /* start of ringbuffer tail */ - size_t * acl; /* access control */ - pthread_mutex_t * lock; /* lock all free space in shm */ - pthread_cond_t * add; /* packet arrived */ - pthread_cond_t * del; /* packet removed */ - pid_t pid; /* pid of the owner */ - int flow_id; /* flow_id of the flow */ -}; - -#define MM_FLAGS (PROT_READ | PROT_WRITE) - -static struct shm_rbuff * rbuff_create(pid_t pid, - int flow_id, - int flags) -{ - struct shm_rbuff * rb; - int fd; - ssize_t * shm_base; - char fn[FN_MAX_CHARS]; - - sprintf(fn, SHM_RBUFF_PREFIX "%d.%d", pid, flow_id); - - rb = malloc(sizeof(*rb)); - if (rb == NULL) - goto fail_malloc; - - fd = shm_open(fn, flags, 0666); - if (fd == -1) - goto fail_open; - - if ((flags & O_CREAT) && ftruncate(fd, SHM_RB_FILE_SIZE) < 0) - goto fail_truncate; - - shm_base = mmap(NULL, SHM_RB_FILE_SIZE, MM_FLAGS, MAP_SHARED, fd, 0); - if (shm_base == MAP_FAILED) - goto fail_truncate; - - close(fd); - - rb->shm_base = shm_base; - rb->head = (size_t *) (rb->shm_base + (SHM_RBUFF_SIZE)); - rb->tail = rb->head + 1; - rb->acl = rb->tail + 1; - rb->lock = (pthread_mutex_t *) (rb->acl + 1); - rb->add = (pthread_cond_t *) (rb->lock + 1); - rb->del = rb->add + 1; - rb->pid = pid; - rb->flow_id = flow_id; - - return rb; - - fail_truncate: - close(fd); - if (flags & O_CREAT) - shm_unlink(fn); - fail_open: - free(rb); - fail_malloc: - return NULL; -} - -static void rbuff_destroy(struct shm_rbuff * rb) -{ - munmap(rb->shm_base, SHM_RB_FILE_SIZE); - - free(rb); -} - -struct shm_rbuff * shm_rbuff_create(pid_t pid, - int flow_id) -{ - struct shm_rbuff * rb; - pthread_mutexattr_t mattr; - pthread_condattr_t cattr; - mode_t mask; - - mask = umask(0); - - rb = rbuff_create(pid, flow_id, O_CREAT | O_EXCL | O_RDWR); - - umask(mask); - - if (rb == NULL) - goto fail_rb; - - if (pthread_mutexattr_init(&mattr)) - goto fail_mattr; - - pthread_mutexattr_setpshared(&mattr, PTHREAD_PROCESS_SHARED); -#ifdef HAVE_ROBUST_MUTEX - pthread_mutexattr_setrobust(&mattr, PTHREAD_MUTEX_ROBUST); -#endif - if (pthread_mutex_init(rb->lock, &mattr)) - goto fail_mutex; - - if (pthread_condattr_init(&cattr)) - goto fail_cattr; - - pthread_condattr_setpshared(&cattr, PTHREAD_PROCESS_SHARED); -#ifndef __APPLE__ - pthread_condattr_setclock(&cattr, PTHREAD_COND_CLOCK); -#endif - if (pthread_cond_init(rb->add, &cattr)) - goto fail_add; - - if (pthread_cond_init(rb->del, &cattr)) - goto fail_del; - - *rb->acl = ACL_RDWR; - *rb->head = 0; - *rb->tail = 0; - - rb->pid = pid; - rb->flow_id = flow_id; - - pthread_mutexattr_destroy(&mattr); - pthread_condattr_destroy(&cattr); - - return rb; - - fail_del: - pthread_cond_destroy(rb->add); - fail_add: - pthread_condattr_destroy(&cattr); - fail_cattr: - pthread_mutex_destroy(rb->lock); - fail_mutex: - pthread_mutexattr_destroy(&mattr); - fail_mattr: - shm_rbuff_destroy(rb); - fail_rb: - return NULL; -} - -struct shm_rbuff * shm_rbuff_open(pid_t pid, - int flow_id) -{ - return rbuff_create(pid, flow_id, O_RDWR); -} - -void shm_rbuff_close(struct shm_rbuff * rb) -{ - assert(rb); - - rbuff_destroy(rb); -} - -#if (defined(SHM_RBUFF_LOCKLESS) && \ - (defined(__GNUC__) || defined (__clang__))) -#include "shm_rbuff_ll.c" -#else -#include "shm_rbuff_pthr.c" -#endif |