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-rw-r--r--3rdparty/plibsys/src/pshm-posix.c311
1 files changed, 311 insertions, 0 deletions
diff --git a/3rdparty/plibsys/src/pshm-posix.c b/3rdparty/plibsys/src/pshm-posix.c
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+++ b/3rdparty/plibsys/src/pshm-posix.c
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+/*
+ * The MIT License
+ *
+ * Copyright (C) 2010-2018 Alexander Saprykin <saprykin.spb@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * 'Software'), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include "perror.h"
+#include "pmem.h"
+#include "psemaphore.h"
+#include "pshm.h"
+#include "perror-private.h"
+#include "pipc-private.h"
+#include "psysclose-private.h"
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <errno.h>
+
+#define P_SHM_SUFFIX "_p_shm_object"
+#define P_SHM_INVALID_HDL -1
+
+struct PShm_ {
+ pboolean shm_created;
+ pchar *platform_key;
+ ppointer addr;
+ psize size;
+ PSemaphore *sem;
+ PShmAccessPerms perms;
+};
+
+static pboolean pp_shm_create_handle (PShm *shm, PError **error);
+static void pp_shm_clean_handle (PShm *shm);
+
+static pboolean
+pp_shm_create_handle (PShm *shm,
+ PError **error)
+{
+ pboolean is_exists;
+ pint fd, flags;
+ struct stat stat_buf;
+
+ if (P_UNLIKELY (shm == NULL || shm->platform_key == NULL)) {
+ p_error_set_error_p (error,
+ (pint) P_ERROR_IPC_INVALID_ARGUMENT,
+ 0,
+ "Invalid input argument");
+ return FALSE;
+ }
+
+ is_exists = FALSE;
+
+ while ((fd = shm_open (shm->platform_key,
+ O_CREAT | O_EXCL | O_RDWR,
+ 0660)) == P_SHM_INVALID_HDL &&
+ p_error_get_last_system () == EINTR)
+ ;
+
+ if (fd == P_SHM_INVALID_HDL) {
+ if (p_error_get_last_system () == EEXIST) {
+ is_exists = TRUE;
+
+ while ((fd = shm_open (shm->platform_key,
+ O_RDWR,
+ 0660)) == P_SHM_INVALID_HDL &&
+ p_error_get_last_system () == EINTR)
+ ;
+ }
+ } else
+ shm->shm_created = TRUE;
+
+ if (P_UNLIKELY (fd == P_SHM_INVALID_HDL)) {
+ p_error_set_error_p (error,
+ (pint) p_error_get_last_ipc (),
+ p_error_get_last_system (),
+ "Failed to call shm_open() to create memory segment");
+ pp_shm_clean_handle (shm);
+ return FALSE;
+ }
+
+ /* Try to get size of the existing file descriptor */
+ if (is_exists) {
+ if (P_UNLIKELY (fstat (fd, &stat_buf) == -1)) {
+ p_error_set_error_p (error,
+ (pint) p_error_get_last_ipc (),
+ p_error_get_last_system (),
+ "Failed to call fstat() to get memory segment size");
+
+ if (P_UNLIKELY (p_sys_close (fd) != 0))
+ P_WARNING ("PShm::pp_shm_create_handle: p_sys_close() failed(1)");
+
+ pp_shm_clean_handle (shm);
+ return FALSE;
+ }
+
+ shm->size = (psize) stat_buf.st_size;
+ } else {
+ if (P_UNLIKELY ((ftruncate (fd, (off_t) shm->size)) == -1)) {
+ p_error_set_error_p (error,
+ (pint) p_error_get_last_ipc (),
+ p_error_get_last_system (),
+ "Failed to call ftruncate() to set memory segment size");
+
+ if (P_UNLIKELY (p_sys_close (fd) != 0))
+ P_WARNING ("PShm::pp_shm_create_handle: p_sys_close() failed(2)");
+
+ pp_shm_clean_handle (shm);
+ return FALSE;
+ }
+ }
+
+ flags = (shm->perms == P_SHM_ACCESS_READONLY) ? PROT_READ : PROT_READ | PROT_WRITE;
+
+ if (P_UNLIKELY ((shm->addr = mmap (NULL, shm->size, flags, MAP_SHARED, fd, 0)) == (void *) -1)) {
+ p_error_set_error_p (error,
+ (pint) p_error_get_last_ipc (),
+ p_error_get_last_system (),
+ "Failed to call mmap() to map memory segment");
+ shm->addr = NULL;
+
+ if (P_UNLIKELY (p_sys_close (fd) != 0))
+ P_WARNING ("PShm::pp_shm_create_handle: p_sys_close() failed(3)");
+
+ pp_shm_clean_handle (shm);
+ return FALSE;
+ }
+
+ if (P_UNLIKELY (p_sys_close (fd) != 0))
+ P_WARNING ("PShm::pp_shm_create_handle: p_sys_close() failed(4)");
+
+ if (P_UNLIKELY ((shm->sem = p_semaphore_new (shm->platform_key, 1,
+ is_exists ? P_SEM_ACCESS_OPEN : P_SEM_ACCESS_CREATE,
+ error)) == NULL)) {
+ pp_shm_clean_handle (shm);
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+static void
+pp_shm_clean_handle (PShm *shm)
+{
+ if (P_UNLIKELY (shm->addr != NULL && munmap (shm->addr, shm->size) == -1))
+ P_ERROR ("PShm::pp_shm_clean_handle: munmap () failed");
+
+ if (shm->shm_created == TRUE && shm_unlink (shm->platform_key) == -1)
+ P_ERROR ("PShm::pp_shm_clean_handle: shm_unlink() failed");
+
+ if (P_LIKELY (shm->sem != NULL)) {
+ p_semaphore_free (shm->sem);
+ shm->sem = NULL;
+ }
+
+ shm->shm_created = FALSE;
+ shm->addr = NULL;
+ shm->size = 0;
+}
+
+P_LIB_API PShm *
+p_shm_new (const pchar *name,
+ psize size,
+ PShmAccessPerms perms,
+ PError **error)
+{
+ PShm *ret;
+ pchar *new_name;
+
+ if (P_UNLIKELY (name == NULL)) {
+ p_error_set_error_p (error,
+ (pint) P_ERROR_IPC_INVALID_ARGUMENT,
+ 0,
+ "Invalid input argument");
+ return NULL;
+ }
+
+ if (P_UNLIKELY ((ret = p_malloc0 (sizeof (PShm))) == NULL)) {
+ p_error_set_error_p (error,
+ (pint) P_ERROR_IPC_NO_RESOURCES,
+ 0,
+ "Failed to allocate memory for shared segment");
+ return NULL;
+ }
+
+ if (P_UNLIKELY ((new_name = p_malloc0 (strlen (name) + strlen (P_SHM_SUFFIX) + 1)) == NULL)) {
+ p_error_set_error_p (error,
+ (pint) P_ERROR_IPC_NO_RESOURCES,
+ 0,
+ "Failed to allocate memory for segment name");
+ p_shm_free (ret);
+ return NULL;
+ }
+
+ strcpy (new_name, name);
+ strcat (new_name, P_SHM_SUFFIX);
+
+#if defined (P_OS_IRIX) || defined (P_OS_TRU64)
+ /* IRIX and Tru64 prefer filename styled IPC names */
+ ret->platform_key = p_ipc_get_platform_key (new_name, FALSE);
+#else
+ ret->platform_key = p_ipc_get_platform_key (new_name, TRUE);
+#endif
+ ret->perms = perms;
+ ret->size = size;
+
+ p_free (new_name);
+
+ if (P_UNLIKELY (pp_shm_create_handle (ret, error) == FALSE)) {
+ p_shm_free (ret);
+ return NULL;
+ }
+
+ if (P_LIKELY (ret->size > size && size != 0))
+ ret->size = size;
+
+ return ret;
+}
+
+P_LIB_API void
+p_shm_take_ownership (PShm *shm)
+{
+ if (P_UNLIKELY (shm == NULL))
+ return;
+
+ shm->shm_created = TRUE;
+ p_semaphore_take_ownership (shm->sem);
+}
+
+P_LIB_API void
+p_shm_free (PShm *shm)
+{
+ if (P_UNLIKELY (shm == NULL))
+ return;
+
+ pp_shm_clean_handle (shm);
+
+ if (P_LIKELY (shm->platform_key != NULL))
+ p_free (shm->platform_key);
+
+ p_free (shm);
+}
+
+P_LIB_API pboolean
+p_shm_lock (PShm *shm,
+ PError **error)
+{
+ if (P_UNLIKELY (shm == NULL)) {
+ p_error_set_error_p (error,
+ (pint) P_ERROR_IPC_INVALID_ARGUMENT,
+ 0,
+ "Invalid input argument");
+ return FALSE;
+ }
+
+ return p_semaphore_acquire (shm->sem, error);
+}
+
+P_LIB_API pboolean
+p_shm_unlock (PShm *shm,
+ PError **error)
+{
+ if (P_UNLIKELY (shm == NULL)) {
+ p_error_set_error_p (error,
+ (pint) P_ERROR_IPC_INVALID_ARGUMENT,
+ 0,
+ "Invalid input argument");
+ return FALSE;
+ }
+
+ return p_semaphore_release (shm->sem, error);
+}
+
+P_LIB_API ppointer
+p_shm_get_address (const PShm *shm)
+{
+ if (P_UNLIKELY (shm == NULL))
+ return NULL;
+
+ return shm->addr;
+}
+
+P_LIB_API psize
+p_shm_get_size (const PShm *shm)
+{
+ if (P_UNLIKELY (shm == NULL))
+ return 0;
+
+ return shm->size;
+}
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