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-rw-r--r--kit/shared_memory.posix.c124
1 files changed, 124 insertions, 0 deletions
diff --git a/kit/shared_memory.posix.c b/kit/shared_memory.posix.c
new file mode 100644
index 0000000..fa0db98
--- /dev/null
+++ b/kit/shared_memory.posix.c
@@ -0,0 +1,124 @@
+#include "shared_memory.h"
+
+#if !defined(_WIN32) || defined(__CYGWIN__)
+# include <stdio.h>
+# include <string.h>
+# include <sys/mman.h>
+# include <sys/stat.h>
+# include <fcntl.h>
+# include <unistd.h>
+# include <assert.h>
+
+kit_shared_memory_t kit_shared_memory_open(kit_str_t name, i64 size,
+ i32 mode) {
+ kit_shared_memory_t mem;
+
+ memset(&mem, 0, sizeof mem);
+
+ assert(size > 0);
+ assert(name.size > 0);
+ assert(name.size + 1 <= NAME_MAX);
+ assert(name.values != NULL);
+
+ if (size <= 0) {
+ mem.status = KIT_ERROR_INVALID_SIZE;
+ return mem;
+ }
+
+ if (name.size <= 0) {
+ mem.status = KIT_ERROR_INVALID_NAME;
+ return mem;
+ }
+
+ if (name.size + 1 > NAME_MAX) {
+ mem.status = KIT_ERROR_NAME_TOO_LONG;
+ return mem;
+ }
+
+ for (i64 i = 0; i < name.size; i++)
+ if (name.values[i] == '/' || name.values[i] == '\\') {
+ mem.status = KIT_ERROR_INVALID_NAME;
+ return mem;
+ }
+
+ mem._name[0] = '/';
+ memcpy(mem._name + 1, name.values, name.size);
+ mem._name[1 + name.size] = '\0';
+
+ i32 fd = shm_open(mem._name,
+ mode == KIT_SHARED_MEMORY_CREATE
+ ? O_RDWR | O_CREAT | O_EXCL
+ : O_RDWR,
+ mode == KIT_SHARED_MEMORY_CREATE ? 0660 : 0);
+
+ if (fd == -1) {
+ mem.status = KIT_ERROR_OPEN_FAILED;
+ return mem;
+ }
+
+ if (mode == KIT_SHARED_MEMORY_CREATE && ftruncate(fd, size) == -1) {
+ shm_unlink(mem._name);
+ assert(0);
+ mem.status = KIT_ERROR_TRUNCATE_FAILED;
+ return mem;
+ }
+
+ void *p = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd,
+ 0);
+
+ close(fd);
+
+ if (p == MAP_FAILED) {
+ shm_unlink(mem._name);
+ mem.status = KIT_ERROR_MAP_FAILED;
+ return mem;
+ }
+
+ mem.status = KIT_OK;
+ mem.size = size;
+ mem.bytes = (u8 *) p;
+ mem._owned = (mode == KIT_SHARED_MEMORY_CREATE);
+ return mem;
+}
+
+s32 kit_shared_memory_close(kit_shared_memory_t *mem) {
+ assert(mem != NULL);
+
+ if (mem == NULL)
+ return KIT_ERROR_INVALID_ARGUMENT;
+
+ s32 status = KIT_OK;
+
+ if (munmap(mem->bytes, mem->size) != 0)
+ status |= KIT_ERROR_UNMAP_FAILED;
+ if (mem->_owned && shm_unlink(mem->_name) != 0)
+ status |= KIT_ERROR_UNLINK_FAILED;
+
+ return status;
+}
+
+s32 kit_shared_memory_clean(kit_str_t name) {
+ assert(name.size > 0);
+ assert(name.size + 1 <= NAME_MAX);
+ assert(name.values != NULL);
+
+ if (name.size <= 0)
+ return KIT_ERROR_INVALID_NAME;
+
+ if (name.size + 1 > NAME_MAX)
+ return KIT_ERROR_NAME_TOO_LONG;
+
+ for (i64 i = 0; i < name.size; i++)
+ if (name.values[i] == '/' || name.values[i] == '\\')
+ return KIT_ERROR_INVALID_NAME;
+
+ char buf[NAME_MAX + 1] = "/";
+ memcpy(buf + 1, name.values, name.size);
+ buf[1 + name.size] = '\0';
+
+ if (shm_unlink(buf) != 0)
+ return KIT_ERROR_UNLINK_FAILED;
+
+ return KIT_OK;
+}
+#endif