From 30740ca4131d1f574718262451b4410207dc8d4e Mon Sep 17 00:00:00 2001
From: Mitya Selivanov <automainint@guattari.tech>
Date: Sun, 14 Jul 2024 21:12:37 +0200
Subject: Reworking the build system

---
 kit/shared_memory.posix.c | 124 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 124 insertions(+)
 create mode 100644 kit/shared_memory.posix.c

(limited to 'kit/shared_memory.posix.c')

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
-- 
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