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#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;
}
kit_status_t kit_shared_memory_close(kit_shared_memory_t *mem) {
assert(mem != NULL);
if (mem == NULL)
return KIT_ERROR_INVALID_ARGUMENT;
kit_status_t 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;
}
kit_status_t 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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