mirror of https://github.com/flysand7/ciabatta.git
121 lines
3.7 KiB
C
121 lines
3.7 KiB
C
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// See src/tinyrt.h file for the interface this file implements
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_Noreturn static void _rt_program_exit(int code) {
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sys_exit(code);
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}
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static _RT_Status _rt_file_std_handles_init() {
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_rt_file_stdin.fd = 0;
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_rt_file_stdin.flags = _RT_FILE_READ;
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_rt_file_stdout.fd = 1;
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_rt_file_stdout.flags = _RT_FILE_WRITE;
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_rt_file_stderr.fd = 2;
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_rt_file_stdout.flags = _RT_FILE_WRITE;
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return _RT_STATUS_OK;
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}
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static _RT_Status _rt_file_open(_RT_File *file, char const *name, int _rt_flags) {
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if((_rt_flags & 0x3) == 0) {
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return _RT_ERROR_BAD_PARAM;
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}
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int mode = 0;
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int flags = 0;
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if((_rt_flags & 0x03) == 0x03) mode = O_RDWR;
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else if(_rt_flags & _RT_FILE_READ) mode = O_RDONLY;
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else if(_rt_flags & _RT_FILE_WRITE) mode = O_RDWR;
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if(_rt_flags & _RT_FILE_CREATE) flags |= O_CREAT;
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if(_rt_flags & _RT_FILE_EXCLUSIVE) flags |= O_EXCL;
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if(_rt_flags & _RT_FILE_TRUNCATE) flags |= O_TRUNC;
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i64 fd = sys_open(name, flags, mode);
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if(-fd == EACCES) return _RT_STATUS_FILE_ACCESS;
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if(-fd == EEXIST) return _RT_STATUS_FILE_EXISTS;
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if(-fd == ENOENT) return _RT_STATUS_FILE_NOT_EXISTS;
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if(-fd == EINVAL) return _RT_ERROR_BAD_PARAM;
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if(-fd == EISDIR) return _RT_STATUS_FILE_DIRECTORY;
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// I'm too lazy to fill in the rest so lets leave it at that for now
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if(fd < 0) return _RT_STATUS_FILE_IO_ERROR;
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file->fd = (u64)fd;
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file->flags = _rt_flags;
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return _RT_STATUS_OK;
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}
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static _RT_Status _rt_file_read(u64 size, void *buffer, _RT_File *from, u64 *out_bytes_read) {
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i64 bytes_read = sys_read(from->fd, buffer, size);
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if(bytes_read == 0) {
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return _RT_STATUS_FILE_EOF;
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}
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if(bytes_read < 0) {
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return _RT_STATUS_FILE_IO_ERROR;
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}
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*out_bytes_read = bytes_read;
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return _RT_STATUS_OK;
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}
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static _RT_Status _rt_file_write(_RT_File *to, u64 size, void *buffer, u64 *out_bytes_written) {
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i64 status = sys_write(to->fd, buffer, size);
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if(-status == EBADF) return _RT_ERROR_BAD_PARAM;
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if(-status == EIO) return _RT_STATUS_FILE_IO_ERROR;
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if(-status > 0) return _RT_STATUS_FILE_IO_ERROR;
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*out_bytes_written = status;
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return _RT_STATUS_OK;
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}
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static _RT_Status _rt_file_close(_RT_File *file) {
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i64 result = sys_close(file->fd);
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if(result < 0) {
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return _RT_STATUS_FILE_IO_ERROR;
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}
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return _RT_STATUS_OK;
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}
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static _RT_Status _rt_mem_alloc(void *optional_desired_addr, u64 size, void **out_addr) {
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void *addr = sys_mmap((u64)optional_desired_addr, size, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
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if(addr == NULL) {
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return _RT_ERROR_GENERIC;
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}
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*out_addr = addr;
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return _RT_STATUS_OK;
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}
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static _RT_Status _rt_mem_free(void *ptr, u64 len) {
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i64 result = sys_munmap(ptr, len);
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if(result == -1) {
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return _RT_ERROR_GENERIC;
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}
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return _RT_STATUS_OK;
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}
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static _RT_Status _rt_sync_wait(u32 *addr, u32 compare_with, u64 sleep) {
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i64 result = syscall(SYS_futex, addr, FUTEX_WAIT_PRIVATE, compare_with, NULL, 0, 0);
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if(-result == EAGAIN) {
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return _RT_STATUS_OK;
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}
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else if(-result > 0) {
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return _RT_ERROR_GENERIC;
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}
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return _RT_STATUS_OK;
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}
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static _RT_Status _rt_sync_wake_one(u32 *addr, u32 *n_woken) {
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i64 result = syscall(SYS_futex, addr, FUTEX_WAKE_PRIVATE, 1, NULL, 0, 0);
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if(result < 0) {
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return _RT_ERROR_GENERIC;
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}
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if(n_woken != NULL) {
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*n_woken = (u32)result;
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}
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return _RT_STATUS_OK;
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}
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static _RT_Status _rt_sync_wake_all(u32 *addr, u32 *n_woken) {
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i64 result = syscall(SYS_futex, addr, FUTEX_WAKE_PRIVATE, 0x7fffffff, NULL, 0, 0);
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if(result < 0) {
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return _RT_ERROR_GENERIC;
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}
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if(n_woken != NULL) {
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*n_woken = (u32)result;
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}
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return _RT_STATUS_OK;
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}
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