97 lines
2.1 KiB
C
97 lines
2.1 KiB
C
// init.c - first user-mode process
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#include <stdint.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <syscall.h>
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#define STATUS_SUCCESS 0u
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void itoa(int num, char* str) {
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int i = 0;
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int is_negative = 0;
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// Handle 0 explicitly
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if (num == 0) {
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str[i++] = '0';
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str[i] = '\0';
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return;
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}
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// Handle negative numbers
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if (num < 0) {
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is_negative = 1;
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num = -num;
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}
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// Process individual digits (result is in reverse)
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while (num != 0) {
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int rem = num % 10;
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str[i++] = rem + '0';
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num = num / 10;
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}
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if (is_negative) {
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str[i++] = '-';
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}
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str[i] = '\0'; // Null terminate
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// Reverse the string
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int start = 0;
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int end = i - 1;
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while (start < end) {
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char temp = str[start];
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str[start] = str[end];
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str[end] = temp;
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start++;
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end--;
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}
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}
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static void debug_print(const char* s) {
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SYS_DEBUG_PRINT_REQUEST req = { SysSvFromCstr(s) };
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(void)SysDebugPrint(&req);
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}
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void _start(void)
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{
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SYS_STRING_VIEW args = SysGetPeb()->CommandLine;
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uint32_t h = 0;
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uint32_t s = 0;
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while (true) {
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debug_print("[init] starting\n");
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SYS_CREATE_PROCESS_REQUEST cp = { args, SysSvFromParts(0, 0), &h };
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s = SysCreateProcess(&cp);
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if (s != STATUS_SUCCESS) {
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debug_print("[init] FATAL: failed to start!\n");
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char buffer[12];
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itoa(s, buffer);
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debug_print(buffer);
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debug_print("\n");
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SysExitProcess(1);
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}
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debug_print("[init] waiting\n");
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s = SysWaitForProcess(h);
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if (s != STATUS_SUCCESS)
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debug_print("[init] WARNING: SysWaitForProcess returned error\n");
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int exitCode = 0;
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if (SysGetProcessExitCode(h, &exitCode) != STATUS_SUCCESS) {
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debug_print("[init] WARNING: failed to read exit code\n");
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exitCode = 1;
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}
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SysCloseHandle(h);
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if (exitCode == 0)
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break;
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debug_print("[init] child crashed, restarting\n");
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}
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debug_print("[init] done\n");
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SysExitProcess(0);
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}
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