> For the complete documentation index, see [llms.txt](https://oscourse-tsinghua.gitbook.io/ucore-analysis/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://oscourse-tsinghua.gitbook.io/ucore-analysis/ucore/user/libs/panic_c.md).

# panic.c

```c
#include <defs.h>
#include <stdarg.h>
#include <stdio.h>
#include <ulib.h>
#include <error.h>

void
__panic(const char *file, int line, const char *fmt, ...) {
    // print the 'message'
    va_list ap;
    va_start(ap, fmt);
    cprintf("user panic at %s:%d:\n    ", file, line);
    vcprintf(fmt, ap);
    cprintf("\n");
    va_end(ap);
    exit(-E_PANIC);
}

void
__warn(const char *file, int line, const char *fmt, ...) {
    va_list ap;
    va_start(ap, fmt);
    cprintf("user warning at %s:%d:\n    ", file, line);
    vcprintf(fmt, ap);
    cprintf("\n");
    va_end(ap);
}
```