unikraft-zig-native-hello/undefined.c

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#include <stdio.h>
/* Linking our zig to libc results in the following undefined symbols:
mmap64
dl_iterate_phdr
getcontext
sigaction
write
close
realpath
read
msync
munmap
environ
openat64
flock
fstat64
dl_iterate_phdr
getenv
isatty
*/
// Provide stubs for missing functions
#define UNUSED(x) (void)(x)
#define SEGFAULT() {int *ptr = 0; *ptr = 42;}
void *mmap64(void *addr, size_t length, int prot, int flags,
int fd, long int offset){
UNUSED(addr);
UNUSED(length);
UNUSED(prot);
UNUSED(flags);
UNUSED(flags);
UNUSED(fd);
UNUSED(offset);
puts("unsupported function mmap called");
// force a seg fault
SEGFAULT();
return 0; // unreachable
}
int dl_iterate_phdr(
int (*callback)(struct dl_phdr_info *info,
size_t size, void *data),
void *data){
UNUSED(callback);
UNUSED(data);
puts("unsupported function dl_iterate_phdr called");
SEGFAULT();
return 0;
}
int getcontext(void *ucp) {
UNUSED(ucp);
puts("unsupported function getcontext called");
SEGFAULT();
return 0;
}
int sigaction(int signum, void* act, void* oldact) {
UNUSED(signum);
UNUSED(act);
UNUSED(oldact);
// const struct sigaction *_Nullable restrict act,
// struct sigaction *_Nullable restrict oldact) {
puts("unsupported function sigaction called");
SEGFAULT();
return 0;
}
#define ANSI_COLOR_RED "\x1b[31m"
#define ANSI_COLOR_GREEN "\x1b[32m"
#define ANSI_COLOR_YELLOW "\x1b[33m"
#define ANSI_COLOR_BLUE "\x1b[34m"
#define ANSI_COLOR_MAGENTA "\x1b[35m"
#define ANSI_COLOR_CYAN "\x1b[36m"
#define ANSI_COLOR_RESET "\x1b[0m"
// TODO: This if is not correct
#if !(defined(CONFIG_LIBPOSIX_TTY) || defined(CONFIG_LIBSYSCALL_SHIM))
size_t write(int fd, const char *buf, size_t count){
UNUSED(fd);
UNUSED(buf);
UNUSED(count);
char *color;
switch (fd) {
case 1: // stdout
color = ANSI_COLOR_RESET;
break;
case 2:
color = ANSI_COLOR_RED;
break;
default:
printf("write called on unsupported file descriptor: ");
char fd_buf[10] = "fd = ";
fd_buf[5] = '0' + fd;
fd_buf[6] = 0;
puts(fd_buf);
SEGFAULT();
break;
}
if (fd != 1) printf(color);
if (fd == 2) printf("(stderr): ");
printf("%.*s", (int)count, buf);
if (fd != 1) printf(ANSI_COLOR_RESET);
return count;
}
int close(int fd) {
UNUSED(fd);
// const struct sigaction *_Nullable restrict act,
// struct sigaction *_Nullable restrict oldact) {
puts("unsupported function close called");
SEGFAULT();
return 0;
}
size_t read(int fd, void *buf, size_t count) {
UNUSED(fd);
UNUSED(buf);
UNUSED(count);
puts("unsupported function read called");
SEGFAULT();
return 0;
}
#endif
char *realpath(const char *path,
char *resolved_path) {
UNUSED(path);
UNUSED(resolved_path);
// const struct sigaction *_Nullable restrict act,
// struct sigaction *_Nullable restrict oldact) {
puts("unsupported function realpath called");
SEGFAULT();
return 0;
}
int msync(void *addr, size_t length, int flags) {
UNUSED(addr);
UNUSED(length);
UNUSED(flags);
puts("unsupported function msync called");
SEGFAULT();
return 0;
}
int munmap(void *addr, size_t length) {
UNUSED(addr);
UNUSED(length);
puts("unsupported function munmap called");
SEGFAULT();
return 0;
}
int openat64(int fd, const char * path, int oflag, ...) {
UNUSED(fd);
UNUSED(path);
UNUSED(oflag);
puts("unsupported function openat64 called");
SEGFAULT();
return 0;
}
int flock(int fd, int operation) {
UNUSED(fd);
UNUSED(operation);
puts("unsupported function flock called");
SEGFAULT();
return 0;
}
int fstat64(int fd, void *statbuf) {
UNUSED(fd);
UNUSED(statbuf);
puts("unsupported function fstat called");
SEGFAULT();
return 0;
}
// If .config... file has environment support (CONFIG_LIBPOSIX_ENVIRON=y)
// defined, these variable are handled
#ifndef CONFIG_LIBPOSIX_ENVIRON
char **environ = 0;
char *getenv(const char *name) {
UNUSED(name);
puts(ANSI_COLOR_RED);
puts("unsupported function getenv called. use `kraft menu` to configure environment variable support");
puts("or set CONFIG_LIBPOSIX_ENVIRON in .config.<appname>_<system>-<architecture>");
puts(ANSI_COLOR_RESET);
SEGFAULT();
return 0;
}
#endif
int isatty(int fd) {
UNUSED(fd);
puts("unsupported function isatty called");
SEGFAULT();
return 0;
}