17 files changed, 874 insertions, 0 deletions

diff --git a/lib/mlibc/options/glibc/generic/err.cpp b/lib/mlibc/options/glibc/generic/err.cpp
new file mode 100644
index 0000000..042c1d8
--- /dev/null
+++ b/lib/mlibc/options/glibc/generic/err.cpp
@@ -0,0 +1,64 @@
+#include <err.h>
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+// va_list
+
+void vwarn(const char *fmt, va_list params) {
+	fprintf(stderr, "%s: ", program_invocation_short_name);
+	if (fmt) {
+		vfprintf(stderr, fmt, params);
+                fwrite(": ", 1, 2, stderr);
+	}
+	perror(NULL);
+}
+
+void vwarnx(const char *fmt, va_list params) {
+	fprintf(stderr, "%s: ", program_invocation_short_name);
+	if (fmt) {
+		vfprintf(stderr, fmt, params);
+	}
+	putc('\n', stderr);
+}
+
+__attribute__((__noreturn__)) void verr(int status, const char *fmt, va_list params) {
+	vwarn(fmt, params);
+	exit(status);
+}
+
+__attribute__((__noreturn__)) void verrx(int status, const char *fmt, va_list params) {
+	vwarnx(fmt, params);
+	exit(status);
+}
+
+// variadic
+
+void warn(const char *fmt, ...) {
+	va_list params;
+	va_start(params, fmt);
+	vwarn(fmt, params);
+	va_end(params);
+}
+
+void warnx(const char *fmt, ...) {
+	va_list params;
+	va_start(params, fmt);
+	vwarnx(fmt, params);
+	va_end(params);
+}
+
+__attribute__((__noreturn__)) void err(int status, const char *fmt, ...) {
+	va_list params;
+	va_start(params, fmt);
+	verr(status, fmt, params);
+	va_end(params);
+}
+
+__attribute__((__noreturn__)) void errx(int status, const char *fmt, ...) {
+	va_list params;
+	va_start(params, fmt);
+	verrx(status, fmt, params);
+	va_end(params);
+}
diff --git a/lib/mlibc/options/glibc/generic/error.cpp b/lib/mlibc/options/glibc/generic/error.cpp
new file mode 100644
index 0000000..45203b2
--- /dev/null
+++ b/lib/mlibc/options/glibc/generic/error.cpp
@@ -0,0 +1,65 @@
+#include <stdio.h>
+#include <stdarg.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <error.h>
+
+unsigned int error_message_count = 0;
+int error_one_per_line = 0;
+void (*error_print_progname)(void) = NULL;
+
+void error(int status, int errnum, const char *format, ...) {
+	va_list args;
+	va_start(args, format);
+
+	error_message_count++;
+	
+	fflush(stdout);
+	if(error_print_progname) {
+		error_print_progname();
+	} else {
+		fprintf(stderr, "%s: ", program_invocation_name);
+	}
+	vfprintf(stderr, format, args);
+	va_end(args);
+
+	if(errnum) {
+		fprintf(stderr, ": %s\n", strerror(errnum));
+	}
+
+	if(status) {
+		exit(status);
+	}
+}
+
+void error_at_line(int status, int errnum, const char *filename, unsigned int linenum, const char *format, ...) {
+	va_list args;
+	va_start(args, format);
+
+	static bool first_call = true;
+	static unsigned int last_line = 0;
+	if(!(last_line == linenum && error_one_per_line && !first_call)) {
+		first_call = false;
+		last_line = linenum;
+		error_message_count++;
+
+		fflush(stdout);
+		if(error_print_progname) {
+			error_print_progname();
+		} else {
+			fprintf(stderr, "%s:", program_invocation_name);
+		}
+		fprintf(stderr, "%s:%u: ", filename, linenum);
+		vfprintf(stderr, format, args);
+
+		if(errnum) {
+			fprintf(stderr, ": %s\n", strerror(errnum));
+		}
+	}
+	va_end(args);
+
+	if(status) {
+		exit(status);
+	}
+}
diff --git a/lib/mlibc/options/glibc/generic/execinfo.cpp b/lib/mlibc/options/glibc/generic/execinfo.cpp
new file mode 100644
index 0000000..3474615
--- /dev/null
+++ b/lib/mlibc/options/glibc/generic/execinfo.cpp
@@ -0,0 +1,17 @@
+#include <execinfo.h>
+#include <bits/ensure.h>
+
+int backtrace(void **, int) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+
+char **backtrace_symbols(void *const *, int) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+
+void backtrace_symbols_fd(void *const *, int, int) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
diff --git a/lib/mlibc/options/glibc/generic/getopt-stubs.cpp b/lib/mlibc/options/glibc/generic/getopt-stubs.cpp
new file mode 100644
index 0000000..d13d4eb
--- /dev/null
+++ b/lib/mlibc/options/glibc/generic/getopt-stubs.cpp
@@ -0,0 +1,253 @@
+#include <assert.h>
+#include <bits/ensure.h>
+#include <getopt.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <frg/optional.hpp>
+#include <mlibc/debug.hpp>
+
+char *optarg;
+int optind = 1;
+int opterr = 1;
+int optopt;
+
+namespace {
+
+int __optpos = 1;
+
+enum GetoptMode {
+	Short,
+	Long,
+	LongOnly,
+};
+
+int getopt_common(int argc, char * const argv[], const char *optstring, const struct option *longopts, int *longindex, enum GetoptMode mode) {
+	auto longopt_consume = [&](const char *arg, char *s, int k, bool colon) -> frg::optional<int> {
+		// Consume the option and its argument.
+		if(longopts[k].has_arg == required_argument) {
+			if(s) {
+				// Consume the long option and its argument.
+				optarg = s + 1;
+				optind++;
+			}else if(argv[optind + 1]) {
+				// Consume the long option.
+				optind++;
+
+				// Consume the option's argument.
+				optarg = argv[optind];
+				optind++;
+			}else{
+				/*	If an error was detected, and the first character of optstring is not a colon,
+					and the external variable opterr is nonzero (which is the default),
+					getopt() prints an error message. */
+				if(!colon && opterr)
+					fprintf(stderr, "--%s requires an argument.\n", arg);
+				/*	If the first character of optstring is a colon (':'), then getopt()
+					returns ':' instead of '?' to indicate a missing option argument. */
+				return colon ? ':' : '?';
+			}
+		}else if(longopts[k].has_arg == optional_argument) {
+			if(s) {
+				// Consume the long option and its argument.
+				optarg = s + 1;
+				optind++;
+			}else{
+				// Consume the long option.
+				optarg = nullptr;
+				optind++;
+			}
+		}else{
+			__ensure(longopts[k].has_arg == no_argument);
+
+			// Consume the long option.
+			optind++;
+		}
+
+		return frg::null_opt;
+	};
+
+	bool colon = optstring[0] == ':';
+	bool stop_at_first_nonarg = (optstring[0] == '+' || getenv("POSIXLY_CORRECT"));
+
+	// glibc extension: Setting optind to zero causes a full reset.
+	// TODO: Should we really reset opterr and the other flags?
+	if(!optind
+#if __MLIBC_BSD_OPTION
+		|| optreset
+#endif //__MLIBC_BSD_OPTION
+		) {
+		optarg = nullptr;
+		optind = 1;
+		opterr = 1;
+		optopt = 0;
+		__optpos = 1;
+#if __MLIBC_BSD_OPTION
+		optreset = 0;
+#endif //__MLIBC_BSD_OPTION
+	}
+
+	auto isOptionArg = [](char *arg){
+		// If the first character of arg '-', and the arg is not exactly
+		// equal to "-" or "--", then the arg is an option argument.
+		return arg[0] == '-' && strcmp(arg, "-") && strcmp(arg, "--");
+	};
+
+	while(optind < argc) {
+		char *arg = argv[optind];
+		if(!isOptionArg(arg)) {
+			if(stop_at_first_nonarg) {
+				return -1;
+			}
+
+			bool further_options = false;
+			int skip = optind;
+
+			for(; skip < argc; ++skip) {
+				if(isOptionArg(argv[skip])) {
+					further_options = true;
+					break;
+				}
+			}
+
+			if(further_options) {
+				optind += skip - optind;
+				continue;
+			} else {
+				optarg = nullptr;
+				return -1;
+			}
+		}
+
+		if(arg[1] == '-') {
+			arg += 2;
+
+			// Determine the end of the option name (vs. the start of the argument).
+			auto s = strchr(arg, '=');
+			size_t n = s ? (s - arg) : strlen(arg);
+
+			int k = -1;
+			for(int i = 0; longopts[i].name; i++) {
+				if(strncmp(arg, longopts[i].name, n) || longopts[i].name[n])
+					continue;
+
+				if(k >= 0) {
+					if(opterr)
+						fprintf(stderr, "Multiple option declaration detected: %s\n", arg);
+					return '?';
+				}
+				k = i;
+			}
+
+			if(k == -1) {
+				if(opterr)
+					fprintf(stderr, "--%s is not a valid option.\n", arg);
+				return '?';
+			}
+
+			if(longindex)
+				*longindex = k;
+
+			if(auto r = longopt_consume(arg, s, k, colon); r)
+				return r.value();
+
+			if(!longopts[k].flag) {
+				return longopts[k].val;
+			}else{
+				*longopts[k].flag = longopts[k].val;
+				return 0;
+			}
+		}else{
+			/* handle short options, i.e. options with only one dash prefixed; e.g. `program -s` */
+			unsigned int i = __optpos;
+			while(true) {
+				if(mode == GetoptMode::LongOnly) {
+					const char *lo_arg = &arg[1];
+					auto s = strchr(lo_arg, '=');
+					size_t n = s ? (s - lo_arg) : strlen(lo_arg);
+					int k = -1;
+
+					for(int longopt = 0; longopts[longopt].name; longopt++) {
+						if(strncmp(lo_arg, longopts[longopt].name, n) || longopts[longopt].name[n])
+							continue;
+
+						if(k >= 0) {
+							if(opterr)
+								fprintf(stderr, "Multiple option declaration detected: %s\n", arg);
+							return '?';
+						}
+
+						k = longopt;
+					}
+
+					if(k != -1) {
+						if(auto r = longopt_consume(lo_arg, s, k, colon); r)
+							return r.value();
+
+						if(!longopts[k].flag) {
+							return longopts[k].val;
+						}else{
+							*longopts[k].flag = longopts[k].val;
+							return 0;
+						}
+					}
+				}
+
+				auto opt = strchr(optstring, arg[i]);
+				if(opt) {
+					if(opt[1] == ':') {
+						bool required = (opt[2] != ':');
+
+						if(arg[i+1]) {
+							optarg = arg + i + 1;
+						} else if(optind + 1 < argc && argv[optind + 1] && (required || argv[optind + 1][0] != '-')) {
+							/* there is an argument to this short option, separated by a space */
+							optarg = argv[optind + 1];
+							optind++;
+							__optpos = 1;
+						} else if(!required) {
+							optarg = nullptr;
+						} else {
+							__optpos = 1;
+							optopt = arg[i];
+							return colon ? ':' : '?';
+						}
+						optind++;
+					} else {
+						if(arg[i+1]) {
+							__optpos++;
+						} else if(arg[i]) {
+							optind++;
+						} else {
+							return -1;
+						}
+					}
+
+					return arg[i];
+				} else {
+					/*	If getopt() does not recognize an option character, it prints an error message to stderr,
+						stores the character in optopt, and returns '?'. The calling program may prevent
+						the error message by setting opterr to 0. */
+					optopt = arg[1];
+					if(opterr)
+						fprintf(stderr, "%s is not a valid option.\n", arg);
+					return '?';
+				}
+			}
+		}
+	}
+	return -1;
+}
+
+}
+
+int getopt_long(int argc, char * const argv[], const char *optstring,
+		const struct option *longopts, int *longindex) {
+	return getopt_common(argc, argv, optstring, longopts, longindex, GetoptMode::Long);
+}
+
+int getopt_long_only(int argc, char * const argv[], const char *optstring,
+		const struct option *longopts, int *longindex) {
+	return getopt_common(argc, argv, optstring, longopts, longindex, GetoptMode::LongOnly);
+}
diff --git a/lib/mlibc/options/glibc/generic/glibc-assert.cpp b/lib/mlibc/options/glibc/generic/glibc-assert.cpp
new file mode 100644
index 0000000..77cd498
--- /dev/null
+++ b/lib/mlibc/options/glibc/generic/glibc-assert.cpp
@@ -0,0 +1,14 @@
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <bits/ensure.h>
+
+[[gnu::noreturn]] void __assert_fail_perror(int errno, const char *file, unsigned int line,
+		const char *function) {
+	char *errormsg = strerror(errno);
+	fprintf(stderr, "In function %s, file %s:%d: Errno '%s' failed!\n",
+			function, file, line, errormsg);
+	abort();
+}
diff --git a/lib/mlibc/options/glibc/generic/glibc-signal.cpp b/lib/mlibc/options/glibc/generic/glibc-signal.cpp
new file mode 100644
index 0000000..41bc455
--- /dev/null
+++ b/lib/mlibc/options/glibc/generic/glibc-signal.cpp
@@ -0,0 +1,14 @@
+#include <errno.h>
+#include <signal.h>
+#include <bits/ensure.h>
+#include <mlibc/debug.hpp>
+#include <mlibc/glibc-sysdeps.hpp>
+
+int tgkill(int tgid, int tid, int sig) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_tgkill, -1);
+	if(int e = mlibc::sys_tgkill(tgid, tid, sig); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
diff --git a/lib/mlibc/options/glibc/generic/gshadow.cpp b/lib/mlibc/options/glibc/generic/gshadow.cpp
new file mode 100644
index 0000000..f93a47d
--- /dev/null
+++ b/lib/mlibc/options/glibc/generic/gshadow.cpp
@@ -0,0 +1,7 @@
+#include <gshadow.h>
+#include <bits/ensure.h>
+
+int getsgnam_r(const char *, struct sgrp *, char *, size_t, struct sgrp **) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
diff --git a/lib/mlibc/options/glibc/generic/malloc.cpp b/lib/mlibc/options/glibc/generic/malloc.cpp
new file mode 100644
index 0000000..b5a4daf
--- /dev/null
+++ b/lib/mlibc/options/glibc/generic/malloc.cpp
@@ -0,0 +1,6 @@
+#include <bits/glibc/glibc_malloc.h>
+#include <mlibc/allocator.hpp>
+
+size_t malloc_usable_size(void *p) {
+	return getAllocator().get_size(p);
+}
diff --git a/lib/mlibc/options/glibc/generic/personality.cpp b/lib/mlibc/options/glibc/generic/personality.cpp
new file mode 100644
index 0000000..3bfd9aa
--- /dev/null
+++ b/lib/mlibc/options/glibc/generic/personality.cpp
@@ -0,0 +1,15 @@
+#include <bits/ensure.h>
+#include <errno.h>
+#include <mlibc/glibc-sysdeps.hpp>
+#include <sys/personality.h>
+
+int personality(unsigned long persona) {
+	int out = 0;
+	auto sysdep = MLIBC_CHECK_OR_ENOSYS(mlibc::sys_personality, -1);
+
+	if(int e = sysdep(persona, &out); e) {
+		errno = e;
+		return -1;
+	}
+	return out;
+}
diff --git a/lib/mlibc/options/glibc/generic/printf.cpp b/lib/mlibc/options/glibc/generic/printf.cpp
new file mode 100644
index 0000000..4abb00d
--- /dev/null
+++ b/lib/mlibc/options/glibc/generic/printf.cpp
@@ -0,0 +1,7 @@
+#include <bits/ensure.h>
+#include <printf.h>
+
+size_t parse_printf_format(const char * __restrict, size_t, int * __restrict) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
diff --git a/lib/mlibc/options/glibc/generic/resolv-stubs.cpp b/lib/mlibc/options/glibc/generic/resolv-stubs.cpp
new file mode 100644
index 0000000..7c0723e
--- /dev/null
+++ b/lib/mlibc/options/glibc/generic/resolv-stubs.cpp
@@ -0,0 +1,36 @@
+#include <resolv.h>
+#include <bits/ensure.h>
+#include <mlibc/debug.hpp>
+
+int dn_expand(const unsigned char *, const unsigned char *,
+		const unsigned char *, char *, int) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+
+int res_query(const char *, int, int, unsigned char *, int) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();	
+}
+
+int res_init() {
+	mlibc::infoLogger() << "mlibc: res_init is a stub!" << frg::endlog;
+	return 0;
+}
+
+int res_ninit(res_state) {
+	mlibc::infoLogger() << "mlibc: res_ninit is a stub!" << frg::endlog;
+	return 0;
+}
+
+void res_nclose(res_state) {
+	mlibc::infoLogger() << "mlibc: res_nclose is a stub!" << frg::endlog;
+	return;
+}
+
+/* This is completely unused, and exists purely to satisfy broken apps. */
+
+struct __res_state *__res_state() {
+	static struct __res_state res;
+	return &res;
+}
diff --git a/lib/mlibc/options/glibc/generic/shadow-stubs.cpp b/lib/mlibc/options/glibc/generic/shadow-stubs.cpp
new file mode 100644
index 0000000..9ce6584
--- /dev/null
+++ b/lib/mlibc/options/glibc/generic/shadow-stubs.cpp
@@ -0,0 +1,217 @@
+#include <shadow.h>
+#include <errno.h>
+#include <limits.h>
+#include <pthread.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/stat.h>
+
+#include <bits/ensure.h>
+#include <mlibc/debug.hpp>
+
+/*
+ * The code in this file is largely based on or taken from musl.
+ * This includes:
+ * - xatol
+ * - __parsespent
+ * - cleanup
+ * - getspnam_r
+ * - getspnam
+ */
+#define NUM(n) ((n) == -1 ? 0 : -1), ((n) == -1 ? 0 : (n))
+
+int putspent(const struct spwd *sp, FILE *f) {
+	auto str = [] (char *s) {
+		return ((s) ? (s) : "");
+	};
+	return fprintf(f, "%s:%s:%.*d:%.*d:%.*d:%.*d:%.*d:%.*d:%.*u\n",
+		str(sp->sp_namp), str(sp->sp_pwdp), NUM(sp->sp_lstchg),
+		NUM(sp->sp_min), NUM(sp->sp_max), NUM(sp->sp_warn),
+		NUM(sp->sp_inact), NUM(sp->sp_expire), NUM((int)sp->sp_flag)) < 0 ? -1 : 0;
+}
+#undef NUM
+
+static long xatol(char **s) {
+	long x;
+	if(**s == ':' || **s == '\n') {
+		return -1;
+	}
+	for(x = 0; (unsigned int)**s - '0' < 10U; ++*s) {
+		x = 10 * x + (**s - '0');
+	}
+	return x;
+}
+
+static int __parsespent(char *s, struct spwd *sp) {
+	sp->sp_namp = s;
+	if(!(s = strchr(s, ':'))) {
+		return -1;
+	}
+	*s = 0;
+
+	sp->sp_pwdp = ++s;
+	if(!(s = strchr(s, ':'))) {
+		return -1;
+	}
+	*s = 0;
+
+	s++;
+	sp->sp_lstchg = xatol(&s);
+	if(*s != ':') {
+		return -1;
+	}
+
+	s++;
+	sp->sp_min = xatol(&s);
+	if(*s != ':') {
+		return -1;
+	}
+
+	s++;
+	sp->sp_max = xatol(&s);
+	if(*s != ':') {
+		return -1;
+	}
+
+	s++;
+	sp->sp_warn = xatol(&s);
+	if(*s != ':') {
+		return -1;
+	}
+
+	s++;
+	sp->sp_inact = xatol(&s);
+	if(*s != ':') {
+		return -1;
+	}
+
+	s++;
+	sp->sp_expire = xatol(&s);
+	if(*s != ':') {
+		return -1;
+	}
+
+	s++;
+	sp->sp_flag = xatol(&s);
+	if(*s != '\n') {
+		return -1;
+	}
+	return 0;
+}
+
+static void cleanup(void *p) {
+	fclose((FILE *)p);
+}
+
+int getspnam_r(const char *name, struct spwd *sp, char *buf, size_t size, struct spwd **res) {
+	char path[20 + NAME_MAX];
+	FILE *f = 0;
+	int rv = 0;
+	int fd;
+	size_t k, l = strlen(name);
+	int skip = 0;
+	int cs;
+	int orig_errno = errno;
+
+	*res = 0;
+
+	/* Disallow potentially-malicious user names */
+	if(*name=='.' || strchr(name, '/') || !l) {
+		return errno = EINVAL;
+	}
+
+	/* Buffer size must at least be able to hold name, plus some.. */
+	if(size < l + 100) {
+		return errno = ERANGE;
+	}
+
+	/* Protect against truncation */
+	if(snprintf(path, sizeof path, "/etc/tcb/%s/shadow", name) >= (int)sizeof path) {
+		return errno = EINVAL;
+	}
+
+	fd = open(path, O_RDONLY|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC);
+	if(fd >= 0) {
+		struct stat st = {};
+		errno = EINVAL;
+		if(fstat(fd, &st) || !S_ISREG(st.st_mode) || !(f = fdopen(fd, "rb"))) {
+			pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
+			close(fd);
+			pthread_setcancelstate(cs, 0);
+			return errno;
+		}
+	} else {
+		if(errno != ENOENT && errno != ENOTDIR) {
+			return errno;
+		}
+		f = fopen("/etc/shadow", "rbe");
+		if(!f) {
+			if(errno != ENOENT && errno != ENOTDIR) {
+				return errno;
+			}
+			return 0;
+		}
+	}
+
+	pthread_cleanup_push(cleanup, f);
+	while(fgets(buf, size, f) && (k = strlen(buf)) > 0) {
+		if(skip || strncmp(name, buf, l) || buf[l] != ':') {
+			skip = buf[k - 1] != '\n';
+			continue;
+		}
+		if(buf[k - 1] != '\n') {
+			rv = ERANGE;
+			break;
+		}
+
+		if(__parsespent(buf, sp) < 0) {
+			continue;
+		}
+		*res = sp;
+		break;
+	}
+	pthread_cleanup_pop(1);
+	errno = rv ? rv : orig_errno;
+	return rv;
+}
+
+int lckpwdf(void) {
+	mlibc::infoLogger() << "mlibc: lckpwdf is unimplemented like musl" << frg::endlog;
+	return 0;
+}
+
+int ulckpwdf(void) {
+	mlibc::infoLogger() << "mlibc: ulckpwdf is unimplemented like musl" << frg::endlog;
+	return 0;
+}
+
+// Musl defines LINE_LIM to 256
+#define LINE_LIM 256
+
+struct spwd *getspnam(const char *name) {
+	static struct spwd sp;
+	static char *line;
+	struct spwd *res;
+	int e;
+	int orig_errno = errno;
+
+	if(!line) {
+		line = (char *)malloc(LINE_LIM);
+	}
+	if(!line) {
+		return 0;
+	}
+	e = getspnam_r(name, &sp, line, LINE_LIM, &res);
+	errno = e ? e : orig_errno;
+	return res;
+}
+
+struct spwd *fgetspent(FILE *) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+
+void endspent(void) {
+	mlibc::infoLogger() << "mlibc: endspent is a stub" << frg::endlog;
+}
diff --git a/lib/mlibc/options/glibc/generic/stdio_ext-stubs.cpp b/lib/mlibc/options/glibc/generic/stdio_ext-stubs.cpp
new file mode 100644
index 0000000..b9b61fc
--- /dev/null
+++ b/lib/mlibc/options/glibc/generic/stdio_ext-stubs.cpp
@@ -0,0 +1,64 @@
+
+#include <stdio_ext.h>
+#include <bits/ensure.h>
+#include <mlibc/debug.hpp>
+
+size_t __fbufsize(FILE *) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+
+size_t __fpending(FILE *file_base) {
+	__ensure(file_base->__dirty_end >= file_base->__dirty_begin);
+	return file_base->__dirty_end - file_base->__dirty_begin;
+}
+
+int __flbf(FILE *) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+int __freadable(FILE *) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+int __fwritable(FILE *) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+
+int __freading(FILE *file_base) {
+	return file_base->__io_mode == 0;
+}
+
+int __fwriting(FILE *file_base) {
+	return file_base->__io_mode == 1;
+}
+
+int __fsetlocking(FILE *, int) {
+	mlibc::infoLogger() << "mlibc: __fsetlocking() is a no-op" << frg::endlog;
+	return FSETLOCKING_INTERNAL;
+}
+
+void _flushlbf(void) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+
+// The following functions are defined by musl.
+
+size_t __freadahead(FILE *file_base) {
+	if(file_base->__io_mode != 0) {
+		mlibc::infoLogger() << "mlibc: __freadahead() called but file is not open for reading" << frg::endlog;
+		return 0;
+	}
+	return file_base->__valid_limit - file_base->__offset;
+}
+const char *__freadptr(FILE *, size_t *) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+void __fseterr(FILE *) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+
diff --git a/lib/mlibc/options/glibc/generic/string.cpp b/lib/mlibc/options/glibc/generic/string.cpp
new file mode 100644
index 0000000..19f77c7
--- /dev/null
+++ b/lib/mlibc/options/glibc/generic/string.cpp
@@ -0,0 +1,32 @@
+#ifndef _GNU_SOURCE
+# define _GNU_SOURCE
+#endif
+#include <type_traits>
+#include <string.h>
+
+/* This is a bit of a weird detail of the GNU implementation and C's lack of
+ * overloading and strictness: GNU takes const char * and returns a char * so
+ * that it autocasts to your desired constness, this function never actually
+ * modifies the string.
+ */
+char *__mlibc_gnu_basename_c(const char *path) {
+	char *basename_component = strrchr(path, '/');
+	if (!basename_component) {
+		return const_cast<char *>(path);
+	}
+	return basename_component + 1;
+}
+
+
+/* GNU exposes these overloads, and as a result, we should probably have them
+ * checked, to make sure we actually match expectations.
+ */
+static_assert(
+	std::is_same_v<decltype(basename((const char *)nullptr)), const char*>,
+	"C++ overloads broken"
+);
+
+static_assert(
+	std::is_same_v<decltype(basename((char *)nullptr)), char*>,
+	"C++ overloads broken"
+);
diff --git a/lib/mlibc/options/glibc/generic/sys-io.cpp b/lib/mlibc/options/glibc/generic/sys-io.cpp
new file mode 100644
index 0000000..fbd9070
--- /dev/null
+++ b/lib/mlibc/options/glibc/generic/sys-io.cpp
@@ -0,0 +1,25 @@
+#include <errno.h>
+#include <sys/io.h>
+
+#include <bits/ensure.h>
+#include <mlibc/glibc-sysdeps.hpp>
+
+int ioperm(unsigned long int from, unsigned long int num, int turn_on) {
+	auto sysdep = MLIBC_CHECK_OR_ENOSYS(mlibc::sys_ioperm, -1);
+
+	if(int e = sysdep(from, num, turn_on); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+int iopl(int level) {
+	auto sysdep = MLIBC_CHECK_OR_ENOSYS(mlibc::sys_iopl, -1);
+
+	if(int e = sysdep(level); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
diff --git a/lib/mlibc/options/glibc/generic/sys-ioctl.cpp b/lib/mlibc/options/glibc/generic/sys-ioctl.cpp
new file mode 100644
index 0000000..021d2a3
--- /dev/null
+++ b/lib/mlibc/options/glibc/generic/sys-ioctl.cpp
@@ -0,0 +1,21 @@
+
+#include <errno.h>
+#include <sys/ioctl.h>
+
+#include <bits/ensure.h>
+#include <mlibc/debug.hpp>
+#include <mlibc/glibc-sysdeps.hpp>
+
+int ioctl(int fd, unsigned long request, ...) {
+	va_list args;
+	va_start(args, request);
+	int result;
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_ioctl, -1);
+	void *arg = va_arg(args, void *);
+	if(int e = mlibc::sys_ioctl(fd, request, arg, &result); e) {
+		errno = e;
+		return -1;
+	}
+	return result;
+}
+
diff --git a/lib/mlibc/options/glibc/generic/sys-timex.cpp b/lib/mlibc/options/glibc/generic/sys-timex.cpp
new file mode 100644
index 0000000..6173399
--- /dev/null
+++ b/lib/mlibc/options/glibc/generic/sys-timex.cpp
@@ -0,0 +1,17 @@
+#include <bits/ensure.h>
+#include <sys/timex.h>
+
+int adjtimex(struct timex *) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+
+int clock_adjtime(clockid_t, struct timex *) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+
+int ntp_adjtime(struct timex *) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}