Miscellaneous compat work while seeing if GNU coreutils would build.

Kernel/Makefile

@@ -59,10 +59,11 @@ WARNING_FLAGS = -Wextra -Wall -Wundef -Wcast-qual -Wwrite-strings
 FLAVOR_FLAGS = -mregparm=3 -march=i386 -m32 -fno-exceptions -fno-rtti -fmerge-all-constants -fno-unroll-loops -fno-pie -fno-pic
 OPTIMIZATION_FLAGS = -Os -fno-asynchronous-unwind-tables
 INCLUDE_FLAGS = -I.. -I.
+SUGGEST_FLAGS = -Wsuggest-attribute=pure -Wsuggest-attribute=const -Wsuggest-attribute=noreturn -Wsuggest-final-types -Wsuggest-final-methods -Wsuggest-override
 
 DEFINES = -DSERENITY -DKERNEL -DSANITIZE_PTRS
 
-CXXFLAGS = $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(KERNEL_FLAGS) $(FLAVOR_FLAGS) $(ARCH_FLAGS) $(STANDARD_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
+CXXFLAGS = $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(KERNEL_FLAGS) $(FLAVOR_FLAGS) $(ARCH_FLAGS) $(STANDARD_FLAGS) $(SUGGEST_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
 #CXX = /usr/local/gcc-4.8.1-for-linux64/bin/x86_64-pc-linux-g++
 #LD = /usr/local/gcc-4.8.1-for-linux64/bin/x86_64-pc-linux-ld
 CXX = g++-8

LibC/Makefile

@@ -25,6 +25,7 @@ LIBC_OBJS = \
  termcap.o \
  setjmp.o \
  stat.o \
+ mntent.o \
  entry.o
 
 OBJS = $(AK_OBJS) $(LIBC_OBJS)

LibC/errno_numbers.h

@@ -37,6 +37,8 @@
  __ERROR(ENAMETOOLONG, "Name too long") \
  __ERROR(ELOOP, "Too many symlinks") \
  __ERROR(EOVERFLOW, "Overflow") \
+ __ERROR(EOPNOTSUPP, "Operation not supported") \
+ __ERROR(ENOSYS, "No such syscall") \
  __ERROR(ENOTIMPL, "Not implemented") \
 
 enum __errno_values {

LibC/limits.h

@@ -1,3 +1,8 @@
 #pragma once
 
+#include <stdint.h>
+
 #define PATH_MAX 4096
+
+#define INT_MAX INT32_MAX
+#define INT_MIN INT32_MIN

LibC/mntent.cpp

@@ -0,0 +1,13 @@
+#include <mntent.h>
+#include <assert.h>
+
+extern "C" {
+
+struct mntent* getmntent(FILE* stream)
+{
+ assert(false);
+ return nullptr;
+}
+
+}
+

LibC/mntent.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include <sys/cdefs.h>
+#include <stdio.h>
+
+__BEGIN_DECLS
+
+#define MOUNTED "/etc/mtab"
+#define MNTTAB "/etc/fstab"
+
+struct mntent {
+ char* mnt_fsname;
+ char* mnt_dir;
+ char* mnt_type;
+ char* mnt_opts;
+ int mnt_freq;
+ int mnt_passno;
+};
+
+struct mntent* getmntent(FILE* stream);
+
+__END_DECLS
+

LibC/stddef.h

@@ -0,0 +1,4 @@
+#pragma once
+
+#include <sys/cdefs.h>
+#include <sys/types.h>

LibC/stdint.h

@@ -12,5 +12,15 @@ typedef signed int int32_t;
 typedef signed short int16_t;
 typedef signed char int8_t;
 
+#define INT8_MIN (-128)
+#define INT16_MIN (-32767-1)
+#define INT32_MIN (-2147483647-1)
+#define INT8_MAX (127)
+#define INT16_MAX (32767)
+#define INT32_MAX (2147483647)
+#define UINT8_MAX (255)
+#define UINT16_MAX (65535)
+#define UINT32_MAX (4294967295U)
+
 __END_DECLS
 

LibC/stdio.cpp

@@ -72,6 +72,8 @@ int fputc(int ch, FILE* stream)
 {
  assert(stream);
  write(stream->fd, &ch, 1);
+ if (stream->eof)
+ return EOF;
  return (byte)ch;
 }
 
@@ -85,10 +87,31 @@ int putchar(int ch)
  return putc(ch, stdout);
 }
 
+int fputs(const char* s, FILE* stream)
+{
+ for (; *s; ++s) {
+ int rc = putc(*s, stream);
+ if (rc == EOF)
+ return EOF;
+ }
+ return putc('\n', stream);
+}
+
+int puts(const char* s)
+{
+ fputs(s, stdout);
+}
+
 void clearerr(FILE* stream)
 {
  assert(stream);
  stream->eof = false;
+ stream->error = false;
+}
+
+int ferror(FILE* stream)
+{
+ return stream->error;
 }
 
 size_t fread(void* ptr, size_t size, size_t nmemb, FILE* stream)
@@ -190,6 +213,7 @@ FILE* fopen(const char* pathname, const char* mode)
  auto* fp = (FILE*)malloc(sizeof(FILE));
  fp->fd = fd;
  fp->eof = false;
+ fp->error = 0;
  return fp;
 }
 
@@ -201,6 +225,7 @@ FILE* fdopen(int fd, const char* mode)
  auto* fp = (FILE*)malloc(sizeof(FILE));
  fp->fd = fd;
  fp->eof = false;
+ fp->error = 0;
  return fp;
 }
 

LibC/stdio.h

@@ -16,6 +16,7 @@ __BEGIN_DECLS
 struct __STDIO_FILE {
  int fd;
  int eof;
+ int error;
 };
 
 typedef struct __STDIO_FILE FILE;
@@ -34,6 +35,7 @@ FILE* fopen(const char* pathname, const char* mode);
 int fclose(FILE*);
 void rewind(FILE*);
 void clearerr(FILE*);
+int ferror(FILE*);
 int feof(FILE*);
 int fflush(FILE*);
 size_t fread(void* ptr, size_t size, size_t nmemb, FILE*);
@@ -42,6 +44,9 @@ int fprintf(FILE*, const char* fmt, ...);
 int printf(const char* fmt, ...);
 int sprintf(char* buffer, const char* fmt, ...);
 int putchar(int ch);
+int putc(int ch, FILE*);
+int puts(const char*);
+int fputs(const char*, FILE*);
 void perror(const char*);
 int sscanf (const char* buf, const char* fmt, ...);
 int fscanf(FILE*, const char* fmt, ...);

LibC/sys/stat.h

@@ -6,5 +6,6 @@
 __BEGIN_DECLS
 
 mode_t umask(mode_t);
+int chmod(const char* pathname, mode_t);
 
 __END_DECLS

LibC/sys/types.h

@@ -22,8 +22,8 @@ typedef uint32_t blksize_t;
 typedef uint32_t blkcnt_t;
 typedef uint32_t time_t;
 typedef uint32_t suseconds_t;
-
 typedef uint32_t clock_t;
+typedef uint32_t socklen_t;
 
 struct timeval {
  time_t tv_sec;