Create a basic and probably wrong common unistd.h, which replaces the plat one.

Made this work with cpm (but nothing else yet).

build.lua

@@ -7,23 +7,23 @@ vars.ackcflags = {
 vars.ackldflags = {}
 vars.plats = {
 	"cpm",
-	"linux386",
-	"linux68k",
-	"linuxppc",
-	"osx386",
-	"osxppc",
-	--"qemuppc",
-	"pc86",
-	"rpi",
-	"pdpv7",
-	"em22",
+--	"linux386",
+--	"linux68k",
+--	"linuxppc",
+--	"osx386",
+--	"osxppc",
+--	--"qemuppc",
+--	"pc86",
+--	"rpi",
+--	"pdpv7",
+--	"em22",
 }
 vars.plats_with_tests = {
-	"linux68k",
-	"linux386",
-	"linuxppc",
-	--"qemuppc",
-	"pc86",
+--	"linux68k",
+--	"linux386",
+--	"linuxppc",
+--	--"qemuppc",
+--	"pc86",
 }
 
 local plat_packages = {}

lang/cem/libcc.ansi/headers/ack/config.h

@@ -11,4 +11,12 @@
 #define ACKCONF_WANT_STDIO_FLOAT ACKCONF_WANT_FLOAT
 #endif
 
+#ifndef ACKCONF_WANT_STANDARD_O
+#define ACKCONF_WANT_STANDARD_O 1
+#endif
+
+#ifndef ACKCONF_WANT_STANDARD_SIGNALS
+#define ACKCONF_WANT_STANDARD_SIGNALS 1
+#endif
+
 #endif

lang/cem/libcc.ansi/headers/stdint.h

@@ -58,6 +58,7 @@ typedef int16_t         intptr_t;
 typedef uint16_t        uintptr_t;
 typedef int16_t         ptrdiff_t;
 typedef uint16_t        size_t;
+typedef int16_t         ssize_t;
 #define INTPTR_MAX      32767
 #define INTPTR_MIN      (-32768)
 #define UINTPTR_MAX     65535
@@ -66,6 +67,7 @@ typedef int32_t         intptr_t;
 typedef uint32_t        uintptr_t;
 typedef int32_t         ptrdiff_t;
 typedef uint32_t        size_t;
+typedef int32_t         ssize_t;
 #define INTPTR_MAX      2147483647
 #define INTPTR_MIN      (-2147483647)
 #define UINTPTR_MAX     4294967295

lang/cem/libcc.ansi/headers/unistd.h

@@ -1,19 +1,20 @@
-/*
- * unistd.h - standard system calls
- */
-/* $Id$ */
-
 #ifndef _UNISTD_H
 #define _UNISTD_H
 
+/* 
+ * Generic Posix prototypes used by the rest of the libc. Plats don't have to
+ * implement these if they don't care about the functionality, but if they do,
+ * they must conform to these prototypes.
+ */
+
+#include <ack/config.h>
 #include <stddef.h>
+#include <stdint.h>
+#include <sys/types.h>
 
-/* Types */
-
-typedef int pid_t;
-typedef int mode_t;
-
-/* Constants for file access (open and friends) */
+#if ACKCONF_WANT_STANDARD_O
+/* A standard set of flags for read/write/creat and friends for platforms
+ * where these aren't determined by the operating system. */
 
 enum
 {
@@ -28,31 +29,11 @@ enum
 	O_APPEND = 02000,
 	O_NONBLOCK = 04000
 };
+#endif
 
-/* Special variables */
-
-extern char** environ;
-
-/* Implemented system calls */
-
-extern void _exit(int);
-extern pid_t getpid(void);
-extern void* sbrk(int increment);
-extern int isatty(int d);
-extern off_t lseek(int fildes, off_t offset, int whence);
-extern int close(int d);
-extern int open(const char* path, int access, ...);
-extern int creat(const char* path, mode_t mode);
-extern int read(int fd, void* buffer, size_t count);
-extern int write(int fd, void* buffer, size_t count);
-extern int unlink(const char* path);
-
-/* Unimplemented system calls (these are just prototypes to let the library
- * compile). */
-
-extern int fcntl(int fd, int op, ...);
-
-/* Signal handling */
+#if ACKCONF_WANT_STANDARD_SIGNALS
+/* A standard set of definitions for signal handling for platforms where these
+ * aren't determined by the operating system. */
 
 typedef int sig_atomic_t;
 
@@ -63,10 +44,37 @@ typedef int sig_atomic_t;
 #define SIGABRT         6       /* Abort (ANSI) */
 #define SIGILL          11      /* Illegal instruction */
 
-#define _NSIG           32      /* Biggest signal number + 1
+#define _NSIG           16      /* Biggest signal number + 1
                                    (not including real-time signals).  */
 typedef void (*sighandler_t)(int);
-extern sighandler_t signal(int signum, sighandler_t handler);
-extern int raise(int signum);
+typedef uint16_t sigset_t;
+
+#endif
+
+/* Special variables */
+
+extern char** environ;
+
+/* Implemented system calls */
+
+extern int brk(void* ptr);
+extern int close(int d);
+extern int creat(const char* path, mode_t mode);
+extern int execve(const char *path, char *const argv[], char *const envp[]);
+extern int isatty(int d);
+extern int isatty(int d);
+extern int kill(pid_t old, int sig);
+extern int open(const char* path, int access, ...);
+extern int raise(int signum);
+extern int sigprocmask(int, const sigset_t *, sigset_t *);
+extern int unlink(const char* path);
+extern off_t lseek(int fildes, off_t offset, int whence);
+extern pid_t getpid(void);
+extern sighandler_t signal(int signum, sighandler_t handler);
+extern ssize_t read(int fd, void* buffer, size_t count);
+extern ssize_t write(int fd, void* buffer, size_t count);
+extern void _exit(int);
+extern void* sbrk(int increment);
+extern int fcntl(int fd, int op, ...);
 
 #endif

plat/cpm/include/build.lua

@@ -9,8 +9,8 @@ local function addheader(h)
 end
 
 addheader("ack/plat.h")
+addheader("sys/types.h")
 addheader("cpm.h")
-addheader("unistd.h")
 
 acklibrary {
 	name = "headers",

plat/cpm/include/sys/types.h

@@ -0,0 +1,7 @@
+#ifndef _SYS_TYPES_H
+#define _SYS_TYPES_H
+
+typedef int pid_t;
+typedef int mode_t;
+
+#endif

plat/cpm/libsys/read.c

@@ -8,7 +8,7 @@
 #include <unistd.h>
 #include <cpm.h>
 
-int read(int fd, void* buffer, size_t count)
+ssize_t read(int fd, void* buffer, size_t count)
 {
 	short save;
 	unsigned char before_n;
@@ -37,7 +37,7 @@ int read(int fd, void* buffer, size_t count)
 	/* Read one line from the console. */
 	((unsigned char*)buffer)[-2] = before_n;
 	cpm_bc_register = CPM_BDOS_READ_CONSOLE_BUFFER;
-	cpm_de_register = (char*)buffer - 2;
+	cpm_de_register = (uint16_t)(char*)buffer - 2;
 	cpm_bdos();
 	before_n = ((unsigned char*)buffer)[-1];
 
@@ -46,7 +46,7 @@ int read(int fd, void* buffer, size_t count)
 
 	/* Echo '\n' to console. */
 	cpm_bc_register = CPM_BDOS_PRINT_STRING;
-	cpm_de_register = "\r\n$";
+	cpm_de_register = (uint16_t)"\r\n$";
 	cpm_bdos();
 
 	return (int)before_n + 1;

plat/cpm/libsys/write.c

@@ -22,7 +22,7 @@ void _sys_write_tty(char c)
 	}
 }
 
-int write(int fd, void* buffer, size_t count)
+ssize_t write(int fd, void* buffer, size_t count)
 {
 	int i;
 	char* p = buffer;