More random compat hacking towards getting bash to build.

I'm now at the build stage where it complains about a bajillion missing
symbols. This is a good place to be!

Kernel/Process.cpp

@@ -1174,6 +1174,22 @@ int Process::sys$uname(utsname* buf)
     return 0;
 }
 
+int Process::sys$isatty(int fd)
+{
+    auto* handle = fileHandleIfExists(fd);
+    if (!handle)
+        return -EBADF;
+    if (!handle->isTTY())
+        return -ENOTTY;
+    return 1;
+}
+
+Unix::sighandler_t Process::sys$signal(int signum, Unix::sighandler_t handler)
+{
+    dbgprintf("sys$signal: %d => L%x\n", signum, handler);
+    return nullptr;
+}
+
 int Process::sys$kill(pid_t pid, int signal)
 {
     if (pid == 0) {

Kernel/Process.h

@@ -7,6 +7,7 @@
 #include <AK/Vector.h>
 #include "i386.h"
 #include <VirtualFileSystem/VirtualFileSystem.h>
+#include <VirtualFileSystem/UnixTypes.h>
 #include "TTY.h"
 
 class FileHandle;
@@ -123,6 +124,8 @@ public:
     int sys$ttyname_r(int fd, char*, size_t);
     pid_t sys$fork(RegisterDump&);
     int sys$execve(const char* filename, const char** argv, const char** envp);
+    Unix::sighandler_t sys$signal(int signum, Unix::sighandler_t);
+    int sys$isatty(int fd);
 
     static void initialize();
 

Kernel/Syscall.cpp

@@ -136,6 +136,10 @@ static DWORD handle(RegisterDump& regs, DWORD function, DWORD arg1, DWORD arg2,
         return current->sys$geteuid();
     case Syscall::PosixGetegid:
         return current->sys$getegid();
+    case Syscall::PosixSignal:
+        return (dword)current->sys$signal((int)arg1, (Unix::sighandler_t)arg2);
+    case Syscall::PosixIsatty:
+        return current->sys$isatty((int)arg1);
     default:
         kprintf("<%u> int0x80: Unknown function %x requested {%x, %x, %x}\n", current->pid(), function, arg1, arg2, arg3);
         break;

Kernel/Syscall.h

@@ -51,6 +51,8 @@ enum Function {
     PosixExecve = 0x2019,
     PosixGeteuid = 0x2020,
     PosixGetegid = 0x2021,
+    PosixSignal = 0x2022,
+    PosixIsatty = 0x2023,
 };
 
 void initialize();

LibC/Makefile

@@ -21,6 +21,8 @@ LIBC_OBJS = \
        scanf.o \
        pwd.o \
        times.o \
+       termcap.o \
+       setjmp.o \
        entry.o
 
 OBJS = $(AK_OBJS) $(LIBC_OBJS)

LibC/dirent.h

@@ -13,16 +13,17 @@ struct dirent {
     char d_name[256];
 };
 
-struct DIR {
+struct __DIR {
     int fd;
-    dirent cur_ent;
+    struct dirent cur_ent;
     char* buffer;
     size_t buffer_size;
     char* nextptr;
 };
+typedef struct __DIR DIR;
 
 DIR* opendir(const char* name);
-dirent* readdir(DIR* dirp);
+struct dirent* readdir(DIR* dirp);
 
 __END_DECLS
 

LibC/signal.cpp

@@ -11,5 +11,16 @@ int kill(pid_t pid, int sig)
     __RETURN_WITH_ERRNO(rc, rc, -1);
 }
 
+sighandler_t signal(int signum, sighandler_t handler)
+{
+    sighandler_t old_handler = (sighandler_t)Syscall::invoke(Syscall::PosixSignal, (dword)signum, (dword)handler);
+    if (old_handler == SIG_ERR) {
+        errno = EINVAL;
+        return SIG_ERR;
+    }
+    errno = 0;
+    return old_handler;
+}
+
 }
 

LibC/signal.h

@@ -19,6 +19,7 @@ struct sigaction {
 };
 
 int kill(pid_t, int sig);
+sighandler_t signal(int sig, sighandler_t);
 
 #define SIG_DFL ((__sighandler_t)0)
 #define SIG_ERR ((__sighandler_t)-1)
@@ -28,7 +29,6 @@ int kill(pid_t, int sig);
 #define SIG_UNBLOCK 1
 #define SIG_SETMASK 2
 
-
 #define SIGHUP    1
 #define SIGINT    2
 #define SIGQUIT   3 
@@ -44,6 +44,10 @@ int kill(pid_t, int sig);
 #define SIGPIPE  13
 #define SIGALRM  14
 #define SIGTERM  15
+#define SIGCONT  18
+#define SIGTSTP  20
+#define SIGTTIN  21
+#define SIGTTOU  22
 
 __END_DECLS
 

LibC/string.cpp

@@ -4,6 +4,16 @@
 
 extern "C" {
 
+void bzero(void* dest, size_t n)
+{
+    memset(dest, 0, n);
+}
+
+void bcopy(const void* src, void* dest, size_t n)
+{
+    memmove(dest, src, n);
+}
+
 void* memset(void* dest, int c, size_t n)
 {
     uint8_t* bdest = (uint8_t*)dest;
@@ -48,11 +58,23 @@ size_t strlen(const char* str)
 
 int strcmp(const char* s1, const char* s2)
 {
-    for (; *s1 == *s2; ++s1, ++s2) {
+    while (*s1 == *s2++)
-        if (*s1 == 0)
+        if (*s1++ == 0)
             return 0;
-    }
+    return *(const unsigned char*)s1 - *(const unsigned char*)--s2;
-    return *(const unsigned char*)s1 < *(const unsigned char*)s2 ? -1 : 1;
+}
+
+int strncmp(const char* s1, const char* s2, size_t n)
+{
+    if (!n)
+        return 0;
+    do {
+        if (*s1 != *s2++)
+            return *(const unsigned char*)s1 - *(const unsigned char*)--s2;
+        if (*s1++ == 0)
+            break;
+    } while (--n);
+    return 0;
 }
 
 int memcmp(const void* v1, const void* v2, size_t n)

LibC/string.h

@@ -7,8 +7,12 @@ __BEGIN_DECLS
 
 size_t strlen(const char*);
 int strcmp(const char*, const char*);
+int strncmp(const char*, const char*, size_t);
 int memcmp(const void*, const void*, size_t);
 void memcpy(void*, const void*, size_t);
+void memmove(void*, const void*, size_t);
+void bzero(void*, size_t);
+void bcopy(const void*, void*, size_t);
 void* memset(void*, int, size_t);
 char* strcpy(char* dest, const char* src);
 char* strncpy(char* dest, const char* src, size_t);

LibC/termcap.cpp

@@ -0,0 +1,10 @@
+#include <termcap.h>
+
+extern "C" {
+
+char PC;
+char* UP;
+char* BC;
+
+}
+

LibC/termcap.h

@@ -0,0 +1,12 @@
+#pragma once
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+extern char PC;
+extern char* UP;
+extern char* BC;
+
+__END_DECLS
+

LibC/termios.h

@@ -0,0 +1,198 @@
+#pragma once
+
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+__BEGIN_DECLS
+
+
+#define NCCS 32
+
+typedef uint32_t tcflag_t;
+typedef uint8_t cc_t;
+
+struct termios {
+    tcflag_t c_iflag;
+    tcflag_t c_oflag;
+    tcflag_t c_cflag;
+    tcflag_t c_lflag;
+    cc_t     c_cc[NCCS];
+};
+
+/* c_cc characters */
+#define VINTR 0
+#define VQUIT 1
+#define VERASE 2
+#define VKILL 3
+#define VEOF 4
+#define VTIME 5
+#define VMIN 6
+#define VSWTC 7
+#define VSTART 8
+#define VSTOP 9
+#define VSUSP 10
+#define VEOL 11
+#define VREPRINT 12
+#define VDISCARD 13
+#define VWERASE 14
+#define VLNEXT 15
+#define VEOL2 16
+
+/* c_iflag bits */
+#define IGNBRK	0000001
+#define BRKINT	0000002
+#define IGNPAR	0000004
+#define PARMRK	0000010
+#define INPCK	0000020
+#define ISTRIP	0000040
+#define INLCR	0000100
+#define IGNCR	0000200
+#define ICRNL	0000400
+#define IUCLC	0001000
+#define IXON	0002000
+#define IXANY	0004000
+#define IXOFF	0010000
+#define IMAXBEL	0020000
+#define IUTF8	0040000
+
+/* c_oflag bits */
+#define OPOST	0000001
+#define OLCUC	0000002
+#define ONLCR	0000004
+#define OCRNL	0000010
+#define ONOCR	0000020
+#define ONLRET	0000040
+#define OFILL	0000100
+#define OFDEL	0000200
+#if defined __USE_MISC || defined __USE_XOPEN
+# define NLDLY	0000400
+# define   NL0	0000000
+# define   NL1	0000400
+# define CRDLY	0003000
+# define   CR0	0000000
+# define   CR1	0001000
+# define   CR2	0002000
+# define   CR3	0003000
+# define TABDLY	0014000
+# define   TAB0	0000000
+# define   TAB1	0004000
+# define   TAB2	0010000
+# define   TAB3	0014000
+# define BSDLY	0020000
+# define   BS0	0000000
+# define   BS1	0020000
+# define FFDLY	0100000
+# define   FF0	0000000
+# define   FF1	0100000
+#endif
+
+#define VTDLY	0040000
+#define   VT0	0000000
+#define   VT1	0040000
+
+#ifdef __USE_MISC
+# define XTABS	0014000
+#endif
+
+/* c_cflag bit meaning */
+#ifdef __USE_MISC
+# define CBAUD	0010017
+#endif
+#define  B0	0000000		/* hang up */
+#define  B50	0000001
+#define  B75	0000002
+#define  B110	0000003
+#define  B134	0000004
+#define  B150	0000005
+#define  B200	0000006
+#define  B300	0000007
+#define  B600	0000010
+#define  B1200	0000011
+#define  B1800	0000012
+#define  B2400	0000013
+#define  B4800	0000014
+#define  B9600	0000015
+#define  B19200	0000016
+#define  B38400	0000017
+#ifdef __USE_MISC
+# define EXTA B19200
+# define EXTB B38400
+#endif
+#define CSIZE	0000060
+#define   CS5	0000000
+#define   CS6	0000020
+#define   CS7	0000040
+#define   CS8	0000060
+#define CSTOPB	0000100
+#define CREAD	0000200
+#define PARENB	0000400
+#define PARODD	0001000
+#define HUPCL	0002000
+#define CLOCAL	0004000
+#ifdef __USE_MISC
+# define CBAUDEX 0010000
+#endif
+#define  B57600   0010001
+#define  B115200  0010002
+#define  B230400  0010003
+#define  B460800  0010004
+#define  B500000  0010005
+#define  B576000  0010006
+#define  B921600  0010007
+#define  B1000000 0010010
+#define  B1152000 0010011
+#define  B1500000 0010012
+#define  B2000000 0010013
+#define  B2500000 0010014
+#define  B3000000 0010015
+#define  B3500000 0010016
+#define  B4000000 0010017
+#define __MAX_BAUD B4000000
+#ifdef __USE_MISC
+# define CIBAUD	  002003600000		/* input baud rate (not used) */
+# define CMSPAR   010000000000		/* mark or space (stick) parity */
+# define CRTSCTS  020000000000		/* flow control */
+#endif
+
+/* c_lflag bits */
+#define ISIG	0000001
+#define ICANON	0000002
+#if defined __USE_MISC || (defined __USE_XOPEN && !defined __USE_XOPEN2K)
+# define XCASE	0000004
+#endif
+#define ECHO	0000010
+#define ECHOE	0000020
+#define ECHOK	0000040
+#define ECHONL	0000100
+#define NOFLSH	0000200
+#define TOSTOP	0000400
+#ifdef __USE_MISC
+# define ECHOCTL 0001000
+# define ECHOPRT 0002000
+# define ECHOKE	 0004000
+# define FLUSHO	 0010000
+# define PENDIN	 0040000
+#endif
+#define IEXTEN	0100000
+#ifdef __USE_MISC
+# define EXTPROC 0200000
+#endif
+
+/* tcflow() and TCXONC use these */
+#define	TCOOFF		0
+#define	TCOON		1
+#define	TCIOFF		2
+#define	TCION		3
+
+/* tcflush() and TCFLSH use these */
+#define	TCIFLUSH	0
+#define	TCOFLUSH	1
+#define	TCIOFLUSH	2
+
+/* tcsetattr uses these */
+#define	TCSANOW		0
+#define	TCSADRAIN	1
+#define	TCSAFLUSH	2
+
+__END_DECLS
+

LibC/unistd.cpp

@@ -184,5 +184,11 @@ int unlink(const char*)
     assert(false);
 }
 
+int isatty(int fd)
+{
+    int rc = Syscall::invoke(Syscall::PosixIsatty, (dword)fd);
+    __RETURN_WITH_ERRNO(rc, 1, 0);
+}
+
 }
 

VirtualFileSystem/UnixTypes.h

@@ -20,6 +20,9 @@ typedef dword nlink_t;
 typedef dword uid_t;
 typedef dword gid_t;
 
+typedef void (*__sighandler_t)(int);
+typedef __sighandler_t sighandler_t;
+
 #ifdef SERENITY
 // FIXME: Support 64-bit offsets!
 typedef signed_dword off_t;