add Getwd, Fchdir, tests

R=r
DELTA=215  (186 added, 0 deleted, 29 changed)
OCL=28968
CL=28995

1 files changed, 40 insertions, 20 deletions

diff --git a/src/lib/syscall/file_linux.go b/src/lib/syscall/file_linux.go
index f6b6ea7e6..2f8b9101f 100644
--- a/src/lib/syscall/file_linux.go
+++ b/src/lib/syscall/file_linux.go
@@ -13,39 +13,39 @@ import (
 
 const nameBufsize = 512
 
-func Open(name string, mode int64, perm int64) (ret int64, errno int64) {
+func Open(name string, mode int64, perm int64) (ret, errno int64) {
 	namebuf := StringBytePtr(name);
 	r1, r2, err := Syscall(SYS_OPEN, int64(uintptr(unsafe.Pointer(namebuf))), mode, perm);
 	return r1, err;
 }
 
-func Creat(name string, perm int64) (ret int64, errno int64) {
+func Creat(name string, perm int64) (ret, errno int64) {
 	namebuf := StringBytePtr(name);
 	r1, r2, err := Syscall(SYS_OPEN, int64(uintptr(unsafe.Pointer(namebuf))),  O_CREAT|O_WRONLY|O_TRUNC, perm);
 	return r1, err;
 }
 
-func Close(fd int64) (ret int64, errno int64) {
+func Close(fd int64) (ret, errno int64) {
 	r1, r2, err := Syscall(SYS_CLOSE, fd, 0, 0);
 	return r1, err;
 }
 
-func Read(fd int64, buf *byte, nbytes int64) (ret int64, errno int64) {
+func Read(fd int64, buf *byte, nbytes int64) (ret, errno int64) {
 	r1, r2, err := Syscall(SYS_READ, fd, int64(uintptr(unsafe.Pointer(buf))), nbytes);
 	return r1, err;
 }
 
-func Write(fd int64, buf *byte, nbytes int64) (ret int64, errno int64) {
+func Write(fd int64, buf *byte, nbytes int64) (ret, errno int64) {
 	r1, r2, err := Syscall(SYS_WRITE, fd, int64(uintptr(unsafe.Pointer(buf))), nbytes);
 	return r1, err;
 }
 
-func Seek(fd int64, offset int64, whence int64) (ret int64, errno int64) {
+func Seek(fd int64, offset int64, whence int64) (ret, errno int64) {
 	r1, r2, err := Syscall(SYS_LSEEK, fd, offset, whence);
 	return r1, err;
 }
 
-func Pipe(fds *[2]int64) (ret int64, errno int64) {
+func Pipe(fds *[2]int64) (ret, errno int64) {
 	var t [2] int32;
 	r1, r2, err := Syscall(SYS_PIPE, int64(uintptr(unsafe.Pointer(&t[0]))), 0, 0);
 	if r1 < 0 {
@@ -56,77 +56,97 @@ func Pipe(fds *[2]int64) (ret int64, errno int64) {
 	return 0, 0;
 }
 
-func Stat(name string, buf *Stat_t) (ret int64, errno int64) {
+func Stat(name string, buf *Stat_t) (ret, errno int64) {
 	namebuf := StringBytePtr(name);
 	r1, r2, err := Syscall(SYS_STAT, int64(uintptr(unsafe.Pointer(namebuf))), int64(uintptr(unsafe.Pointer(buf))), 0);
 	return r1, err;
 }
 
-func Lstat(name string, buf *Stat_t) (ret int64, errno int64) {
+func Lstat(name string, buf *Stat_t) (ret, errno int64) {
 	namebuf := StringBytePtr(name);
 	r1, r2, err := Syscall(SYS_LSTAT, int64(uintptr(unsafe.Pointer(namebuf))), int64(uintptr(unsafe.Pointer(buf))), 0);
 	return r1, err;
 }
 
-func Fstat(fd int64, buf *Stat_t) (ret int64, errno int64) {
+func Fstat(fd int64, buf *Stat_t) (ret, errno int64) {
 	r1, r2, err := Syscall(SYS_FSTAT, fd, int64(uintptr(unsafe.Pointer(buf))), 0);
 	return r1, err;
 }
 
-func Unlink(name string) (ret int64, errno int64) {
+func Unlink(name string) (ret, errno int64) {
 	namebuf := StringBytePtr(name);
 	r1, r2, err := Syscall(SYS_UNLINK, int64(uintptr(unsafe.Pointer(namebuf))), 0, 0);
 	return r1, err;
 }
 
-func Rmdir(name string) (ret int64, errno int64) {
+func Rmdir(name string) (ret, errno int64) {
 	namebuf := StringBytePtr(name);
 	r1, r2, err := Syscall(SYS_RMDIR, int64(uintptr(unsafe.Pointer(namebuf))), 0, 0);
 	return r1, err;
 }
 
-func Fcntl(fd, cmd, arg int64) (ret int64, errno int64) {
+func Fcntl(fd, cmd, arg int64) (ret, errno int64) {
 	r1, r2, err := Syscall(SYS_FCNTL, fd, cmd, arg);
 	return r1, err
 }
 
-func Mkdir(name string, perm int64) (ret int64, errno int64) {
+func Mkdir(name string, perm int64) (ret, errno int64) {
 	namebuf := StringBytePtr(name);
 	r1, r2, err := Syscall(SYS_MKDIR, int64(uintptr(unsafe.Pointer(namebuf))), perm, 0);
 	return r1, err;
 }
 
-func Dup2(fd1, fd2 int64) (ret int64, errno int64) {
+func Dup2(fd1, fd2 int64) (ret, errno int64) {
 	r1, r2, err := Syscall(SYS_DUP2, fd1, fd2, 0);
 	return r1, err;
 }
 
-func Getdents(fd int64, buf *Dirent, nbytes int64) (ret int64, errno int64) {
+func Getdents(fd int64, buf *Dirent, nbytes int64) (ret, errno int64) {
 	r1, r2, err := Syscall(SYS_GETDENTS64, fd, int64(uintptr(unsafe.Pointer(buf))), nbytes);
 	return r1, err;
 }
 
-func Chdir(dir string) (ret int64, errno int64) {
+func Chdir(dir string) (ret, errno int64) {
 	namebuf := StringBytePtr(dir);
 	r1, r2, err := Syscall(SYS_CHDIR, int64(uintptr(unsafe.Pointer(namebuf))), 0, 0);
 	return r1, err;
 }
 
-func Link(oldpath, newpath string) (ret int64, errno int64) {
+func Fchdir(fd int64) (ret, errno int64) {
+	r1, r2, err := Syscall(SYS_FCHDIR, fd, 0, 0);
+	return r1, err;
+}
+
+const ImplementsGetwd = true
+
+func Getwd() (ret string, errno int64) {
+	var buf [PathMax]byte;
+	r1, r2, err := Syscall(SYS_GETCWD, int64(uintptr(unsafe.Pointer(&buf))), int64(len(buf)), 0);
+	if err != 0 {
+		return "", err;
+	}
+	// SYS_GETCWD returns the number of bytes written to buf, including the NUL.
+	if r1 < 1 || r1 > int64(len(buf)) || buf[r1-1] != 0 {
+		return "", EINVAL;
+	}
+	return string(buf[0:r1-1]), 0
+}
+
+func Link(oldpath, newpath string) (ret, errno int64) {
 	oldbuf := StringBytePtr(oldpath);
 	newbuf := StringBytePtr(newpath);
 	r1, r2, err := Syscall(SYS_LINK, int64(uintptr(unsafe.Pointer(oldbuf))), int64(uintptr(unsafe.Pointer(newbuf))), 0);
 	return r1, err;
 }
 
-func Symlink(oldpath, newpath string) (ret int64, errno int64) {
+func Symlink(oldpath, newpath string) (ret, errno int64) {
 	oldbuf := StringBytePtr(oldpath);
 	newbuf := StringBytePtr(newpath);
 	r1, r2, err := Syscall(SYS_SYMLINK, int64(uintptr(unsafe.Pointer(oldbuf))), int64(uintptr(unsafe.Pointer(newbuf))), 0);
 	return r1, err;
 }
 
-func Readlink(path string, buf *byte, nbytes int64) (ret int64, errno int64) {
+func Readlink(path string, buf *byte, nbytes int64) (ret, errno int64) {
 	pathbuf := StringBytePtr(path);
 	r1, r2, err := Syscall(SYS_READLINK, int64(uintptr(unsafe.Pointer(pathbuf))), int64(uintptr(unsafe.Pointer(buf))), nbytes);
 	return r1, err;