Kernel/LibC: Implement tcgetpgrp

userspace/libraries/LibC/include/sys/syscall.h

@@ -39,6 +39,7 @@ __BEGIN_DECLS
 	O(SYS_DUP,				dup)			\
 	O(SYS_DUP2,				dup2)			\
 	O(SYS_KILL,				kill)			\
+	O(SYS_TCGETPGRP,		tcgetpgrp)		\
 	O(SYS_TCSETPGRP,		tcsetpgrp)		\
 	O(SYS_GET_PID,			getpid)			\
 	O(SYS_GET_PGID,			getpgid)		\

userspace/libraries/LibC/unistd.cpp

@@ -483,6 +483,11 @@ pid_t getpgid(pid_t pid)
 	return syscall(SYS_GET_PGID, pid);
 }
 
+int tcgetpgrp(int fildes)
+{
+	return syscall(SYS_TCGETPGRP, fildes);
+}
+
 int seteuid(uid_t uid)
 {
 	return syscall(SYS_SET_EUID, uid);