Add function linux_msg() for regulating output from the linux emulation

code, make the emulator use it.

Rename unsupported_msg() to unimplemented_syscall().  Rename some arguments
for clarity

Fixup grammar.

Requested by: bde

sys/compat/linux/linux_ioctl.c

@@ -2395,7 +2395,7 @@ linux_ioctl(struct thread *td, struct linux_ioctl_args *args)
 	}
 	fdrop(fp, td);
 
-	printf("linux: 'ioctl' fd=%d, cmd=0x%x ('%c',%d) not implemented\n",
+	linux_msg(td, "ioctl fd=%d, cmd=0x%x ('%c',%d) is not implemented",
 	    args->fd, (int)(args->cmd & 0xffff),
 	    (int)(args->cmd & 0xff00) >> 8, (int)(args->cmd & 0xff));
 

sys/compat/linux/linux_ipc.c

@@ -556,7 +556,7 @@ linux_semctl(struct thread *td, struct linux_semctl_args *args)
 	case LINUX_SETALL:
 		/* FALLTHROUGH */
 	default:
-		uprintf("linux: 'ipc' typ=%d not implemented\n",
+		linux_msg(td, "ipc type %d is not implemented",
 		  args->cmd & ~LINUX_IPC_64);
 		return EINVAL;
 	}
@@ -783,8 +783,7 @@ linux_shmctl(struct thread *td, struct linux_shmctl_args *args)
     case LINUX_SHM_LOCK:
     case LINUX_SHM_UNLOCK:
     default:
-	uprintf("linux: 'ipc' typ=%d not implemented\n",
-	  args->cmd & ~LINUX_IPC_64);
+	linux_msg(td, "ipc typ=%d not implemented", args->cmd & ~LINUX_IPC_64);
 	return EINVAL;
     }
 }

sys/compat/linux/linux_sysctl.c

@@ -35,10 +35,13 @@
 #include <sys/proc.h>
 #include <sys/sysctl.h>
 #include <sys/systm.h>
+#include <sys/sbuf.h>
 
 #include <machine/../linux/linux.h>
 #include <machine/../linux/linux_proto.h>
 
+#include <compat/linux/linux_util.h>
+
 #define	LINUX_CTL_KERN		1
 #define	LINUX_CTL_VM		2
 #define	LINUX_CTL_NET		3
@@ -78,6 +81,7 @@ int
 linux_sysctl(struct thread *td, struct linux_sysctl_args *args)
 {
 	struct l___sysctl_args la;
+	struct sbuf *sb;
 	l_int *mib;
 	int error, i;
 
@@ -113,10 +117,18 @@ linux_sysctl(struct thread *td, struct linux_sysctl_args *args)
 		break;
 	}
 
-	printf("linux: sysctl: unhandled name=");
-	for (i = 0; i < la.nlen; i++)
-		printf("%c%d", (i) ? ',' : '{', mib[i]);
-	printf("}\n");
+	sb = sbuf_new(NULL, NULL, 20 + la.nlen * 5, SBUF_AUTOEXTEND);
+	if (sb == NULL) {
+		linux_msg(td, "sysctl is not implemented");
+	} else {
+		sbuf_printf(sb, "sysctl ");
+		for (i = 0; i < la.nlen; i++)
+			sbuf_printf(sb, "%c%d", (i) ? ',' : '{', mib[i]);
+		sbuf_printf(sb, "} is not implemented");
+		sbuf_finish(sb);
+		linux_msg(td, "%s", sbuf_data(sb));
+		sbuf_delete(sb);
+	}
 
 	free(mib, M_TEMP);
 	return (ENOTDIR);

sys/compat/linux/linux_util.c

@@ -37,6 +37,8 @@
 #include <sys/malloc.h>
 #include <sys/vnode.h>
 
+#include <machine/stdarg.h>
+
 #include <compat/linux/linux_util.h>
 
 const char      linux_emul_path[] = "/compat/linux";
@@ -200,3 +202,17 @@ linux_emul_convpath(td, path, pathseg, pbuf, cflag)
 	bcopy(ptr, buf, len);
 	return error;
 }
+
+void
+linux_msg(const struct thread *td, const char *fmt, ...)
+{
+	va_list ap;
+	struct proc *p;
+
+	p = td->td_proc;
+	printf("linux: pid %d (%s): ", (int)p->p_pid, p->p_comm);
+	va_start(ap, fmt);
+	vprintf(fmt, ap);
+	va_end(ap);
+	printf("\n");
+}

sys/compat/linux/linux_util.h

@@ -45,6 +45,7 @@
 #include <machine/vmparam.h>
 #include <sys/exec.h>
 #include <sys/sysent.h>
+#include <sys/syslog.h>
 #include <sys/cdefs.h>
 #include <sys/uio.h>
 
@@ -108,16 +109,18 @@ int linux_emul_find(struct thread *, caddr_t *, char *, char **, int);
 int									\
 linux_ ## s(struct thread *p, struct linux_ ## s ## _args *args)	\
 {									\
-	return (unsupported_msg(p, #s));				\
+	return (unimplemented_syscall(p, #s));				\
 }									\
 struct __hack
 
+void linux_msg(const struct thread *td, const char *fmt, ...)
+	__printflike(2, 3);
+
 static __inline int
-unsupported_msg(struct thread *td, const char *fname)
+unimplemented_syscall(struct thread *td, const char *syscallname)
 {
 
-	printf("linux: syscall %s is obsoleted or not implemented pid %ld "
-	    "(%s)\n", fname, (long)td->td_proc->p_pid, td->td_proc->p_comm);
+	linux_msg(td, "syscall %s not implemented", syscallname);
 	return (ENOSYS);
 }