Fizz Buzz on procfs

procfs.fizzbuzz.c.diff

diff --git a/sys/miscfs/procfs/procfs.h b/sys/miscfs/procfs/procfs.h
index 170368f..e093a59 100644
--- a/sys/miscfs/procfs/procfs.h
+++ b/sys/miscfs/procfs/procfs.h
@@ -110,6 +110,7 @@ typedef enum {
 	PFSstatm,	/* process memory info (if -o linux) */
 	PFSversion,	/* kernel version (if -o linux) */
 	PFStask,	/* task subdirector (if -o linux) */
+	PFSfizzbuzz,	/* Fizz Buzz */
 #ifdef __HAVE_PROCFS_MACHDEP
 	PROCFS_MACHDEP_NODE_TYPES
 #endif
@@ -230,6 +231,8 @@ int procfs_doemul(struct lwp *, struct proc *, struct pfsnode *,
     struct uio *);
 int procfs_doversion(struct lwp *, struct proc *, struct pfsnode *,
     struct uio *);
+int procfs_dofizzbuzz(struct lwp *, struct proc *, struct pfsnode *,
+    struct uio *);
 
 void procfs_revoke_vnodes(struct proc *, void *);
 void procfs_hashinit(void);
diff --git a/sys/miscfs/procfs/procfs_fizzbuzz.c b/sys/miscfs/procfs/procfs_fizzbuzz.c
new file mode 100644
index 0000000..243d7c7
--- /dev/null
+++ b/sys/miscfs/procfs/procfs_fizzbuzz.c
@@ -0,0 +1,97 @@
+/*      $NetBSD$      */
+
+/*-
+ * Copyright (C) 2012 NONAKA Kimihiro <nonaka@netbsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__KERNEL_RCSID(0, "$NetBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/time.h>
+#include <sys/kernel.h>
+#include <sys/proc.h>
+#include <sys/vnode.h>
+#include <sys/exec.h>
+#include <sys/resource.h>
+#include <sys/resourcevar.h>
+#include <sys/signal.h>
+#include <sys/signalvar.h>
+#include <sys/tty.h>
+#include <sys/malloc.h>
+#include <sys/mount.h>
+#include <sys/conf.h>
+#include <sys/sysctl.h>
+#include <sys/kauth.h>
+#include <sys/filedesc.h>
+
+#include <miscfs/procfs/procfs.h>
+
+#include <uvm/uvm_extern.h>
+#include <uvm/uvm.h>
+
+extern struct devsw_conv *devsw_conv;
+extern int max_devsw_convs;
+
+#define PGTOB(p)	((unsigned long)(p) << PAGE_SHIFT)
+#define PGTOKB(p)	((unsigned long)(p) << (PAGE_SHIFT - 10))
+
+#define LBFSZ (8 * 1024)
+
+int
+procfs_dofizzbuzz(struct lwp *curl, struct proc *p,
+    struct pfsnode *pfs, struct uio *uio)
+{
+	char *bf;
+	char fizzbuzz[sizeof("あずにゃんぺろぺろ")];
+	int len;
+	int error = 0;
+
+	bf = malloc(LBFSZ, M_TEMP, M_WAITOK);
+
+	sysctl_lock(false);
+
+	if (p->p_pid == 0) {
+		strlcpy(fizzbuzz, "あずにゃんぺろぺろ", sizeof(fizzbuzz));
+	} else if ((p->p_pid % 15) == 0) {
+		strlcpy(fizzbuzz, "あずにゃん", sizeof(fizzbuzz));
+	} else if ((p->p_pid % 3) == 0) {
+		strlcpy(fizzbuzz, "あず", sizeof(fizzbuzz));
+	} else if ((p->p_pid % 5) == 0) {
+		strlcpy(fizzbuzz, "にゃん", sizeof(fizzbuzz));
+	} else {
+		snprintf(fizzbuzz, sizeof(fizzbuzz), "%d", p->p_pid);
+	}
+	len = snprintf(bf, LBFSZ, "%s\r\n", fizzbuzz);
+
+	if (len == 0)
+		goto out;
+
+	error = uiomove_frombuf(bf, len, uio);
+out:
+	free(bf, M_TEMP);
+	sysctl_unlock();
+	return error;
+}
diff --git a/sys/miscfs/procfs/procfs_subr.c b/sys/miscfs/procfs/procfs_subr.c
index 8b67ced..8886d7c 100644
--- a/sys/miscfs/procfs/procfs_subr.c
+++ b/sys/miscfs/procfs/procfs_subr.c
@@ -297,6 +297,7 @@ procfs_allocvp(struct mount *mp, struct vnode **vpp, pid_t pid,
 	case PFSloadavg:	/* /proc/loadavg = -r--r--r-- */
 	case PFSstatm:	/* /proc/N/statm = -r--r--r-- */
 	case PFSversion:	/* /proc/version = -r--r--r-- */
+	case PFSfizzbuzz:	/* /proc/N/fizzbuzz = -r--r--r-- */
 		pfs->pfs_mode = S_IRUSR|S_IRGRP|S_IROTH;
 		vp->v_type = VREG;
 		break;
@@ -475,6 +476,10 @@ procfs_rw(void *v)
 		error = procfs_doversion(curl, p, pfs, uio);
 		break;
 
+	case PFSfizzbuzz:
+		error = procfs_dofizzbuzz(curl, p, pfs, uio);
+		break;
+
 #ifdef __HAVE_PROCFS_MACHDEP
 	PROCFS_MACHDEP_NODETYPE_CASES
 		error = procfs_machdep_rw(curl, l, pfs, uio);
diff --git a/sys/miscfs/procfs/procfs_vfsops.c b/sys/miscfs/procfs/procfs_vfsops.c
index aac4e1e..00a7e6d 100644
--- a/sys/miscfs/procfs/procfs_vfsops.c
+++ b/sys/miscfs/procfs/procfs_vfsops.c
@@ -360,7 +360,7 @@ procfs_modcmd(modcmd_t cmd, void *arg)
 		sysctl_createv(&procfs_sysctl_log, 0, NULL, NULL,
 			       CTLFLAG_PERMANENT,
 			       CTLTYPE_NODE, "procfs",
-			       SYSCTL_DESCR("Process file system"),
+			       SYSCTL_DESCR("Fizz Buzz"),
 			       NULL, 0, NULL, 0,
 			       CTL_VFS, 12, CTL_EOL);
 		/*
diff --git a/sys/miscfs/procfs/procfs_vnops.c b/sys/miscfs/procfs/procfs_vnops.c
index 89e41bf..7f9e9ff8 100644
--- a/sys/miscfs/procfs/procfs_vnops.c
+++ b/sys/miscfs/procfs/procfs_vnops.c
@@ -176,6 +176,7 @@ static const struct proc_target {
 	{ DT_LNK, N("emul"),	PFSemul,	NULL },
 	{ DT_REG, N("statm"),	PFSstatm,	procfs_validfile_linux },
 	{ DT_DIR, N("task"),	PFStask,	procfs_validfile_linux },
+	{ DT_REG, N("fizzbuzz"),PFSfizzbuzz,	NULL },
 #ifdef __HAVE_PROCFS_MACHDEP
 	PROCFS_MACHDEP_NODETYPE_DEFNS
 #endif
@@ -745,6 +746,7 @@ procfs_getattr(void *v)
 	case PFScpustat:
 	case PFSloadavg:
 	case PFSversion:
+	case PFSfizzbuzz:
 		vap->va_nlink = 1;
 		vap->va_uid = vap->va_gid = 0;
 		break;
@@ -865,6 +867,7 @@ procfs_getattr(void *v)
 	case PFSloadavg:
 	case PFSstatm:
 	case PFSversion:
+	case PFSfizzbuzz:
 		vap->va_bytes = vap->va_size = 0;
 		break;
 	case PFSmap: