Module Name: src
Committed By: christos
Date: Sun Nov 25 01:05:04 UTC 2012
Modified Files:
src/sys/kern: uipc_sem.c
src/sys/sys: ksem.h
Log Message:
expose ksem_t for fstat(8), and implement stat for future reference.
To generate a diff of this commit:
cvs rdiff -u -r1.38 -r1.39 src/sys/kern/uipc_sem.c
cvs rdiff -u -r1.13 -r1.14 src/sys/sys/ksem.h
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/kern/uipc_sem.c
diff -u src/sys/kern/uipc_sem.c:1.38 src/sys/kern/uipc_sem.c:1.39
--- src/sys/kern/uipc_sem.c:1.38 Tue Mar 13 14:40:55 2012
+++ src/sys/kern/uipc_sem.c Sat Nov 24 20:05:04 2012
@@ -1,4 +1,4 @@
-/* $NetBSD: uipc_sem.c,v 1.38 2012/03/13 18:40:55 elad Exp $ */
+/* $NetBSD: uipc_sem.c,v 1.39 2012/11/25 01:05:04 christos Exp $ */
/*-
* Copyright (c) 2011 The NetBSD Foundation, Inc.
@@ -60,7 +60,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: uipc_sem.c,v 1.38 2012/03/13 18:40:55 elad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: uipc_sem.c,v 1.39 2012/11/25 01:05:04 christos Exp $");
#include <sys/param.h>
#include <sys/kernel.h>
@@ -88,21 +88,6 @@ MODULE(MODULE_CLASS_MISC, ksem, NULL);
#define KS_UNLINKED 0x01
-typedef struct ksem {
- LIST_ENTRY(ksem) ks_entry; /* global list entry */
- kmutex_t ks_lock; /* lock on this ksem */
- kcondvar_t ks_cv; /* condition variable */
- u_int ks_ref; /* number of references */
- u_int ks_value; /* current value */
- u_int ks_waiters; /* number of waiters */
- char * ks_name; /* name, if named */
- size_t ks_namelen; /* length of name */
- int ks_flags; /* for KS_UNLINKED */
- mode_t ks_mode; /* protection bits */
- uid_t ks_uid; /* creator uid */
- gid_t ks_gid; /* creator gid */
-} ksem_t;
-
static kmutex_t ksem_lock __cacheline_aligned;
static LIST_HEAD(,ksem) ksem_head __cacheline_aligned;
static u_int nsems_total __cacheline_aligned;
@@ -114,14 +99,17 @@ static int ksem_sysinit(void);
static int ksem_sysfini(bool);
static int ksem_modcmd(modcmd_t, void *);
static int ksem_close_fop(file_t *);
+static int ksem_stat_fop(file_t *, struct stat *);
+static int ksem_read_fop(file_t *, off_t *, struct uio *,
+ kauth_cred_t, int);
static const struct fileops semops = {
- .fo_read = fbadop_read,
+ .fo_read = ksem_read_fop,
.fo_write = fbadop_write,
.fo_ioctl = fbadop_ioctl,
.fo_fcntl = fnullop_fcntl,
.fo_poll = fnullop_poll,
- .fo_stat = fbadop_stat,
+ .fo_stat = ksem_stat_fop,
.fo_close = ksem_close_fop,
.fo_kqfilter = fnullop_kqfilter,
.fo_restart = fnullop_restart,
@@ -536,6 +524,53 @@ sys__ksem_close(struct lwp *l, const str
}
static int
+ksem_read_fop(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred,
+ int flags)
+{
+ size_t len;
+ char *name;
+ ksem_t *ks = fp->f_data;
+
+ mutex_enter(&ks->ks_lock);
+ len = ks->ks_namelen;
+ name = ks->ks_name;
+ mutex_exit(&ks->ks_lock);
+ if (name == NULL || len == 0)
+ return 0;
+ return uiomove(name, len, uio);
+}
+
+static int
+ksem_stat_fop(file_t *fp, struct stat *ub)
+{
+ ksem_t *ks = fp->f_data;
+
+ mutex_enter(&ks->ks_lock);
+
+ memset(ub, 0, sizeof(*ub));
+
+ ub->st_mode = ks->ks_mode | ((ks->ks_name && ks->ks_namelen)
+ ? _S_IFLNK : _S_IFREG);
+ ub->st_uid = ks->ks_uid;
+ ub->st_gid = ks->ks_gid;
+ ub->st_size = ks->ks_value;
+ ub->st_blocks = (ub->st_size) ? 1 : 0;
+ ub->st_nlink = ks->ks_ref;
+ ub->st_blksize = 4096;
+
+ nanotime(&ub->st_atimespec);
+ ub->st_mtimespec = ub->st_ctimespec = ub->st_birthtimespec =
+ ub->st_atimespec;
+
+ /*
+ * Left as 0: st_dev, st_ino, st_rdev, st_flags, st_gen.
+ * XXX (st_dev, st_ino) should be unique.
+ */
+ mutex_exit(&ks->ks_lock);
+ return 0;
+}
+
+static int
ksem_close_fop(file_t *fp)
{
ksem_t *ks = fp->f_data;
Index: src/sys/sys/ksem.h
diff -u src/sys/sys/ksem.h:1.13 src/sys/sys/ksem.h:1.14
--- src/sys/sys/ksem.h:1.13 Sat Mar 10 16:52:00 2012
+++ src/sys/sys/ksem.h Sat Nov 24 20:05:04 2012
@@ -1,4 +1,4 @@
-/* $NetBSD: ksem.h,v 1.13 2012/03/10 21:52:00 joerg Exp $ */
+/* $NetBSD: ksem.h,v 1.14 2012/11/25 01:05:04 christos Exp $ */
/*
* Copyright (c) 2002 Alfred Perlstein <alf...@freebsd.org>
@@ -36,6 +36,21 @@ struct timespec;
#ifdef _KERNEL
#define KSEM_MAX 128
+typedef struct ksem {
+ LIST_ENTRY(ksem) ks_entry; /* global list entry */
+ kmutex_t ks_lock; /* lock on this ksem */
+ kcondvar_t ks_cv; /* condition variable */
+ u_int ks_ref; /* number of references */
+ u_int ks_value; /* current value */
+ u_int ks_waiters; /* number of waiters */
+ char * ks_name; /* name, if named */
+ size_t ks_namelen; /* length of name */
+ int ks_flags; /* for KS_UNLINKED */
+ mode_t ks_mode; /* protection bits */
+ uid_t ks_uid; /* creator uid */
+ gid_t ks_gid; /* creator gid */
+} ksem_t;
+
int do_ksem_init(struct lwp *, unsigned int, intptr_t *, copyout_t);
int do_ksem_open(struct lwp *, const char *, int, mode_t, unsigned int,
intptr_t *, copyout_t);
