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Index: include/stdlib.h
===================================================================
--- include/stdlib.h
+++ include/stdlib.h
@@ -278,6 +278,7 @@
char *devname_r(__dev_t, __mode_t, char *, int);
char *fdevname(int);
char *fdevname_r(int, char *, int);
+int fdwalk(int (*)(void *, int), void *);
int getloadavg(double [], int);
const char *
getprogname(void);
Index: lib/libc/stdlib/Makefile.inc
===================================================================
--- lib/libc/stdlib/Makefile.inc
+++ lib/libc/stdlib/Makefile.inc
@@ -7,7 +7,7 @@
MISRCS+=C99_Exit.c a64l.c abort.c abs.c atexit.c atof.c atoi.c atol.c atoll.c \
bsearch.c \
cxa_thread_atexit.c cxa_thread_atexit_impl.c \
- div.c exit.c getenv.c getopt.c getopt_long.c \
+ div.c exit.c fdwalk.c getenv.c getopt.c getopt_long.c \
getsubopt.c hcreate.c hcreate_r.c hdestroy_r.c heapsort.c heapsort_b.c \
hsearch_r.c imaxabs.c imaxdiv.c \
insque.c l64a.c labs.c ldiv.c llabs.c lldiv.c lsearch.c \
@@ -32,7 +32,7 @@
MAN+= a64l.3 abort.3 abs.3 alloca.3 atexit.3 atof.3 \
atoi.3 atol.3 at_quick_exit.3 bsearch.3 \
- div.3 exit.3 getenv.3 getopt.3 getopt_long.3 getsubopt.3 \
+ div.3 exit.3 fdwalk.3 getenv.3 getopt.3 getopt_long.3 getsubopt.3 \
hcreate.3 imaxabs.3 imaxdiv.3 insque.3 labs.3 ldiv.3 llabs.3 lldiv.3 \
lsearch.3 memory.3 ptsname.3 qsort.3 \
quick_exit.3 \
Index: lib/libc/stdlib/Symbol.map
===================================================================
--- lib/libc/stdlib/Symbol.map
+++ lib/libc/stdlib/Symbol.map
@@ -124,6 +124,10 @@
set_constraint_handler_s;
};
+FBSD_1.6 {
+ fdwalk;
+};
+
FBSDprivate_1.0 {
__system;
_system;
Index: lib/libc/stdlib/fdwalk.3
===================================================================
--- /dev/null
+++ lib/libc/stdlib/fdwalk.3
@@ -0,0 +1,60 @@
+.\" Copyright (c) 2019 Justin Hibbits
+.\"
+.\" 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.
+.\" 3. Neither the name of the University nor the names of its contributors
+.\" may be used to endorse or promote products derived from this software
+.\" without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd August 9, 2019
+.Dt FDWALK 3
+.Os
+.Sh NAME
+.Nm fdwalk
+.Nd iterate over open file descriptors
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In stdlib.h
+.Ft int
+.Fn fdwalk "int (*cb)(void *, int)" "void *cbd"
+.Sh DESCRIPTION
+The
+.Nm
+function walks the list of currently open file descriptors and the
+.Ar cb
+callback on each descriptor.
+.Sh SEE ALSO
+.Xr closefrom 2
+.Xr kinfo_getfile 3
+.Sh HISTORY
+The
+.Nm
+function first appeared in SunOS.
+.Sh BUGS
+The
+.Nm
+function is potentially not thread safe. It uses malloc(3) and sysctl(3) behind
+the scenes. It also only takes a snapshot, so any file descriptors created
+after the snapshot is taken, either in another thread or in the callback
+function, are not handled.
Index: lib/libc/stdlib/fdwalk.c
===================================================================
--- /dev/null
+++ lib/libc/stdlib/fdwalk.c
@@ -0,0 +1,73 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2019 Justin Hibbits
+ *
+ * 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 REGENTS OR CONTRIBUTORS 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/param.h>
+#include <sys/sysctl.h>
+#include <sys/user.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+int
+fdwalk(int (*cb)(void *, int), void *cbd)
+{
+ int mib[4];
+ int error;
+ size_t len;
+ char *buf, *bp, *eb;
+ struct kinfo_file *kf;
+
+ len = 0;
+ mib[0] = CTL_KERN;
+ mib[1] = KERN_PROC;
+ mib[2] = KERN_PROC_FILEDESC;
+ mib[3] = getpid();
+
+ error = sysctl(mib, nitems(mib), NULL, &len, NULL, 0);
+ if (error)
+ return (-1);
+ buf = malloc(len);
+ if (buf == NULL)
+ return (-1);
+ error = sysctl(mib, nitems(mib), buf, &len, NULL, 0);
+ if (error) {
+ free(buf);
+ return (-1);
+ }
+ bp = buf;
+ eb = buf + len;
+ while (bp < eb) {
+ kf = (struct kinfo_file *)(uintptr_t)bp;
+ if (kf->kf_structsize == 0)
+ break;
+ error = cb(cbd, kf->kf_fd);
+ if (error != 0)
+ break;
+ bp += kf->kf_structsize;
+ }
+ free(buf);
+ return (error);
+}

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