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Fix and improve filemon(4) example:

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- remove return statements from void function [1]
- include missing header
- use O_CLOEXEC instead of separate fcntl() calls

PR:		docs/179459 [1]
MFC after:	1 week
This commit is contained in:
Sergey Kandaurov 2013-06-14 08:28:08 +00:00
parent 126690fec1
commit 0ec5ac100c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=251744
1 changed files with 4 additions and 8 deletions
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12
share/man/man4/filemon.4
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@ -31,7 +31,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd May 30, 2012
.Dd June 14, 2013
.Dt FILEMON 4
.Os
.Sh NAME
@ -126,6 +126,7 @@ is set to indicate the error.
#include <dev/filemon/filemon.h>
#include <fcntl.h>
#include <err.h>
#include <unistd.h>
static void
open_filemon(void)
@ -133,29 +134,24 @@ open_filemon(void)
pid_t child;
int fm_fd, fm_log;
if ((fm_fd = open("/dev/filemon", O_RDWR)) == -1)
if ((fm_fd = open("/dev/filemon", O_RDWR | O_CLOEXEC)) == -1)
err(1, "open(\e"/dev/filemon\e", O_RDWR)");
if ((fm_log = open("filemon.out",
O_CREAT | O_WRONLY | O_TRUNC, DEFFILEMODE)) == -1)
O_CREAT | O_WRONLY | O_TRUNC | O_CLOEXEC, DEFFILEMODE)) == -1)
err(1, "open(filemon.out)");
if (ioctl(fm_fd, FILEMON_SET_FD, &fm_log) == -1)
err(1, "Cannot set filemon log file descriptor");
/* Set up these two fd's to close on exec. */
(void)fcntl(fm_fd, F_SETFD, FD_CLOEXEC);
(void)fcntl(fm_log, F_SETFD, FD_CLOEXEC);
if ((child = fork()) == 0) {
child = getpid();
if (ioctl(fm_fd, FILEMON_SET_PID, &child) == -1)
err(1, "Cannot set filemon PID");
/* Do something here. */
return 0;
} else {
wait(&child);
close(fm_fd);
}
return 0;
}
.Ed
.Pp