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filemon(4): Better error checking in code example

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Discussed with:	dim
Reviewed by:	markj
Differential Revision:	https://reviews.freebsd.org/D38367
This commit is contained in:
Pau Amma 2023-08-01 11:24:44 -03:00 committed by Mitchell Horne
parent 848ff9bc1b
commit 258c6d5e9b
1 changed files with 11 additions and 4 deletions
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15
share/man/man4/filemon.4
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@ -31,7 +31,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd February 1, 2022
.Dd August 1, 2023
.Dt FILEMON 4
.Os
.Sh NAME
@ -193,12 +193,13 @@ no log entry for the system call.
#include <dev/filemon/filemon.h>
#include <fcntl.h>
#include <err.h>
#include <errno.h>
#include <unistd.h>
static void
open_filemon(void)
{
pid_t child;
pid_t child, wait_rv;
int fm_fd, fm_log;
if ((fm_fd = open("/dev/filemon", O_RDWR | O_CLOEXEC)) == -1)
@ -215,8 +216,14 @@ open_filemon(void)
if (ioctl(fm_fd, FILEMON_SET_PID, &child) == -1)
err(1, "Cannot set filemon PID");
/* Do something here. */
} else {
wait(&child);
} else if (child == -1)
err(1, "Cannot fork child");
else {
while ((wait_rv = wait(&child)) == -1 &&
errno == EINTR)
;
if (wait_rv == -1)
err(1, "cannot wait for child");
close(fm_fd);
}
}