diff options
| author | Pau Amma <pauamma@gundo.com> | 2023-08-01 14:24:44 +0000 |
|---|---|---|
| committer | Mitchell Horne <mhorne@FreeBSD.org> | 2023-08-01 14:30:38 +0000 |
| commit | 258c6d5e9b98122e45c23122cccafee6ce2958b9 (patch) | |
| tree | ee9bc75e4b0dc41d82a255ebbf3df5c8030a22be /share/man/man4 | |
| parent | 848ff9bc1b97b04a0b7328ec7079fb031fef452d (diff) | |
filemon(4): Better error checking in code example
Discussed with: dim
Reviewed by: markj
Differential Revision: https://reviews.freebsd.org/D38367
Diffstat (limited to 'share/man/man4')
| -rw-r--r-- | share/man/man4/filemon.4 | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/share/man/man4/filemon.4 b/share/man/man4/filemon.4 index 9fb2fe10a2ec..b7e7f30133be 100644 --- a/share/man/man4/filemon.4 +++ b/share/man/man4/filemon.4 @@ -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); } } |