diff options
Diffstat (limited to 'hacks/glx/sonar.man')
| -rw-r--r-- | hacks/glx/sonar.man | 57 |
1 files changed, 29 insertions, 28 deletions
diff --git a/hacks/glx/sonar.man b/hacks/glx/sonar.man index 9927b3b..00de3d2 100644 --- a/hacks/glx/sonar.man +++ b/hacks/glx/sonar.man @@ -1,19 +1,6 @@ -.de EX \"Begin example -.ne 5 -.if n .sp 1 -.if t .sp .5 -.nf -.in +.5i -.. -.de EE -.fi -.in -.5i -.if n .sp 1 -.if t .sp .5 -.. .TH Sonar 1 "12-Aug-08" "X Version 11" .SH NAME -sonar - display a sonar scope +sonar \- display a sonar scope .SH SYNOPSIS .B sonar [\-ping \fIhosts-or-subnets\fP] @@ -119,20 +106,8 @@ In simulation mode, the number of bogies on team B. .TP 8 .B \-fps Display the current frame rate, polygon count, and CPU load. -.SH NOTES -On most Unix systems, this program must be installed as setuid root -in order to ping hosts. This is because root privileges are needed -to create an ICMP RAW socket. Privileges are disavowed shortly after -startup (just after connecting to the X server) so this is believed -to be safe: -.EX -chown root:root sonar -chmod u+s sonar -.EE -It is not necessary to make it setuid on MacOS systems, because on -MacOS, unprivileged programs can ping by using ICMP DGRAM sockets -instead of ICMP RAW. +.PP In ping-mode, the display is a logarithmic scale, calibrated so that the three rings represent ping times of approximately 2.5, 70 and 2,000 milliseconds respectively. @@ -141,6 +116,32 @@ This means that if any the hosts you are pinging take longer than 2 seconds to respond, they won't show up; and if you are pinging several hosts with very fast response times, they will all appear close to the center of the screen (making their names hard to read.) + +.SH INSTALLATION +For this program to be able to ping other hosts, it must have the +ability to open ICMP sockets, which is usually an action that requires +additional privileges. + +If your system has +.BR setcap (8) +then this permission can be added with +.nf +.sp + setcap cap_net_raw=p sonar +.sp +.fi +Otherwise, the program must be setuid root in order to ping hosts. +Privileges are disavowed shortly after startup (just after connecting +to the X server) so this is believed to be safe: +.nf +.sp + chown root:root sonar + chmod u+s sonar +.sp +.fi +It is not necessary to use setcap or setuid on macOS systems, as +unprivileged programs can ping by using ICMP DGRAM sockets instead +of ICMP RAW. .SH BUGS Does not support IPv6. .SH SEE ALSO @@ -149,7 +150,7 @@ Does not support IPv6. .BR ping (8), .BR ping6 (8) .SH COPYRIGHT -Copyright \(co 2000-2012 by Jamie Zawinski <jwz@jwz.org> +Copyright \(co 2000-2021 by Jamie Zawinski <jwz@jwz.org> .RE Copyright \(co 1998 by Stephen Martin. <smartin@canada.com> |