tryto(1)tryto(1)NAMEtryto - tries to run a command limited by a timeout or number of tries,
can be used to run as svlogd(8) processor.
SYNOPSIStryto [-pPv] [-t sec] [-k ksec] [-n tries] prog
DESCRIPTION
prog consist of one or more arguments.
tryto runs and watches prog, feeding its standard input to prog's stan‐
dard input. If prog exits with a return code other then 0, tryto runs
prog again after sleeping one second.
If the number of retries reaches the maximal number of tries, tryto
prints an error message and gives up.
If the timeout sec seconds is reached and prog is still running, tryto
sends a TERM signal to prog, waits ksec seconds for prog to terminate,
then sends a KILL signal if prog still is there, and exits as soon as
possible.
OPTIONS-t sec timeout. Set the timeout to send TERM to prog to sec seconds.
Default is 180.
-k ksec
kill timeout. Set the timeout to send KILL to prog to ksec sec‐
onds. Default is 5.
-n tries
Set the maximal number of tries to tries. If prog exited with a
return code other that 0, tryto tries to rewind standard input
to the beginning using lseek(2) before starting prog again.
Default is 5.
-p processor. Use this option if you run tryto as a svlogd(8) pro‐
cessor (see below).
-P process group. Run prog in a new session and process group, and
send signals on timeout to prog's process group instead of its
pid.
-v verbose. Print verbose messages to standard error.
PROCESSOR
If tryto sees the -p option, tryto runs as a svlogd(8) or multilog(8)
processor, making use of filedescriptors 4 and 5:
Before starting prog, tryto moves the filedescriptor 5 to 2, so all
error messages from tryto and prog will be saved in svlogd(8)'s state
to be processed on the next run of tryto-p.
After starting prog, tryto first feeds all data it reads from
filedescriptor 4 into prog's standard input, then all data from
filedescriptor 0.
If prog fails by timeout sec seconds or maximal number of tries, tryto
prints all data from standard input to standard output, an error mes‐
sage to standard error, and exits with 0.
EXIT CODES
If tryto itself fails, it returns 111.
If tryto runs as a svlogd(8) processor, tryto returns 0 in all other
cases.
If prog was run successfully, tryto returns 0.
If prog failed by timeout, tryto returns 100.
If prog failed by maximal number of tries, tryto returns the last
return code from prog.
SEE ALSOsocklog(8), uncat(1), svlogd(8), multilog(8), lseek(2)
http://smarden.org/socklog/
http://smarden.org/runit/
AUTHOR
Gerrit Pape <pape@smarden.org>
tryto(1)
