tryto(1)						      General Commands Manual							  tryto(1)

NAME

       tryto - tries to run a command limited by a timeout or number of tries, can be used to run as svlogd(8) processor.

SYNOPSIS

       tryto [-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 standard 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  termi-
       nate, 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 seconds.  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) processor (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 filedescrip-
       tor 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
       message 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 ALSO

       socklog(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)