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 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 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 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 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)