>On second thought it seems the ps command is switchning between bsd behaviour
>(old /usr/ucb/ps) if
options are not preceded with '-' and "new" solaris behaviour if there is a '-'
>Is that correct ?
Almost.
This is what the main routine in ps look like today:
int
main(int argc, char **argv)
{
const char *me;
/*
* The original two ps'es are linked in a single binary;
* their main()s are renamed to stdmain for /usr/bin/ps and
* ucbmain for /usr/ucb/ps.
* We try to figure out which instance of ps the user wants to run.
* Traditionally, the UCB variant doesn't require the flag argument
* start with a "-". If the first argument doesn't start with a
* "-", we call "ucbmain".
* If there's a first argument and it starts with a "-", we check
* whether any of the options isn't acceptable to "ucbmain"; in that
* case we run "stdmain".
* If we can't tell from the options which main to call, we check
* the binary we are running. We default to "stdmain" but
* any mention in the executable name of "ucb" causes us to call
* ucbmain.
*/
if (argv[1] != NULL) {
if (argv[1][0] != '-')
return (ucbmain(argc, argv));
else if (argv[1][strspn(argv[1], UCB_OPTS)] != '\0')
return (stdmain(argc, argv));
}
me = getexecname();
if (me != NULL && strstr(me, "ucb") != NULL)
return (ucbmain(argc, argv));
else
return (stdmain(argc, argv));
}
E.g.:
% ps -uxg
ps: unknown user xg
% /usr/ucb/ps -uxg
USER PID %CPU %MEM SZ RSS TT S START TIME COMMAND
...
% ps -a (bin in PATH before ucb)
PID TTY TIME CMD
6791 pts/5 0:00 tcsh
7185 pts/4 0:00 less
7190 pts/5 0:00 ps
% ps -a (ucb before bin)
PID TT S TIME COMMAND
3933 console S 0:00 /usr/lib/saf/ttymon -g -d /dev/console -l console -T xt
6730 pts/1 S 0:00 tcsh
6710 pts/2 S 0:00 tcsh
6687 pts/3 S 0:00 tcsh
6711 pts/4 S 0:00 tcsh
7185 pts/4 S 0:00 /opt/bin/less usr/src/cmd/ps/ps.c
6686 pts/5 S 0:00 tcsh
6791 pts/5 T 0:00 /usr/bin/tcsh
7192 pts/5 O 0:00 ps -a
Mostly it works nice except, possibly, when you want to get the usage
message.
Casper
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