Mercurial > hg > toybox
view toys/posix/who.c @ 1531:3ff823086c99 draft
Teach ln -f to leave original target alone if link creation fails.
Suggested by Ashwini Sharma, I wound up implementing it by creating the new
link at a temporary name and renaming it over the old one instead of renaming
the old file out of the way and putting it back if it failed.
(Because "mkdir -p one/one/blah && ln -sf /bin/one one" would otherwise
rename one/one out of the way and only notice it can't delete it way at the
end when recovery's darn awkward, vs create new thing and if rename fails
(including EISDIR) that's the main error path. And yes the temporary name
is in the same directory as the destination so we never rename between mounts.)
link over the old one instead of renaming the old file and renaming it back.
author | Rob Landley <rob@landley.net> |
---|---|
date | Wed, 22 Oct 2014 17:11:06 -0500 |
parents | 53f165466f3b |
children | 685a0da6ca59 |
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/* who.c - display who is on the system * * Copyright 2012 ProFUSION Embedded Systems * * by Luis Felipe Strano Moraes <lfelipe@profusion.mobi> * * See http://opengroup.org/onlinepubs/9699919799/utilities/who.html * * Posix says to support many options (-abdHlmpqrstTu) but this * isn't aimed at minicomputers with modem pools. USE_WHO(NEWTOY(who, "a", TOYFLAG_BIN)) config WHO bool "who" default y help usage: who Print logged user information on system */ #define FOR_who #include "toys.h" void who_main(void) { struct utmpx *entry; setutxent(); while ((entry = getutxent())) { if ((toys.optflags & FLAG_a) || entry->ut_type == USER_PROCESS) { time_t time; int time_size; char *times; time = entry->ut_tv.tv_sec; times = ctime(&time); time_size = strlen(times) - 2; printf("%s\t%s\t%*.*s\t(%s)\n", entry->ut_user, entry->ut_line, time_size, time_size, ctime(&time), entry->ut_host); } } endutxent(); }