mirror of
https://github.com/troglobit/finit.git
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Tobias Waldekranz
b0663d04e4
TIL, using mtimes for tracking event orderings is a monumentally bad idea (queue the nodding UNIX-beards). Mtimes are in wallclock time which is not necessarily monotonically increasing. A user may adjust the time, an NTP daemon will continously tune the clock and so on. Instead, store an explicit generation number in each condition file, which will be monotonically increased by finit on each reconf.
127 lines
2.8 KiB
C
127 lines
2.8 KiB
C
/* Condition engine (read)
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*
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* Copyright (c) 2015-2016 Tobias Waldekranz <tobias@waldekranz.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <lite/lite.h>
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#include <stdio.h>
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#include "finit.h"
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#include "cond.h"
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#include "service.h"
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const char *condstr(enum cond_state s)
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{
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static const char *strs[] = {
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[COND_OFF] = "off",
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[COND_FLUX] = "flux",
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[COND_ON] = "on",
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};
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return strs[s];
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}
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const char *cond_path(const char *name)
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{
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static char file[MAX_ARG_LEN];
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snprintf(file, sizeof(file), COND_PATH "/%s", name);
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return file;
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}
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unsigned int cond_get_gen(const char *path)
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{
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unsigned int gen;
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FILE *fp;
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int ret;
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fp = fopen(path, "r");
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if (!fp)
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return 0;
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ret = fscanf(fp, "%u", &gen);
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fclose(fp);
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return (ret == 1) ? gen : 0;
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}
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enum cond_state cond_get_path(const char *path)
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{
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int cgen, rgen;
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rgen = cond_get_gen(COND_RECONF);
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if (!rgen)
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return COND_OFF;
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cgen = cond_get_gen(path);
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if (!cgen)
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return COND_OFF;
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return (cgen == rgen) ? COND_ON : COND_FLUX;
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}
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enum cond_state cond_get(const char *name)
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{
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return cond_get_path(cond_path(name));
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}
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enum cond_state cond_get_agg(const char *names)
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{
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char *cond;
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enum cond_state s = COND_ON;
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static char conds[MAX_ARG_LEN];
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if (!names)
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return COND_ON;
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strlcpy(conds, names, sizeof(conds));
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for (cond = strtok(conds, ","); s && cond; cond = strtok(NULL, ","))
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s = min(s, cond_get(cond));
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return s;
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}
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int cond_affects(const char *name, const char *names)
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{
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char *cond;
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static char conds[MAX_ARG_LEN];
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if (!name || !names)
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return 0;
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strlcpy(conds, names, sizeof(conds));
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for (cond = strtok(conds, ","); cond; cond = strtok(NULL, ",")) {
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if (!strcmp(cond, name))
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return 1;
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}
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return 0;
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}
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/**
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* Local Variables:
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* indent-tabs-mode: t
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* c-file-style: "linux"
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* End:
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*/
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