Import from to be retired launchutils repo (without history).
Dieser Commit ist enthalten in:
Commit
6303374cc3
5
Makefile
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5
Makefile
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@ -0,0 +1,5 @@
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CFLAGS=-Wall -Wextra -pedantic -std=c99 -march=native -O3
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all: afkcron
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afkcron: afkcron.c
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$(CC) ${CFLAGS} afkcron.c -lX11 -lXss -o afkcron
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498
afkcron.c
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498
afkcron.c
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/*
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* afkcron launches a program depending on the time the user is not using his machine
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*
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* Copyright (c) 2014-2017 Albert S. <launchutils at quitesimple dot org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#define _XOPEN_SOURCE 700
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <signal.h>
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#include <stdbool.h>
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#include <stdarg.h>
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#include <time.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <X11/Xlib.h>
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#include <X11/extensions/scrnsaver.h>
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#include <ctype.h>
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#define CONFIG_DEFAULT_PATH "/etc/afkcron"
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#define CONFIG_DELIMER ':'
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//return actions flags
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#define FLAG_RETURN_KILL (1 << 0)
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#define FLAG_RETURN_PRIO (1 << 1)
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#define FLAG_RETURN_STOP (1 << 2)
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#define FLAG_RETURN_STAY (1 << 3)
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#define FLAG_RETURN_TERM (1 << 4)
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#define FLAG_RETURN_TERMKILL (FLAG_RETURN_TERM | FLAG_RETURN_KILL)
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//general flags
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#define FLAG_SINGLE_SHOT (1 << 0) // fire only once during program lifetime
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//consider merging return action flags and general flags
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struct entry
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{
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pid_t pid; // 0 = can be ran, -1 single shot entry which finished, pid > 0 = currently running
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bool stopped;
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const char *path;
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const char *args;
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int comeback_action; //What to do, when the user returns, starts using the computer again?
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int idle_seconds;
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int flags;
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struct entry *next;
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};
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FILE *logfp = NULL;
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struct entry *head_entry = NULL;
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struct entry *tail_entry = NULL;
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void *xmalloc(size_t n)
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{
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char *tmp = malloc(n);
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if(tmp == NULL)
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{
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perror("malloc");
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exit(EXIT_FAILURE);
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}
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return tmp;
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}
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void *xstrdup(const char *str)
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{
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char *result = strdup(str);
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if(result == NULL)
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{
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perror("strdup");
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exit(EXIT_FAILURE);
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}
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return result;
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}
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bool strempty(const char *str)
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{
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return str == NULL || *str == '\0';
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}
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int strcnt(const char *str, const char c)
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{
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int result = 0;
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while(*str)
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if(*str++ == c) ++result;
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return result;
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}
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int split_string(char ***out, const char *str, char delim)
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{
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int current = 0;
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int items = strcnt(str, delim) + 1;
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*out = xmalloc(items * sizeof(char *));
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char *temp = xstrdup(str);
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char *portion = temp;
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while(*temp)
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{
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if(*temp == delim)
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{
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*temp=0;
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(*out)[current] = portion;
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++current;
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portion = temp+1;
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}
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++temp;
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}
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(*out)[current] = portion;
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return ++current;
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}
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const char **create_execv_args(const char *name, const char *str, char delim)
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{
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if(strempty(name))
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return NULL;
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const char **result = NULL;
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if(strempty(str))
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{
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result = xmalloc(2 * sizeof(char *));
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result[0] = name;
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result[1] = NULL;
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}
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else
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{
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int items=2;
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char **args = NULL;
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int n_args = split_string(&args, str, delim);
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items += n_args;
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result = xmalloc(items * sizeof(char *));
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result[0] = name;
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for(int i=0; i < n_args; i++)
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result[i+1] = args[i];
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result[items-1] = NULL;
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}
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return result;
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}
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void print_err_and_exit(const char *s)
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{
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fputs(s, stderr);
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exit(EXIT_FAILURE);
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}
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void perror_and_exit(const char *s)
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{
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perror(s);
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exit(EXIT_FAILURE);
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}
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void logit(const char *format, ...)
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{
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if(logfp != NULL)
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{
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va_list args;
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va_start(args, format);
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time_t now = time(0);
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char *timestr = ctime(&now);
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size_t len = strlen(timestr);
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if(timestr[len-1] == '\n')
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{
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timestr[len-1] = 0;
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}
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fprintf(logfp, "%s: ", timestr);
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vfprintf(logfp, format, args);
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fflush(logfp);
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va_end(args);
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}
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}
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int get_idle_seconds(Display *display)
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{
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XScreenSaverInfo info;
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if(XScreenSaverQueryInfo(display, DefaultRootWindow(display), &info) == 0)
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return -1;
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return info.idle / 1000;
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}
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void add_entry(struct entry *e)
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{
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if(head_entry == NULL)
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head_entry = e;
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if(tail_entry != NULL)
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tail_entry->next = e;
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tail_entry = e;
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}
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int comeback_action_from_string(const char *str)
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{
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int result = 0;
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if(! strempty(str))
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{
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if(strcmp(str, "kill") == 0)
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result |= FLAG_RETURN_KILL;
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else if(strcmp(str, "stop") == 0)
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result |= FLAG_RETURN_STOP;
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else if(strcmp(str, "prio") == 0)
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result |= FLAG_RETURN_PRIO;
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else if(strcmp(str, "term") == 0)
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result |= FLAG_RETURN_TERM;
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else if(strcmp(str, "termkill") == 0)
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result |= FLAG_RETURN_TERMKILL;
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else
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result |= FLAG_RETURN_STAY;
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}
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return result;
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}
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int flags_from_string(const char *str)
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{
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int result = 0;
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if(strstr(str, "oneshot"))
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result |= FLAG_SINGLE_SHOT;
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return result;
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}
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//TODO: check integer overflow
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int secs_from_string(char *unitstr)
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{
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if(unitstr == NULL)
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return -1;
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size_t len = strlen(unitstr);
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char unit = unitstr[len-1];
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if(! isdigit(unit))
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unitstr[len-1] = '\0';
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int secs = atoi(unitstr);
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if(secs < 0)
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return -1;
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switch(unit)
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{
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case 'd':
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secs *= 24;
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case 'h':
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secs *= 60;
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case 'm':
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secs *= 60;
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}
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return secs;
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}
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struct entry *entry_from_line(const char *line)
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{
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char *l = xstrdup(line);
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char **fields = NULL;
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int n_fields = split_string(&fields, l, CONFIG_DELIMER);
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if(n_fields < 5)
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return NULL;
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struct entry *result = xmalloc(sizeof(struct entry));
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result->path = fields[0];
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result->args = fields[1];
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result->comeback_action = comeback_action_from_string(fields[2]);
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result->idle_seconds = secs_from_string(fields[3]);
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result->flags = flags_from_string(fields[4]);
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return result;
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}
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static inline bool check_entry(struct entry *e)
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{
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return ( ! strempty(e->path) ) && ( e->idle_seconds > 0 ) && ( e->comeback_action > 0 );
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}
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void read_config(const char *configfile)
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{
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FILE *fp = fopen(configfile, "r");
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if(fp == NULL)
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{
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perror_and_exit("fopen");
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}
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char *line;
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size_t n = 0;
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ssize_t r;
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while((r = getline(&line, &n, fp)) != -1 )
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{
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if(line[r-1] == '\n')
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line[r-1] = '\0';
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struct entry *e = entry_from_line(line);
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if(e == NULL)
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print_err_and_exit("error reading from file");
|
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if(! check_entry(e))
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print_err_and_exit("Invalid values for entry");
|
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add_entry(e);
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||||
|
||||
|
||||
}
|
||||
|
||||
if(ferror(fp))
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perror_and_exit("error reading from config file");
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fclose(fp);
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}
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void handle_comeback()
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{
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for(struct entry *current = head_entry; current != NULL; current = current->next)
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{
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if(current->pid > 0)
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{
|
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int comeback_action = current->comeback_action;
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bool wants_term = (comeback_action & FLAG_RETURN_TERM) == FLAG_RETURN_TERM;
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|
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if(wants_term)
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{
|
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logit("Terminating %z\n", current->pid);
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||||
kill(current->pid, SIGTERM);
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}
|
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|
||||
if(comeback_action & FLAG_RETURN_KILL)
|
||||
{
|
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if(wants_term)
|
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while(sleep(2));
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if(kill(current->pid, SIGKILL) == 0)
|
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{
|
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logit("Killed %z\n", current->pid);
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||||
current->pid = 0;
|
||||
}
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||||
//TODO: and if fail?...
|
||||
}
|
||||
if(comeback_action & FLAG_RETURN_STOP)
|
||||
{
|
||||
if(kill(current->pid, SIGSTOP) == 0)
|
||||
{
|
||||
logit("Stopped %z\n", current->pid);
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||||
current->stopped = true;
|
||||
//TODO: ...
|
||||
}
|
||||
}
|
||||
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||||
if(comeback_action & FLAG_RETURN_PRIO)
|
||||
{
|
||||
logit("Lowering priority for %z\n", current->pid);
|
||||
setpriority(PRIO_PROCESS, current->pid, 19);
|
||||
//TODO: IO prio?
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
}
|
||||
|
||||
void handle_finished_pid(pid_t pid)
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||||
{
|
||||
for(struct entry *current = head_entry; current != NULL; current = current->next)
|
||||
{
|
||||
if(current->pid == pid)
|
||||
{
|
||||
if( (current->flags & FLAG_SINGLE_SHOT) )
|
||||
{
|
||||
current->pid = -1;
|
||||
}
|
||||
else
|
||||
current->pid = 0;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
void child_handler(int signum, siginfo_t *info, void *context)
|
||||
{
|
||||
if(signum != SIGCHLD)
|
||||
return;
|
||||
|
||||
pid_t pid = info->si_pid;
|
||||
//TODO
|
||||
int status;
|
||||
int x = waitpid(pid, &status, WNOHANG);
|
||||
if(x == -1)
|
||||
print_err_and_exit("waitpid failed");
|
||||
handle_finished_pid(pid);
|
||||
|
||||
|
||||
}
|
||||
void set_signals()
|
||||
{
|
||||
struct sigaction action;
|
||||
action.sa_flags = SA_NOCLDSTOP | SA_SIGINFO;
|
||||
action.sa_sigaction = &child_handler;
|
||||
if(sigaction(SIGCHLD, &action, NULL) == -1)
|
||||
print_err_and_exit("sigaction failed");
|
||||
}
|
||||
|
||||
|
||||
bool run_entry(struct entry *e)
|
||||
{
|
||||
const char **args = create_execv_args(e->path, e->args, ' ');
|
||||
pid_t child = fork();
|
||||
if(child == 0)
|
||||
{
|
||||
logit("Starting execution of %s\n", e->path);
|
||||
execv(e->path, (char * const *)args);
|
||||
fclose(logfp);
|
||||
}
|
||||
else if(child > 0)
|
||||
e->pid = child;
|
||||
return child != -1;
|
||||
}
|
||||
|
||||
void run_entries(int idle_seconds)
|
||||
{
|
||||
for(struct entry *e = head_entry; e != NULL; e = e->next)
|
||||
{
|
||||
if(e->idle_seconds > idle_seconds)
|
||||
continue;
|
||||
if(e->pid == 0)
|
||||
run_entry(e);
|
||||
if(e->pid > 0 && e->stopped)
|
||||
{
|
||||
logit("Continuing %z\n", e->pid);
|
||||
if(kill(e->pid, SIGCONT) == 0)
|
||||
e->stopped = false;
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
|
||||
int main(int argc, char *argv[])
|
||||
{
|
||||
Display *display = XOpenDisplay(NULL);
|
||||
if(display == NULL)
|
||||
print_err_and_exit("Couldn't open DISPLAY");
|
||||
|
||||
|
||||
int event_base, error_base;
|
||||
|
||||
if (! XScreenSaverQueryExtension(display, &event_base, &error_base))
|
||||
print_err_and_exit("No XScreenSaver Extension available on this display");
|
||||
|
||||
set_signals();
|
||||
|
||||
|
||||
|
||||
|
||||
int option;
|
||||
while((option = getopt(argc, argv, "c:l:")) != -1)
|
||||
{
|
||||
switch(option)
|
||||
{
|
||||
case 'c':
|
||||
read_config(optarg);
|
||||
break;
|
||||
case 'l':
|
||||
logfp = fopen(optarg, "a");
|
||||
if(logfp == NULL)
|
||||
{
|
||||
print_err_and_exit("Error opening log file");
|
||||
}
|
||||
break;
|
||||
|
||||
}
|
||||
}
|
||||
if(head_entry == NULL)
|
||||
{
|
||||
read_config(CONFIG_DEFAULT_PATH);
|
||||
}
|
||||
int previous_seconds = 0;
|
||||
while(1)
|
||||
{
|
||||
int idle_seconds = get_idle_seconds(display);
|
||||
if(idle_seconds == -1)
|
||||
print_err_and_exit("X11 Screen Saver Extension not supported?");
|
||||
|
||||
if(previous_seconds > idle_seconds)
|
||||
handle_comeback();
|
||||
else
|
||||
run_entries(idle_seconds);
|
||||
|
||||
previous_seconds = idle_seconds;
|
||||
while(sleep(10)); // Well this sleep approach is suboptimal, do it with events somehow if possible.
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
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