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/* hooks.c -- Hooks triggered by events
This file is part of Redshift.
Redshift is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Redshift is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Redshift. If not, see <http://www.gnu.org/licenses/>.
Copyright (c) 2014 Jon Lund Steffensen <jonlst@gmail.com>
*/
#include <stdlib.h>
#include <sys/types.h>
#include <dirent.h>
#include <unistd.h>
#include <errno.h>
#ifndef _WIN32
# include <pwd.h>
#endif
#include "common.h"
#define MAX_HOOK_PATH 4096
/* Names of periods supplied to scripts. */
static const char *period_names[] = {
"none",
"daytime",
"night",
"transition"
};
/* Try to open the directory containing hooks. HP is a string
of MAX_HOOK_PATH length that will be filled with the path
of the returned directory. */
static DIR *
open_hooks_dir(char *hp)
{
char *env;
if ((env = getenv("XDG_CONFIG_HOME")) != NULL &&
env[0] != '\0') {
snprintf(hp, MAX_HOOK_PATH, "%s/redshift/hooks", env);
return opendir(hp);
}
if ((env = getenv("HOME")) != NULL &&
env[0] != '\0') {
snprintf(hp, MAX_HOOK_PATH, "%s/.config/redshift/hooks", env);
return opendir(hp);
}
#ifndef _WIN32
struct passwd *pwd = getpwuid(getuid());
snprintf(hp, MAX_HOOK_PATH, "%s/.config/redshift/hooks", pwd->pw_dir);
return opendir(hp);
#else
return NULL;
#endif
}
/* Run hooks with a signal that the period changed. */
void
hooks_signal_period_change(period_t prev_period, period_t period)
{
char hooksdir_path[MAX_HOOK_PATH];
DIR *hooks_dir = open_hooks_dir(hooksdir_path);
if (hooks_dir == NULL) return;
struct dirent* ent;
while ((ent = readdir(hooks_dir)) != NULL) {
/* Skip hidden and special files (., ..) */
if (ent->d_name[0] == '\0' || ent->d_name[0] == '.') continue;
char *hook_name = ent->d_name;
char hook_path[MAX_HOOK_PATH];
snprintf(hook_path, sizeof(hook_path), "%s/%s",
hooksdir_path, hook_name);
#ifndef _WIN32
/* Fork and exec the hook. We close stdout
so the hook cannot interfere with the normal
output. */
pid_t pid = fork();
if (pid == (pid_t)-1) {
perror("fork");
continue;
} else if (pid == 0) { /* Child */
close(STDOUT_FILENO);
int r = execl(hook_path, hook_name,
"period-changed",
period_names[prev_period],
period_names[period], NULL);
if (r < 0 && errno != EACCES) perror("execl");
/* Only reached on error */
_exit(EXIT_FAILURE);
}
#endif
}
}
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