diff options
| -rw-r--r-- | src/Makefile.am | 1 | ||||
| -rw-r--r-- | src/hooks.c | 113 | ||||
| -rw-r--r-- | src/hooks.h | 29 | ||||
| -rw-r--r-- | src/redshift.c | 19 |
4 files changed, 162 insertions, 0 deletions
diff --git a/src/Makefile.am b/src/Makefile.am index 8d11a03..c7a5444 100644 --- a/src/Makefile.am +++ b/src/Makefile.am @@ -15,6 +15,7 @@ redshift_SOURCES = \ location-manual.c location-manual.h \ solar.c solar.h \ systemtime.c systemtime.h \ + hooks.c hooks.h \ gamma-dummy.c gamma-dummy.h EXTRA_redshift_SOURCES = \ diff --git a/src/hooks.c b/src/hooks.c new file mode 100644 index 0000000..d051c4b --- /dev/null +++ b/src/hooks.c @@ -0,0 +1,113 @@ +/* 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 "hooks.h" +#include "redshift.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 + } +} diff --git a/src/hooks.h b/src/hooks.h new file mode 100644 index 0000000..fd1c2f0 --- /dev/null +++ b/src/hooks.h @@ -0,0 +1,29 @@ +/* hooks.h -- 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> +*/ + +#ifndef REDSHIFT_HOOKS_H +#define REDSHIFT_HOOKS_H + +#include "redshift.h" + +void hooks_signal_period_change(period_t prev_period, + period_t period); + + +#endif /* ! REDSHIFT_HOOKS_H */ diff --git a/src/redshift.c b/src/redshift.c index 11b7f34..c1fc259 100644 --- a/src/redshift.c +++ b/src/redshift.c @@ -48,6 +48,7 @@ #include "config-ini.h" #include "solar.h" #include "systemtime.h" +#include "hooks.h" #define MIN(x,y) ((x) < (y) ? (x) : (y)) @@ -1422,6 +1423,18 @@ main(int argc, char *argv[]) perror("sigaction"); exit(EXIT_FAILURE); } + + /* Ignore CHLD signal. This causes child processes + (hooks) to be reaped automatically. */ + sigact.sa_handler = SIG_IGN; + sigact.sa_mask = sigset; + sigact.sa_flags = 0; + + r = sigaction(SIGCHLD, &sigact, NULL); + if (r < 0) { + perror("sigaction"); + exit(EXIT_FAILURE); + } #endif /* HAVE_SIGNAL_H && ! __WIN32__ */ if (verbose) { @@ -1517,6 +1530,12 @@ main(int argc, char *argv[]) print_period(period, transition); } + /* Activate hooks if period changed */ + if (period != prev_period) { + hooks_signal_period_change(prev_period, + period); + } + /* Ongoing short transition */ if (short_trans_delta) { /* Calculate alpha */ |