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safer forking, reduce duplicate code, cleanup zombie processes

This commit is contained in:
Taiyu 2015-08-12 21:06:09 -07:00
parent 0f387483fd
commit 65406cb61b
1 changed files with 48 additions and 34 deletions
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82
sway/commands.c
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@ -5,6 +5,7 @@
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/wait.h>
#include <ctype.h>
#include "stringop.h"
#include "layout.h"
@ -29,6 +30,8 @@ struct modifier_key modifiers[] = {
{ "Mod5", WLC_BIT_MOD_MOD5 },
};
bool cmd_bindsym(struct sway_config *config, int argc, char **argv) {
if (argc < 2) {
sway_log(L_ERROR, "Invalid set command (expected 2 arguments, got %d)", argc);
@ -73,44 +76,55 @@ bool cmd_bindsym(struct sway_config *config, int argc, char **argv) {
return true;
}
bool cmd_exec(struct sway_config *config, int argc, char **argv) {
static void cmd_exec_cleanup(int signal) {
while (waitpid((pid_t)-1, 0, WNOHANG) > 0){};
}
static bool cmd_exec_always(struct sway_config *config, int argc, char **argv) {
/* setup signal handler to cleanup dead proccesses */
/* TODO: replace this with a function that has constructor attribute? */
static bool cleanup = false;
if(cleanup == false) {
signal(SIGCHLD, cmd_exec_cleanup);
cleanup = true;
}
if (argc < 1) {
sway_log(L_ERROR, "Invalid exec command (expected at least 1 argument, got %d)", argc);
return false;
}
if (config->reloading) {
sway_log(L_DEBUG, "Ignoring exec %s due to reload", join_args(argv, argc));
return true;
}
if (fork() == 0) {
char *args = join_args(argv, argc);
sway_log(L_DEBUG, "Executing %s", args);
execl("/bin/sh", "sh", "-c", args, (char *)NULL);
free(args);
exit(0);
}
return true;
}
bool cmd_exec_always(struct sway_config *config, int argc, char **argv) {
if (argc < 1) {
sway_log(L_ERROR, "Invalid exec_always command (expected at least 1 argument, got %d)", argc);
pid_t pid = fork();
/* Failed to fork */
if (pid < 0) {
sway_log(L_ERROR, "exec command failed, sway did not fork");
return false;
}
if (fork() == 0) {
/* Child process */
if (pid == 0) {
char *args = join_args(argv, argc);
sway_log(L_DEBUG, "Executing %s", args);
execl("/bin/sh", "sh", "-c", args, (char *)NULL);
/* Execl doesnt return unless failure */
sway_log(L_ERROR, "could not find /bin/sh");
free(args);
exit(0);
exit(-1);
}
/* Parent */
return true;
}
bool cmd_exit(struct sway_config *config, int argc, char **argv) {
static bool cmd_exec(struct sway_config *config, int argc, char **argv) {
if (config->reloading) {
char *args = join_args(argv, argc);
sway_log(L_DEBUG, "Ignoring exec %s due to reload", args);
free(args);
return true;
}
return cmd_exec_always(config, argc, argv);
}
static bool cmd_exit(struct sway_config *config, int argc, char **argv) {
if (argc != 0) {
sway_log(L_ERROR, "Invalid exit command (expected 1 arguments, got %d)", argc);
return false;
@ -120,7 +134,7 @@ bool cmd_exit(struct sway_config *config, int argc, char **argv) {
return true;
}
bool cmd_focus(struct sway_config *config, int argc, char **argv) {
static bool cmd_focus(struct sway_config *config, int argc, char **argv) {
if (argc != 1) {
sway_log(L_ERROR, "Invalid focus command (expected 1 arguments, got %d)", argc);
return false;
@ -139,7 +153,7 @@ bool cmd_focus(struct sway_config *config, int argc, char **argv) {
return true;
}
bool cmd_focus_follows_mouse(struct sway_config *config, int argc, char **argv) {
static bool cmd_focus_follows_mouse(struct sway_config *config, int argc, char **argv) {
if (argc != 1) {
sway_log(L_ERROR, "Invalid focus_follows_mouse command (expected 1 arguments, got %d)", argc);
return false;
@ -149,7 +163,7 @@ bool cmd_focus_follows_mouse(struct sway_config *config, int argc, char **argv)
return true;
}
bool cmd_layout(struct sway_config *config, int argc, char **argv) {
static bool cmd_layout(struct sway_config *config, int argc, char **argv) {
if (argc < 1) {
sway_log(L_ERROR, "Invalid layout command (expected at least 1 argument, got %d)", argc);
return false;
@ -174,7 +188,7 @@ bool cmd_layout(struct sway_config *config, int argc, char **argv) {
return true;
}
bool cmd_reload(struct sway_config *config, int argc, char **argv) {
static bool cmd_reload(struct sway_config *config, int argc, char **argv) {
if (argc != 0) {
sway_log(L_ERROR, "Invalid reload command (expected 0 arguments, got %d)", argc);
return false;
@ -186,7 +200,7 @@ bool cmd_reload(struct sway_config *config, int argc, char **argv) {
return true;
}
bool cmd_set(struct sway_config *config, int argc, char **argv) {
static bool cmd_set(struct sway_config *config, int argc, char **argv) {
if (argc != 2) {
sway_log(L_ERROR, "Invalid set command (expected 2 arguments, got %d)", argc);
return false;
@ -200,7 +214,7 @@ bool cmd_set(struct sway_config *config, int argc, char **argv) {
return true;
}
bool _do_split(struct sway_config *config, int argc, char **argv, int layout) {
static bool _do_split(struct sway_config *config, int argc, char **argv, int layout) {
if (argc != 0) {
sway_log(L_ERROR, "Invalid splitv command (expected 0 arguments, got %d)", argc);
return false;
@ -225,15 +239,15 @@ bool _do_split(struct sway_config *config, int argc, char **argv, int layout) {
return true;
}
bool cmd_splitv(struct sway_config *config, int argc, char **argv) {
static bool cmd_splitv(struct sway_config *config, int argc, char **argv) {
return _do_split(config, argc, argv, L_VERT);
}
bool cmd_splith(struct sway_config *config, int argc, char **argv) {
static bool cmd_splith(struct sway_config *config, int argc, char **argv) {
return _do_split(config, argc, argv, L_HORIZ);
}
bool cmd_log_colors(struct sway_config *config, int argc, char **argv) {
static bool cmd_log_colors(struct sway_config *config, int argc, char **argv) {
if (argc != 1) {
sway_log(L_ERROR, "Invalid log_colors command (expected 1 argument, got %d)", argc);
return false;
@ -248,7 +262,7 @@ bool cmd_log_colors(struct sway_config *config, int argc, char **argv) {
return true;
}
bool cmd_fullscreen(struct sway_config *config, int argc, char **argv) {
static bool cmd_fullscreen(struct sway_config *config, int argc, char **argv) {
if (argc != 1) {
sway_log(L_ERROR, "Invalid fullscreen command (expected 1 arguments, got %d)", argc);
return false;
@ -262,7 +276,7 @@ bool cmd_fullscreen(struct sway_config *config, int argc, char **argv) {
return true;
}
bool cmd_workspace(struct sway_config *config, int argc, char **argv) {
static bool cmd_workspace(struct sway_config *config, int argc, char **argv) {
if (argc != 1) {
sway_log(L_ERROR, "Invalid workspace command (expected 1 arguments, got %d)", argc);
return false;