+#undef I3__FILE__
+#define I3__FILE__ "util.c"
/*
* vim:ts=4:sw=4:expandtab
*
* i3 - an improved dynamic tiling window manager
+ * © 2009-2011 Michael Stapelberg and contributors (see also: LICENSE)
*
- * © 2009-2011 Michael Stapelberg and contributors
- *
- * See file LICENSE for license information.
- *
- * util.c: Utility functions, which can be useful everywhere.
+ * util.c: Utility functions, which can be useful everywhere within i3 (see
+ * also libi3).
*
*/
+#include "all.h"
+
#include <sys/wait.h>
#include <stdarg.h>
-#include <iconv.h>
#if defined(__OpenBSD__)
#include <sys/cdefs.h>
#endif
#include <fcntl.h>
#include <pwd.h>
#include <yajl/yajl_version.h>
+#include <libgen.h>
-#include "all.h"
-
-static iconv_t conversion_descriptor = 0;
+#define SN_API_NOT_YET_FROZEN 1
+#include <libsn/sn-launcher.h>
int min(int a, int b) {
return (a < b ? a : b);
}
/*
- * The s* functions (safe) are wrappers around malloc, strdup, …, which exits if one of
- * the called functions returns NULL, meaning that there is no more memory available
+ * exec()s an i3 utility, for example the config file migration script or
+ * i3-nagbar. This function first searches $PATH for the given utility named,
+ * then falls back to the dirname() of the i3 executable path and then falls
+ * back to the dirname() of the target of /proc/self/exe (on linux).
*
- */
-void *smalloc(size_t size) {
- void *result = malloc(size);
- exit_if_null(result, "Error: out of memory (malloc(%zd))\n", size);
- return result;
-}
-
-void *scalloc(size_t size) {
- void *result = calloc(size, 1);
- exit_if_null(result, "Error: out of memory (calloc(%zd))\n", size);
- return result;
-}
-
-void *srealloc(void *ptr, size_t size) {
- void *result = realloc(ptr, size);
- exit_if_null(result, "Error: out memory (realloc(%zd))\n", size);
- return result;
-}
-
-char *sstrdup(const char *str) {
- char *result = strdup(str);
- exit_if_null(result, "Error: out of memory (strdup())\n");
- return result;
-}
-
-/*
- * Starts the given application by passing it through a shell. We use double fork
- * to avoid zombie processes. As the started application’s parent exits (immediately),
- * the application is reparented to init (process-id 1), which correctly handles
- * childs, so we don’t have to do it :-).
+ * This function should be called after fork()ing.
+ *
+ * The first argument of the given argv vector will be overwritten with the
+ * executable name, so pass NULL.
*
- * The shell is determined by looking for the SHELL environment variable. If it
- * does not exist, /bin/sh is used.
+ * If the utility cannot be found in any of these locations, it exits with
+ * return code 2.
*
*/
-void start_application(const char *command) {
- LOG("executing: %s\n", command);
- if (fork() == 0) {
- /* Child process */
- setsid();
- if (fork() == 0) {
- /* Stores the path of the shell */
- static const char *shell = NULL;
-
- if (shell == NULL)
- if ((shell = getenv("SHELL")) == NULL)
- shell = "/bin/sh";
-
- /* This is the child */
- execl(shell, shell, "-c", command, (void*)NULL);
- /* not reached */
- }
- exit(0);
+void exec_i3_utility(char *name, char *argv[]) {
+ /* start the migration script, search PATH first */
+ char *migratepath = name;
+ argv[0] = migratepath;
+ execvp(migratepath, argv);
+
+ /* if the script is not in path, maybe the user installed to a strange
+ * location and runs the i3 binary with an absolute path. We use
+ * argv[0]’s dirname */
+ char *pathbuf = strdup(start_argv[0]);
+ char *dir = dirname(pathbuf);
+ sasprintf(&migratepath, "%s/%s", dir, name);
+ argv[0] = migratepath;
+ execvp(migratepath, argv);
+
+#if defined(__linux__)
+ /* on linux, we have one more fall-back: dirname(/proc/self/exe) */
+ char buffer[BUFSIZ];
+ if (readlink("/proc/self/exe", buffer, BUFSIZ) == -1) {
+ warn("could not read /proc/self/exe");
+ _exit(1);
}
- wait(0);
+ dir = dirname(buffer);
+ sasprintf(&migratepath, "%s/%s", dir, name);
+ argv[0] = migratepath;
+ execvp(migratepath, argv);
+#endif
+
+ warn("Could not start %s", name);
+ _exit(2);
}
/*
}
}
-/*
- * Converts the given string to UCS-2 big endian for use with
- * xcb_image_text_16(). The amount of real glyphs is stored in real_strlen,
- * a buffer containing the UCS-2 encoded string (16 bit per glyph) is
- * returned. It has to be freed when done.
- *
- */
-char *convert_utf8_to_ucs2(char *input, int *real_strlen) {
- size_t input_size = strlen(input) + 1;
- /* UCS-2 consumes exactly two bytes for each glyph */
- int buffer_size = input_size * 2;
-
- char *buffer = smalloc(buffer_size);
- size_t output_size = buffer_size;
- /* We need to use an additional pointer, because iconv() modifies it */
- char *output = buffer;
-
- /* We convert the input into UCS-2 big endian */
- if (conversion_descriptor == 0) {
- conversion_descriptor = iconv_open("UCS-2BE", "UTF-8");
- if (conversion_descriptor == 0) {
- fprintf(stderr, "error opening the conversion context\n");
- exit(1);
- }
- }
-
- /* Get the conversion descriptor back to original state */
- iconv(conversion_descriptor, NULL, NULL, NULL, NULL);
-
- /* Convert our text */
- int rc = iconv(conversion_descriptor, (void*)&input, &input_size, &output, &output_size);
- if (rc == (size_t)-1) {
- perror("Converting to UCS-2 failed");
- if (real_strlen != NULL)
- *real_strlen = 0;
- return NULL;
- }
-
- if (real_strlen != NULL)
- *real_strlen = ((buffer_size - output_size) / 2) - 1;
-
- return buffer;
-}
-
/*
* This function resolves ~ in pathnames.
* It may resolve wildcards in the first part of the path, but if no match
return result;
}
-/*
- * Returns the name of a temporary file with the specified prefix.
- *
- */
-char *get_process_filename(const char *prefix) {
- char *dir = getenv("XDG_RUNTIME_DIR");
- if (dir == NULL) {
- struct passwd *pw = getpwuid(getuid());
- const char *username = pw ? pw->pw_name : "unknown";
- if (asprintf(&dir, "/tmp/i3-%s", username) == -1) {
- perror("asprintf()");
- return NULL;
- }
- } else {
- char *tmp;
- if (asprintf(&tmp, "%s/i3", dir) == -1) {
- perror("asprintf()");
- return NULL;
- }
- dir = tmp;
- }
- if (!path_exists(dir)) {
- if (mkdir(dir, 0700) == -1) {
- perror("mkdir()");
- return NULL;
- }
- }
- char *filename;
- if (asprintf(&filename, "%s/%s.%d", dir, prefix, getpid()) == -1) {
- perror("asprintf()");
- filename = NULL;
- }
-
- free(dir);
- return filename;
-}
-
#define y(x, ...) yajl_gen_ ## x (gen, ##__VA_ARGS__)
#define ystr(str) yajl_gen_string(gen, (unsigned char*)str, strlen(str))
-char *store_restart_layout() {
+char *store_restart_layout(void) {
setlocale(LC_NUMERIC, "C");
#if YAJL_MAJOR >= 2
yajl_gen gen = yajl_gen_alloc(NULL);
if (n == -1) {
perror("write()");
free(filename);
+ close(fd);
return NULL;
}
if (n == 0) {
printf("write == 0?\n");
free(filename);
+ close(fd);
return NULL;
}
written += n;
void i3_restart(bool forget_layout) {
char *restart_filename = forget_layout ? NULL : store_restart_layout();
+ kill_nagbar(&config_error_nagbar_pid, true);
+ kill_nagbar(&command_error_nagbar_pid, true);
+
restore_geometry();
ipc_shutdown();
/* not reached */
}
-#if 0
-
-#if defined(__OpenBSD__)
+#if defined(__OpenBSD__) || defined(__APPLE__)
/*
* Taken from FreeBSD
*
*/
void *memmem(const void *l, size_t l_len, const void *s, size_t s_len) {
- register char *cur, *last;
- const char *cl = (const char *)l;
- const char *cs = (const char *)s;
+ register char *cur, *last;
+ const char *cl = (const char *)l;
+ const char *cs = (const char *)s;
- /* we need something to compare */
- if (l_len == 0 || s_len == 0)
- return NULL;
+ /* we need something to compare */
+ if (l_len == 0 || s_len == 0)
+ return NULL;
- /* "s" must be smaller or equal to "l" */
- if (l_len < s_len)
- return NULL;
+ /* "s" must be smaller or equal to "l" */
+ if (l_len < s_len)
+ return NULL;
- /* special case where s_len == 1 */
- if (s_len == 1)
- return memchr(l, (int)*cs, l_len);
+ /* special case where s_len == 1 */
+ if (s_len == 1)
+ return memchr(l, (int)*cs, l_len);
- /* the last position where its possible to find "s" in "l" */
- last = (char *)cl + l_len - s_len;
+ /* the last position where its possible to find "s" in "l" */
+ last = (char *)cl + l_len - s_len;
- for (cur = (char *)cl; cur <= last; cur++)
- if (cur[0] == cs[0] && memcmp(cur, cs, s_len) == 0)
- return cur;
+ for (cur = (char *)cl; cur <= last; cur++)
+ if (cur[0] == cs[0] && memcmp(cur, cs, s_len) == 0)
+ return cur;
- return NULL;
+ return NULL;
}
#endif
-#endif
+
+/*
+ * Handler which will be called when we get a SIGCHLD for the nagbar, meaning
+ * it exited (or could not be started, depending on the exit code).
+ *
+ */
+static void nagbar_exited(EV_P_ ev_child *watcher, int revents) {
+ ev_child_stop(EV_A_ watcher);
+
+ if (!WIFEXITED(watcher->rstatus)) {
+ ELOG("ERROR: i3-nagbar did not exit normally.\n");
+ return;
+ }
+
+ int exitcode = WEXITSTATUS(watcher->rstatus);
+ DLOG("i3-nagbar process exited with status %d\n", exitcode);
+ if (exitcode == 2) {
+ ELOG("ERROR: i3-nagbar could not be found. Is it correctly installed on your system?\n");
+ }
+
+ *((pid_t*)watcher->data) = -1;
+}
+
+/*
+ * Cleanup handler. Will be called when i3 exits. Kills i3-nagbar with signal
+ * SIGKILL (9) to make sure there are no left-over i3-nagbar processes.
+ *
+ */
+static void nagbar_cleanup(EV_P_ ev_cleanup *watcher, int revent) {
+ pid_t *nagbar_pid = (pid_t*)watcher->data;
+ if (*nagbar_pid != -1) {
+ LOG("Sending SIGKILL (%d) to i3-nagbar with PID %d\n", SIGKILL, *nagbar_pid);
+ kill(*nagbar_pid, SIGKILL);
+ }
+}
+
+/*
+ * Starts an i3-nagbar instance with the given parameters. Takes care of
+ * handling SIGCHLD and killing i3-nagbar when i3 exits.
+ *
+ * The resulting PID will be stored in *nagbar_pid and can be used with
+ * kill_nagbar() to kill the bar later on.
+ *
+ */
+void start_nagbar(pid_t *nagbar_pid, char *argv[]) {
+ if (*nagbar_pid != -1) {
+ DLOG("i3-nagbar already running (PID %d), not starting again.\n", *nagbar_pid);
+ return;
+ }
+
+ *nagbar_pid = fork();
+ if (*nagbar_pid == -1) {
+ warn("Could not fork()");
+ return;
+ }
+
+ /* child */
+ if (*nagbar_pid == 0)
+ exec_i3_utility("i3-nagbar", argv);
+
+ DLOG("Starting i3-nagbar with PID %d\n", *nagbar_pid);
+
+ /* parent */
+ /* install a child watcher */
+ ev_child *child = smalloc(sizeof(ev_child));
+ ev_child_init(child, &nagbar_exited, *nagbar_pid, 0);
+ child->data = nagbar_pid;
+ ev_child_start(main_loop, child);
+
+ /* install a cleanup watcher (will be called when i3 exits and i3-nagbar is
+ * still running) */
+ ev_cleanup *cleanup = smalloc(sizeof(ev_cleanup));
+ ev_cleanup_init(cleanup, nagbar_cleanup);
+ cleanup->data = nagbar_pid;
+ ev_cleanup_start(main_loop, cleanup);
+}
+
+/*
+ * Kills the i3-nagbar process, if *nagbar_pid != -1.
+ *
+ * If wait_for_it is set (restarting i3), this function will waitpid(),
+ * otherwise, ev is assumed to handle it (reloading).
+ *
+ */
+void kill_nagbar(pid_t *nagbar_pid, bool wait_for_it) {
+ if (*nagbar_pid == -1)
+ return;
+
+ if (kill(*nagbar_pid, SIGTERM) == -1)
+ warn("kill(configerror_nagbar) failed");
+
+ if (!wait_for_it)
+ return;
+
+ /* When restarting, we don’t enter the ev main loop anymore and after the
+ * exec(), our old pid is no longer watched. So, ev won’t handle SIGCHLD
+ * for us and we would end up with a <defunct> process. Therefore we
+ * waitpid() here. */
+ waitpid(*nagbar_pid, NULL, 0);
+}
projects / i3 / i3 / blobdiff