Revised error handling

- Functions warn() and die() replaced by GNU-like error(3) function
- Register cleanup() with atexit(3)
- Functions called by cleanup() are marked with CLEANUP and are not allowed to
  call exit(3)

commands.c

@@ -30,7 +30,6 @@
 #define _IMAGE_CONFIG
 #include "config.h"
 
-void cleanup(void);
 void remove_file(int, bool);
 void load_image(int);
 void open_info(void);
@@ -64,7 +63,6 @@ bool cg_quit(arg_t _)
 				printf("%s\n", files[i].name);
 		}
 	}
-	cleanup();
 	exit(EXIT_SUCCESS);
 }
 

image.c

@@ -16,6 +16,7 @@
  * along with sxiv.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <errno.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/types.h>
@@ -149,7 +150,7 @@ bool img_load_gif(img_t *img, const fileinfo_t *file)
 	gif = DGifOpenFileName(file->path);
 #endif
 	if (gif == NULL) {
-		warn("could not open gif file: %s", file->name);
+		error(0, 0, "%s: Error opening gif image", file->name);
 		return false;
 	}
 	bg = gif->SBackGroundColor;
@@ -274,7 +275,7 @@ bool img_load_gif(img_t *img, const fileinfo_t *file)
 #endif
 
 	if (err && (file->flags & FF_WARN))
-		warn("corrupted gif file: %s", file->name);
+		error(0, 0, "%s: Corrupted gif file", file->name);
 
 	if (img->multi.cnt > 1) {
 		imlib_context_set_image(img->im);
@@ -300,7 +301,7 @@ bool img_load(img_t *img, const fileinfo_t *file)
 	    (img->im = imlib_load_image(file->path)) == NULL)
 	{
 		if (file->flags & FF_WARN)
-			warn("could not open image: %s", file->name);
+			error(0, 0, "%s: Error opening image", file->name);
 		return false;
 	}
 
@@ -325,7 +326,7 @@ bool img_load(img_t *img, const fileinfo_t *file)
 	return true;
 }
 
-void img_close(img_t *img, bool decache)
+CLEANUP void img_close(img_t *img, bool decache)
 {
 	int i;
 
@@ -464,7 +465,7 @@ void img_render(img_t *img)
 
 	if (imlib_image_has_alpha()) {
 		if ((bg = imlib_create_image(dw, dh)) == NULL)
-			die("could not allocate memory");
+			error(EXIT_FAILURE, ENOMEM, NULL);
 		imlib_context_set_image(bg);
 		imlib_image_set_has_alpha(0);
 

image.h

@@ -69,7 +69,7 @@ typedef struct {
 void img_init(img_t*, win_t*);
 
 bool img_load(img_t*, const fileinfo_t*);
-void img_close(img_t*, bool);
+CLEANUP void img_close(img_t*, bool);
 
 void img_render(img_t*);
 

main.c

@@ -42,11 +42,6 @@
 #define _MAPPINGS_CONFIG
 #include "config.h"
 
-typedef struct {
-	const char *name;
-	char *cmd;
-} exec_t;
-
 typedef struct {
 	struct timeval when;
 	bool active;
@@ -75,15 +70,20 @@ bool extprefix;
 
 bool resized = false;
 
-struct {
+typedef struct {
+	int err;
 	char *cmd;
+} extcmd_t;
+
+struct {
+  extcmd_t f;
   int fd;
   unsigned int i, lastsep;
   bool open;
 } info;
 
 struct {
-	char *cmd;
+	extcmd_t f;
 	bool warned;
 } keyhandler;
 
@@ -97,26 +97,24 @@ timeout_t timeouts[] = {
 
 void cleanup(void)
 {
-	static bool in = false;
-
-	if (!in) {
-		in = true;
 	img_close(&img, false);
 	tns_free(&tns);
 	win_close(&win);
-	}
 }
 
 void check_add_file(char *filename, bool given)
 {
+	char *path;
 	const char *bn;
 
 	if (*filename == '\0')
 		return;
 
-	if (access(filename, R_OK) < 0) {
+	if (access(filename, R_OK) < 0 ||
+	    (path = realpath(filename, NULL)) == NULL)
+	{
 		if (given)
-			warn("could not open file: %s", filename);
+			error(0, errno, "%s", filename);
 		return;
 	}
 
@@ -126,12 +124,8 @@ void check_add_file(char *filename, bool given)
 		memset(&files[filecnt/2], 0, filecnt/2 * sizeof(*files));
 	}
 
-	if ((files[fileidx].path = realpath(filename, NULL)) == NULL) {
-		warn("could not get real path of file: %s\n", filename);
-		return;
-	}
-
 	files[fileidx].name = estrdup(filename);
+	files[fileidx].path = path;
 	if ((bn = strrchr(files[fileidx].name , '/')) != NULL && bn[1] != '\0')
 		files[fileidx].base = ++bn;
 	else
@@ -149,7 +143,6 @@ void remove_file(int n, bool manual)
 	if (filecnt == 1) {
 		if (!manual)
 			fprintf(stderr, "sxiv: no more files to display, aborting\n");
-		cleanup();
 		exit(manual ? EXIT_SUCCESS : EXIT_FAILURE);
 	}
 	if (files[n].flags & FF_MARK)
@@ -232,7 +225,7 @@ void open_info(void)
 	static pid_t pid;
 	int pfd[2];
 
-	if (info.cmd == NULL || info.open || win.bar.h == 0)
+	if (info.f.err != 0 || info.open || win.bar.h == 0)
 		return;
 	if (info.fd != -1) {
 		close(info.fd);
@@ -246,9 +239,8 @@ void open_info(void)
 	if ((pid = fork()) == 0) {
 		close(pfd[0]);
 		dup2(pfd[1], 1);
-		execl(info.cmd, info.cmd, files[fileidx].name, NULL);
+		execl(info.f.cmd, info.f.cmd, files[fileidx].name, NULL);
-		warn("could not exec: %s", info.cmd);
+		error(EXIT_FAILURE, errno, "exec: %s", info.f.cmd);
-		exit(EXIT_FAILURE);
 	}
 	close(pfd[1]);
 	if (pid < 0) {
@@ -386,7 +378,7 @@ void update_info(void)
 			bar_put(r, "%0*d/%d | ", fn, img.multi.sel + 1, img.multi.cnt);
 		}
 		bar_put(r, "%0*d/%d", fw, fileidx + 1, filecnt);
-		ow_info = info.cmd == NULL;
+		ow_info = info.f.err != 0;
 	}
 	if (ow_info) {
 		fn = strlen(files[fileidx].name);
@@ -469,14 +461,14 @@ void run_key_handler(const char *key, unsigned int mask)
 	FILE *pfs;
 	bool marked = mode == MODE_THUMB && markcnt > 0;
 	bool changed = false;
-	int f, i, pfd[2], retval, status;
+	int f, i, pfd[2], status;
 	int fcnt = marked ? markcnt : 1;
 	char kstr[32];
 	struct stat *oldst, st;
 
-	if (keyhandler.cmd == NULL) {
+	if (keyhandler.f.err != 0) {
 		if (!keyhandler.warned) {
-			warn("key handler not installed");
+			error(0, keyhandler.f.err, "%s", keyhandler.f.cmd);
 			keyhandler.warned = true;
 		}
 		return;
@@ -485,12 +477,12 @@ void run_key_handler(const char *key, unsigned int mask)
 		return;
 
 	if (pipe(pfd) < 0) {
-		warn("could not create pipe for key handler");
+		error(0, errno, "pipe");
 		return;
 	}
 	if ((pfs = fdopen(pfd[1], "w")) == NULL) {
+		error(0, errno, "open pipe");
 		close(pfd[0]), close(pfd[1]);
-		warn("could not open pipe for key handler");
 		return;
 	}
 	oldst = emalloc(fcnt * sizeof(*oldst));
@@ -507,14 +499,13 @@ void run_key_handler(const char *key, unsigned int mask)
 	if ((pid = fork()) == 0) {
 		close(pfd[1]);
 		dup2(pfd[0], 0);
-		execl(keyhandler.cmd, keyhandler.cmd, kstr, NULL);
+		execl(keyhandler.f.cmd, keyhandler.f.cmd, kstr, NULL);
-		warn("could not exec key handler");
+		error(EXIT_FAILURE, errno, "exec: %s", keyhandler.f.cmd);
-		exit(EXIT_FAILURE);
 	}
 	close(pfd[0]);
 	if (pid < 0) {
+		error(0, errno, "fork");
 		fclose(pfs);
-		warn("could not fork key handler");
 		goto end;
 	}
 
@@ -527,9 +518,8 @@ void run_key_handler(const char *key, unsigned int mask)
 	}
 	fclose(pfs);
 	waitpid(pid, &status, 0);
-	retval = WEXITSTATUS(status);
+	if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
-	if (WIFEXITED(status) == 0 || retval != 0)
+		error(0, 0, "%s: Exited abnormally", keyhandler.f.cmd);
-		warn("key handler exited with non-zero return value: %d", retval);
 
 	for (f = i = 0; f < fcnt; i++) {
 		if ((marked && (files[i].flags & FF_MARK)) || (!marked && i == fileidx)) {
@@ -550,7 +540,7 @@ end:
 		if (changed) {
 			img_close(&img, true);
 			load_image(fileidx);
-		} else if (info.cmd != NULL) {
+		} else if (info.f.err == 0) {
 			info.open = false;
 			open_info();
 		}
@@ -819,18 +809,18 @@ int main(int argc, char **argv)
 		filename = options->filenames[i];
 
 		if (stat(filename, &fstats) < 0) {
-			warn("could not stat file: %s", filename);
+			error(0, errno, "%s", filename);
 			continue;
 		}
 		if (!S_ISDIR(fstats.st_mode)) {
 			check_add_file(filename, true);
 		} else {
 			if (!options->recursive) {
-				warn("ignoring directory: %s", filename);
+				error(0, 0, "%s: Is a directory", filename);
 				continue;
 			}
 			if (r_opendir(&dir, filename) < 0) {
-				warn("could not open directory: %s", filename);
+				error(0, errno, "%s", filename);
 				continue;
 			}
 			start = fileidx;
@@ -844,10 +834,8 @@ int main(int argc, char **argv)
 		}
 	}
 
-	if (fileidx == 0) {
+	if (fileidx == 0)
-		fprintf(stderr, "sxiv: no valid image file given, aborting\n");
+		error(EXIT_FAILURE, 0, "No valid image file given, aborting");
-		exit(EXIT_FAILURE);
-	}
 
 	filecnt = fileidx;
 	fileidx = options->startnum < filecnt ? options->startnum : 0;
@@ -860,20 +848,18 @@ int main(int argc, char **argv)
 		dsuffix = "/.config";
 	}
 	if (homedir != NULL) {
-		char **cmd[] = { &info.cmd, &keyhandler.cmd };
+		extcmd_t *cmd[] = { &info.f, &keyhandler.f };
 		const char *name[] = { "image-info", "key-handler" };
 
 		for (i = 0; i < ARRLEN(cmd); i++) {
 			n = strlen(homedir) + strlen(dsuffix) + strlen(name[i]) + 12;
-			*cmd[i] = (char*) emalloc(n);
+			cmd[i]->cmd = (char*) emalloc(n);
-			snprintf(*cmd[i], n, "%s%s/sxiv/exec/%s", homedir, dsuffix, name[i]);
+			snprintf(cmd[i]->cmd, n, "%s%s/sxiv/exec/%s", homedir, dsuffix, name[i]);
-			if (access(*cmd[i], X_OK) != 0) {
+			if (access(cmd[i]->cmd, X_OK) != 0)
-				free(*cmd[i]);
+				cmd[i]->err = errno;
-				*cmd[i] = NULL;
-			}
 		}
 	} else {
-		warn("could not locate exec directory");
+		error(0, 0, "Exec directory not found");
 	}
 	info.fd = -1;
 
@@ -890,10 +876,11 @@ int main(int argc, char **argv)
 	win_open(&win);
 	win_set_cursor(&win, CURSOR_WATCH);
 
+	atexit(cleanup);
+
 	set_timeout(redraw, 25, false);
 
 	run();
-	cleanup();
 
 	return 0;
 }

options.c

@@ -47,6 +47,9 @@ void parse_options(int argc, char **argv)
 	char *end, *s;
 	const char *scalemodes = "dfwh";
 
+	progname = strrchr(argv[0], '/');
+	progname = progname ? progname + 1 : argv[0];
+
 	_options.from_stdin = false;
 	_options.to_stdout = false;
 	_options.recursive = false;
@@ -86,10 +89,8 @@ void parse_options(int argc, char **argv)
 				break;
 			case 'G':
 				n = strtol(optarg, &end, 0);
-				if (*end != '\0') {
+				if (*end != '\0')
-					fprintf(stderr, "sxiv: invalid argument for option -G: %s\n", optarg);
+					error(EXIT_FAILURE, 0, "Invalid argument for option -G: %s", optarg);
-					exit(EXIT_FAILURE);
-				}
 				_options.gamma = n;
 				break;
 			case 'g':
@@ -103,10 +104,8 @@ void parse_options(int argc, char **argv)
 				break;
 			case 'n':
 				n = strtol(optarg, &end, 0);
-				if (*end != '\0' || n <= 0) {
+				if (*end != '\0' || n <= 0)
-					fprintf(stderr, "sxiv: invalid argument for option -n: %s\n", optarg);
+					error(EXIT_FAILURE, 0, "Invalid argument for option -n: %s", optarg);
-					exit(EXIT_FAILURE);
-				}
 				_options.startnum = n - 1;
 				break;
 			case 'N':
@@ -123,18 +122,14 @@ void parse_options(int argc, char **argv)
 				break;
 			case 'S':
 				n = strtol(optarg, &end, 0);
-				if (*end != '\0' || n <= 0) {
+				if (*end != '\0' || n <= 0)
-					fprintf(stderr, "sxiv: invalid argument for option -S: %s\n", optarg);
+					error(EXIT_FAILURE, 0, "Invalid argument for option -S: %s", optarg);
-					exit(EXIT_FAILURE);
-				}
 				_options.slideshow = n;
 				break;
 			case 's':
 				s = strchr(scalemodes, optarg[0]);
-				if (s == NULL || *s == '\0' || strlen(optarg) != 1) {
+				if (s == NULL || *s == '\0' || strlen(optarg) != 1)
-					fprintf(stderr, "sxiv: invalid argument for option -s: %s\n", optarg);
+					error(EXIT_FAILURE, 0, "Invalid argument for option -s: %s", optarg);
-					exit(EXIT_FAILURE);
-				}
 				_options.scalemode = s - scalemodes;
 				break;
 			case 't':
@@ -149,10 +144,8 @@ void parse_options(int argc, char **argv)
 				break;
 			case 'z':
 				n = strtol(optarg, &end, 0);
-				if (*end != '\0' || n <= 0) {
+				if (*end != '\0' || n <= 0)
-					fprintf(stderr, "sxiv: invalid argument for option -z: %s\n", optarg);
+					error(EXIT_FAILURE, 0, "Invalid argument for option -z: %s", optarg);
-					exit(EXIT_FAILURE);
-				}
 				_options.scalemode = SCALE_ZOOM;
 				_options.zoom = (float) n / 100.0;
 				break;

thumbs.c

@@ -16,6 +16,7 @@
  * along with sxiv.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -122,7 +123,7 @@ void tns_clean_cache(tns_t *tns)
 	r_dir_t dir;
 
 	if (r_opendir(&dir, cache_dir) < 0) {
-		warn("could not open thumbnail cache directory: %s", cache_dir);
+		error(0, errno, "%s", cache_dir);
 		return;
 	}
 
@@ -140,7 +141,7 @@ void tns_clean_cache(tns_t *tns)
 		}
 		if (delete) {
 			if (unlink(cfile) < 0)
-				warn("could not delete cache file: %s", cfile);
+				error(0, errno, "%s", cfile);
 		}
 		free(cfile);
 	}
@@ -181,11 +182,11 @@ void tns_init(tns_t *tns, fileinfo_t *files, const int *cnt, int *sel,
 		cache_dir = (char*) emalloc(len);
 		snprintf(cache_dir, len, "%s%s/sxiv", homedir, dsuffix);
 	} else {
-		warn("could not locate thumbnail cache directory");
+		error(0, 0, "Cache directory not found");
 	}
 }
 
-void tns_free(tns_t *tns)
+CLEANUP void tns_free(tns_t *tns)
 {
 	int i;
 
@@ -222,7 +223,7 @@ Imlib_Image tns_scale_down(Imlib_Image im, int dim)
 		im = imlib_create_cropped_scaled_image(0, 0, w, h,
 		                                       MAX(z * w, 1), MAX(z * h, 1));
 		if (im == NULL)
-			die("could not allocate memory");
+			error(EXIT_FAILURE, ENOMEM, NULL);
 		imlib_free_image_and_decache();
 	}
 	return im;
@@ -316,7 +317,7 @@ bool tns_load(tns_t *tns, int n, bool force, bool cache_only)
 						}
 						if (w >= maxwh || h >= maxwh) {
 							if ((im = imlib_create_cropped_image(x, y, w, h)) == NULL)
-								die("could not allocate memory");
+								error(EXIT_FAILURE, ENOMEM, NULL);
 						}
 						imlib_free_image_and_decache();
 					}
@@ -332,7 +333,7 @@ bool tns_load(tns_t *tns, int n, bool force, bool cache_only)
 	    (im = imlib_load_image(file->path)) == NULL))
 	{
 		if (file->flags & FF_WARN)
-			warn("could not open image: %s", file->name);
+			error(0, 0, "%s: Error opening image", file->name);
 		return false;
 	}
 	imlib_context_set_image(im);

thumbs.h

@@ -58,7 +58,7 @@ typedef struct {
 void tns_clean_cache(tns_t*);
 
 void tns_init(tns_t*, fileinfo_t*, const int*, int*, win_t*);
-void tns_free(tns_t*);
+CLEANUP void tns_free(tns_t*);
 
 bool tns_load(tns_t*, int, bool, bool);
 void tns_unload(tns_t*, int);

types.h

@@ -21,6 +21,8 @@
 
 #include <stdbool.h>
 
+#define CLEANUP
+
 typedef enum {
 	BO_BIG_ENDIAN,
 	BO_LITTLE_ENDIAN

util.c

@@ -26,7 +26,7 @@
 #include "options.h"
 #include "util.h"
 
-void cleanup(void);
+const char *progname;
 
 void* emalloc(size_t size)
 {
@@ -34,7 +34,7 @@ void* emalloc(size_t size)
 	
 	ptr = malloc(size);
 	if (ptr == NULL)
-		die("could not allocate memory");
+		error(EXIT_FAILURE, errno, NULL);
 	return ptr;
 }
 
@@ -42,7 +42,7 @@ void* erealloc(void *ptr, size_t size)
 {
 	ptr = realloc(ptr, size);
 	if (ptr == NULL)
-		die("could not allocate memory");
+		error(EXIT_FAILURE, errno, NULL);
 	return ptr;
 }
 
@@ -53,40 +53,27 @@ char* estrdup(const char *s)
 
 	d = malloc(n);
 	if (d == NULL)
-		die("could not allocate memory");
+		error(EXIT_FAILURE, errno, NULL);
 	memcpy(d, s, n);
 	return d;
 }
 
-void warn(const char* fmt, ...)
+void error(int eval, int err, const char* fmt, ...)
 {
-	va_list args;
+	va_list ap;
 
-	if (fmt == NULL || options->quiet)
+	fflush(stdout);
-		return;
+	fprintf(stderr, "%s: ", progname);
+	va_start(ap, fmt);
+	if (fmt != NULL)
+		vfprintf(stderr, fmt, ap);
+	va_end(ap);
+	if (err != 0)
+		fprintf(stderr, "%s%s", fmt != NULL ? ": " : "", strerror(err));
+	fputc('\n', stderr);
 
-	va_start(args, fmt);
+	if (eval != 0)
-	fprintf(stderr, "sxiv: warning: ");
+		exit(eval);
-	vfprintf(stderr, fmt, args);
-	fprintf(stderr, "\n");
-	va_end(args);
-}
-
-void die(const char* fmt, ...)
-{
-	va_list args;
-
-	if (fmt == NULL)
-		return;
-
-	va_start(args, fmt);
-	fprintf(stderr, "sxiv: error: ");
-	vfprintf(stderr, fmt, args);
-	fprintf(stderr, "\n");
-	va_end(args);
-
-	cleanup();
-	exit(EXIT_FAILURE);
 }
 
 void size_readable(float *size, const char **unit)
@@ -185,7 +172,7 @@ char* r_readdir(r_dir_t *rdir)
 			rdir->name = rdir->stack[--rdir->stlen];
 			rdir->d = 1;
 			if ((rdir->dir = opendir(rdir->name)) == NULL)
-				warn("could not open directory: %s", rdir->name);
+				error(0, errno, "%s", rdir->name);
 			continue;
 		}
 		/* no more entries */
@@ -215,7 +202,7 @@ int r_mkdir(const char *path)
 			*d = '\0';
 		if (access(dir, F_OK) < 0 && errno == ENOENT) {
 			if (mkdir(dir, 0755) < 0) {
-				warn("could not create directory: %s", dir);
+				error(0, errno, "%s", dir);
 				err = -1;
 			}
 		} else if (stat(dir, &stats) < 0 || !S_ISDIR(stats.st_mode)) {

util.h

@@ -61,12 +61,13 @@ typedef struct {
 	int stlen;
 } r_dir_t;
 
+extern const char *progname;
+
 void* emalloc(size_t);
 void* erealloc(void*, size_t);
 char* estrdup(const char*);
 
-void warn(const char*, ...);
+void error(int, int, const char*, ...);
-void die(const char*, ...);
 
 void size_readable(float*, const char**);
 

window.c

@@ -80,7 +80,7 @@ void win_init_font(Display *dpy, const char *fontstr)
 		if ((font.xfont = XLoadQueryFont(dpy, fontstr)) == NULL &&
 		    (font.xfont = XLoadQueryFont(dpy, "fixed")) == NULL)
 		{
-			die("could not load font: %s", fontstr);
+			error(EXIT_FAILURE, 0, "Error loading font '%s'", fontstr);
 		}
 		font.ascent  = font.xfont->ascent;
 		font.descent = font.xfont->descent;
@@ -97,7 +97,7 @@ unsigned long win_alloc_color(win_t *win, const char *name)
 	                     DefaultColormap(win->env.dpy, win->env.scr),
 	                     name, &col, &col) == 0)
 	{
-		die("could not allocate color: %s", name);
+		error(EXIT_FAILURE, 0, "Error allocating color '%s'", name);
 	}
 	return col.pixel;
 }
@@ -143,7 +143,7 @@ void win_init(win_t *win)
 
 	e = &win->env;
 	if ((e->dpy = XOpenDisplay(NULL)) == NULL)
-		die("could not open display");
+		error(EXIT_FAILURE, 0, "Error opening X display");
 
 	e->scr = DefaultScreen(e->dpy);
 	e->scrw = DisplayWidth(e->dpy, e->scr);
@@ -153,7 +153,7 @@ void win_init(win_t *win)
 	e->depth = DefaultDepth(e->dpy, e->scr);
 
 	if (setlocale(LC_CTYPE, "") == NULL || XSupportsLocale() == 0)
-		warn("no locale support");
+		error(0, 0, "No locale support");
 
 	win_init_font(e->dpy, BAR_FONT);
 
@@ -236,7 +236,7 @@ void win_open(win_t *win)
 	                          win->x, win->y, win->w, win->h, 0,
 	                          e->depth, InputOutput, e->vis, 0, NULL);
 	if (win->xwin == None)
-		die("could not create window");
+		error(EXIT_FAILURE, 0, "Error creating X window");
 	
 	XSelectInput(e->dpy, win->xwin,
 	             ButtonReleaseMask | ButtonPressMask | KeyPressMask |
@@ -249,7 +249,7 @@ void win_open(win_t *win)
 	if (XAllocNamedColor(e->dpy, DefaultColormap(e->dpy, e->scr), "black",
 	                     &col, &col) == 0)
 	{
-		die("could not allocate color: black");
+		error(EXIT_FAILURE, 0, "Error allocating color 'black'");
 	}
 	none = XCreateBitmapFromData(e->dpy, win->xwin, none_data, 8, 8);
 	cnone = XCreatePixmapCursor(e->dpy, none, none, &col, &col, 0, 0);
@@ -306,7 +306,7 @@ void win_open(win_t *win)
 		win_toggle_fullscreen(win);
 }
 
-void win_close(win_t *win)
+CLEANUP void win_close(win_t *win)
 {
 	XFreeCursor(win->env.dpy, carrow);
 	XFreeCursor(win->env.dpy, cnone);
@@ -341,7 +341,7 @@ void win_toggle_fullscreen(win_t *win)
 
 	if (!fs_support) {
 		if (!fs_warned) {
-			warn("window manager does not support fullscreen");
+			error(0, 0, "No fullscreen support");
 			fs_warned = True;
 		}
 		return;

window.h

@@ -90,7 +90,7 @@ extern Atom atoms[ATOM_COUNT];
 
 void win_init(win_t*);
 void win_open(win_t*);
-void win_close(win_t*);
+CLEANUP void win_close(win_t*);
 
 bool win_configure(win_t*, XConfigureEvent*);