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Spawn and read from info script without blocking

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commit f3298400e6704844aeb1d3e0951e84b4236d2302 1 parent 9ee3447
@muennich authored
Showing with 131 additions and 84 deletions.
  1. +92 −52 main.c
  2. +30 −29 window.c
  3. +9 −3 window.h
View
144 main.c
@@ -22,10 +22,14 @@
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
+#include <fcntl.h>
#include <unistd.h>
+#include <errno.h>
+#include <signal.h>
#include <sys/select.h>
#include <sys/stat.h>
#include <sys/time.h>
+#include <sys/wait.h>
#include <X11/keysym.h>
#include "types.h"
@@ -38,8 +42,6 @@
#include "config.h"
enum {
- BAR_L_LEN = 512,
- BAR_R_LEN = 64,
FILENAME_CNT = 1024,
TITLE_LEN = 256
};
@@ -70,12 +72,11 @@ int prefix;
bool resized = false;
const char * const INFO_SCRIPT = ".sxiv/exec/image-info";
-char *info_script;
-
struct {
- char l[BAR_L_LEN];
- char r[BAR_R_LEN];
-} bar;
+ char *script;
+ int fd;
+ unsigned int i, lastsep;
+} info;
timeout_t timeouts[] = {
{ { 0, 0 }, false, redraw },
@@ -212,35 +213,66 @@ bool check_timeouts(struct timeval *t)
return tmin > 0;
}
+void open_info(void)
+{
+ static pid_t pid;
+ int pfd[2];
+
+ win.bar.l[0] = '\0';
+
+ if (info.fd != -1) {
+ close(info.fd);
+ kill(pid, SIGTERM);
+ while (waitpid(-1, NULL, WNOHANG) > 0);
+ info.fd = -1;
+ }
+ if (info.script == NULL || pipe(pfd) < 0)
+ return;
+
+ pid = fork();
+ if (pid > 0) {
+ close(pfd[1]);
+ fcntl(pfd[0], F_SETFL, O_NONBLOCK);
+ info.fd = pfd[0];
+ info.i = info.lastsep = 0;
+ } else if (pid == 0) {
+ close(pfd[0]);
+ dup2(pfd[1], 1);
+ execl(info.script, info.script, files[fileidx].name, NULL);
+ }
+}
+
void read_info(void)
{
- char cmd[4096];
- FILE *outp;
- int c, i = 0, n = sizeof(bar.l) - 1;
- bool lastsep = false;
-
- if (info_script != NULL) {
- snprintf(cmd, sizeof(cmd), "%s \"%s\"", info_script, files[fileidx].name);
- outp = popen(cmd, "r");
- if (outp == NULL)
+ ssize_t i, n;
+ char buf[BAR_L_LEN];
+
+ while (true) {
+ n = read(info.fd, buf, sizeof(buf));
+ if (n < 0 && errno == EAGAIN)
+ return;
+ else if (n == 0)
goto end;
- while (i < n && (c = fgetc(outp)) != EOF) {
- if (c == '\n') {
- if (!lastsep) {
- bar.l[i++] = ' ';
- lastsep = true;
+ for (i = 0; i < n; i++) {
+ if (buf[i] == '\n') {
+ if (info.lastsep == 0) {
+ win.bar.l[info.i++] = ' ';
+ info.lastsep = 1;
}
} else {
- bar.l[i++] = c;
- lastsep = false;
+ win.bar.l[info.i++] = buf[i];
+ info.lastsep = 0;
}
+ if (info.i + 1 == sizeof(win.bar.l))
+ goto end;
}
- pclose(outp);
}
end:
- if (lastsep)
- i--;
- bar.l[i] = '\0';
+ info.i -= info.lastsep;
+ win.bar.l[info.i] = '\0';
+ win_update_bar(&win);
+ info.fd = -1;
+ while (waitpid(-1, NULL, WNOHANG) > 0);
}
void load_image(int new)
@@ -261,7 +293,7 @@ void load_image(int new)
alternate = fileidx;
fileidx = new;
- read_info();
+ open_info();
if (img.multi.cnt > 0 && img.multi.animate)
set_timeout(animate, img.multi.frames[img.multi.sel].delay, true);
@@ -271,9 +303,10 @@ void load_image(int new)
void update_info(void)
{
- unsigned int i, fn, fw, n, len = sizeof(bar.r);
int sel;
- char *t = bar.r, title[TITLE_LEN];
+ unsigned int i, fn, fw, n;
+ unsigned int llen = sizeof(win.bar.l), rlen = sizeof(win.bar.r);
+ char *lt = win.bar.l, *rt = win.bar.r, title[TITLE_LEN];
bool ow_info;
for (fw = 0, i = filecnt; i > 0; fw++, i /= 10);
@@ -283,39 +316,37 @@ void update_info(void)
win_set_title(&win, "sxiv");
if (tns.cnt == filecnt) {
- n = snprintf(t, len, "%0*d/%d", fw, sel + 1, filecnt);
+ n = snprintf(rt, rlen, "%0*d/%d", fw, sel + 1, filecnt);
ow_info = true;
} else {
- snprintf(bar.l, sizeof(bar.l), "Loading... %0*d/%d",
- fw, tns.cnt, filecnt);
- bar.r[0] = '\0';
+ snprintf(lt, llen, "Loading... %0*d/%d", fw, tns.cnt, filecnt);
+ rt[0] = '\0';
ow_info = false;
}
} else {
snprintf(title, sizeof(title), "sxiv - %s", files[sel].name);
win_set_title(&win, title);
- n = snprintf(t, len, "%3d%% ", (int) (img.zoom * 100.0));
+ n = snprintf(rt, rlen, "%3d%% ", (int) (img.zoom * 100.0));
if (img.multi.cnt > 0) {
for (fn = 0, i = img.multi.cnt; i > 0; fn++, i /= 10);
- n += snprintf(t + n, len - n, "(%0*d/%d) ",
+ n += snprintf(rt + n, rlen - n, "(%0*d/%d) ",
fn, img.multi.sel + 1, img.multi.cnt);
}
- n += snprintf(t + n, len - n, "%0*d/%d", fw, sel + 1, filecnt);
- ow_info = bar.l[0] == '\0';
+ n += snprintf(rt + n, rlen - n, "%0*d/%d", fw, sel + 1, filecnt);
+ ow_info = info.script == NULL;
}
if (ow_info) {
fn = strlen(files[sel].name);
- if (fn < sizeof(bar.l) &&
+ if (fn < llen &&
win_textwidth(files[sel].name, fn, true) +
- win_textwidth(bar.r, n, true) < win.w)
+ win_textwidth(rt, n, true) < win.w)
{
- strncpy(bar.l, files[sel].name, sizeof(bar.l));
+ strncpy(lt, files[sel].name, llen);
} else {
- strncpy(bar.l, files[sel].base, sizeof(bar.l));
+ strncpy(lt, files[sel].base, llen);
}
}
- win_set_bar_info(&win, bar.l, bar.r);
}
void redraw(void)
@@ -458,8 +489,8 @@ void run(void)
int xfd;
fd_set fds;
struct timeval timeout;
+ bool discard, to_set;
XEvent ev, nextev;
- bool discard;
redraw();
@@ -482,12 +513,20 @@ void run(void)
check_timeouts(NULL);
}
- while (XPending(win.env.dpy) == 0 && check_timeouts(&timeout)) {
- /* wait for timeouts */
+ while (XPending(win.env.dpy) == 0
+ && ((to_set = check_timeouts(&timeout)) || info.fd != -1))
+ {
+ /* check for timeouts & input */
xfd = ConnectionNumber(win.env.dpy);
FD_ZERO(&fds);
FD_SET(xfd, &fds);
- select(xfd + 1, &fds, 0, 0, &timeout);
+ if (info.fd != -1) {
+ FD_SET(info.fd, &fds);
+ xfd = MAX(xfd, info.fd);
+ }
+ select(xfd + 1, &fds, 0, 0, to_set ? &timeout : NULL);
+ if (FD_ISSET(info.fd, &fds))
+ read_info();
}
do {
@@ -641,13 +680,14 @@ int main(int argc, char **argv)
warn("could not locate home directory");
} else {
len = strlen(homedir) + strlen(INFO_SCRIPT) + 2;
- info_script = (char*) s_malloc(len);
- snprintf(info_script, len, "%s/%s", homedir, INFO_SCRIPT);
- if (access(info_script, X_OK) != 0) {
- free(info_script);
- info_script = NULL;
+ info.script = (char*) s_malloc(len);
+ snprintf(info.script, len, "%s/%s", homedir, INFO_SCRIPT);
+ if (access(info.script, X_OK) != 0) {
+ free(info.script);
+ info.script = NULL;
}
}
+ info.fd = -1;
if (options->thumb_mode) {
mode = MODE_THUMB;
View
59 window.c
@@ -414,31 +414,28 @@ void win_draw_bar(win_t *win)
XSetForeground(e->dpy, gc, win->bar.fgcol);
XSetBackground(e->dpy, gc, win->bar.bgcol);
- if (win->bar.r != NULL) {
- len = strlen(win->bar.r);
- if (len > 0) {
- if ((tw = win_textwidth(win->bar.r, len, true)) > w)
- return;
- x = win->w - tw + H_TEXT_PAD;
- w -= tw;
- if (font.set)
- XmbDrawString(e->dpy, win->pm, font.set, gc, x, y, win->bar.r, len);
- else
- XDrawString(e->dpy, win->pm, gc, x, y, win->bar.r, len);
- }
+ if ((len = strlen(win->bar.r)) > 0) {
+ if ((tw = win_textwidth(win->bar.r, len, true)) > w)
+ return;
+ x = win->w - tw + H_TEXT_PAD;
+ w -= tw;
+ if (font.set)
+ XmbDrawString(e->dpy, win->pm, font.set, gc, x, y, win->bar.r, len);
+ else
+ XDrawString(e->dpy, win->pm, gc, x, y, win->bar.r, len);
}
- if (win->bar.l != NULL) {
- olen = len = strlen(win->bar.l);
+ if ((len = strlen(win->bar.l)) > 0) {
+ olen = len;
while (len > 0 && (tw = win_textwidth(win->bar.l, len, true)) > w)
len--;
if (len > 0) {
- if (len != olen) {
- w = strlen(dots);
- if (len <= w)
- return;
- memcpy(rest, win->bar.l + len - w, w);
- memcpy(win->bar.l + len - w, dots, w);
- }
+ if (len != olen) {
+ w = strlen(dots);
+ if (len <= w)
+ return;
+ memcpy(rest, win->bar.l + len - w, w);
+ memcpy(win->bar.l + len - w, dots, w);
+ }
x = H_TEXT_PAD;
if (font.set)
XmbDrawString(e->dpy, win->pm, font.set, gc, x, y, win->bar.l, len);
@@ -480,6 +477,18 @@ void win_draw_rect(win_t *win, Pixmap pm, int x, int y, int w, int h,
XDrawRectangle(win->env.dpy, pm, gc, x, y, w, h);
}
+void win_update_bar(win_t *win)
+{
+ if (win == NULL || win->xwin == None || win->pm == None)
+ return;
+
+ if (win->bar.h > 0) {
+ win_draw_bar(win);
+ XCopyArea(win->env.dpy, win->pm, win->xwin, gc,
+ 0, win->h, win->w, win->bar.h, 0, win->h);
+ }
+}
+
int win_textwidth(const char *text, unsigned int len, bool with_padding)
{
XRectangle r;
@@ -514,14 +523,6 @@ void win_set_title(win_t *win, const char *title)
PropModeReplace, (unsigned char *) title, strlen(title));
}
-void win_set_bar_info(win_t *win, char *linfo, char *rinfo)
-{
- if (win != NULL) {
- win->bar.l = linfo;
- win->bar.r = rinfo;
- }
-}
-
void win_set_cursor(win_t *win, cursor_t cursor)
{
if (win == NULL || win->xwin == None)
View
12 window.h
@@ -24,6 +24,11 @@
#include "types.h"
+enum {
+ BAR_L_LEN = 512,
+ BAR_R_LEN = 64
+};
+
typedef struct {
Display *dpy;
int scr;
@@ -55,8 +60,8 @@ typedef struct {
struct {
unsigned int h;
- char *l;
- char *r;
+ char l[BAR_L_LEN];
+ char r[BAR_R_LEN];
unsigned long bgcol;
unsigned long fgcol;
} bar;
@@ -80,10 +85,11 @@ void win_draw(win_t*);
void win_draw_rect(win_t*, Pixmap, int, int, int, int, bool, int,
unsigned long);
+void win_update_bar(win_t*);
+
int win_textwidth(const char*, unsigned int, bool);
void win_set_title(win_t*, const char*);
-void win_set_bar_info(win_t*, char*, char*);
void win_set_cursor(win_t*, cursor_t);
#endif /* WINDOW_H */
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