| 1 | /* evilwm - Minimalist Window Manager for X |
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| 2 | * Copyright (C) 1999-2006 Ciaran Anscomb <evilwm@6809.org.uk> |
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| 3 | * see README for license and other details. */ |
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| 4 | |
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| 5 | #include <X11/Xproto.h> |
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| 6 | #include <stdlib.h> |
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| 7 | #include <stdarg.h> |
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| 8 | #include <signal.h> |
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| 9 | #include <sys/wait.h> |
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| 10 | #include <unistd.h> |
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| 11 | #include "evilwm.h" |
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| 12 | #include "log.h" |
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| 13 | |
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| 14 | int need_client_tidy = 0; |
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| 15 | int ignore_xerror = 0; |
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| 16 | |
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| 17 | /* Now do this by fork()ing twice so we don't have to worry about SIGCHLDs */ |
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| 18 | void spawn(const char *const cmd[]) { |
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| 19 | ScreenInfo *current_screen = find_current_screen(); |
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| 20 | pid_t pid; |
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| 21 | |
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| 22 | if (current_screen && current_screen->display) |
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| 23 | putenv(current_screen->display); |
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| 24 | if (!(pid = fork())) { |
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| 25 | setsid(); |
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| 26 | switch (fork()) { |
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| 27 | /* Expect compiler warnings because of half-broken SUS |
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| 28 | * execvp prototype: "char *const argv[]" should have |
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| 29 | * been "const char *const argv[]", but the committee |
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| 30 | * favored legacy code over modern code, and modern |
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| 31 | * compilers bark at our extra const. (LD) */ |
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| 32 | case 0: execvp(cmd[0], cmd+1); |
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| 33 | default: _exit(0); |
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| 34 | } |
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| 35 | } |
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| 36 | if (pid > 0) |
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| 37 | wait(NULL); |
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| 38 | } |
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| 39 | |
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| 40 | void handle_signal(int signo) { |
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| 41 | int i; |
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| 42 | (void)signo; /* unused */ |
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| 43 | /* SIGCHLD check no longer necessary */ |
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| 44 | /* Quit Nicely */ |
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| 45 | while(head_client) remove_client(head_client); |
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| 46 | XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime); |
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| 47 | if (font) XFreeFont(dpy, font); |
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| 48 | for (i = 0; i < num_screens; i++) { |
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| 49 | XFreeGC(dpy, screens[i].invert_gc); |
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| 50 | XInstallColormap(dpy, DefaultColormap(dpy, i)); |
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| 51 | } |
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| 52 | free(screens); |
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| 53 | XCloseDisplay(dpy); |
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| 54 | exit(0); |
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| 55 | } |
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| 56 | |
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| 57 | int handle_xerror(Display *dsply, XErrorEvent *e) { |
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| 58 | Client *c; |
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| 59 | (void)dsply; /* unused */ |
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| 60 | |
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| 61 | if (ignore_xerror) { |
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| 62 | LOG_DEBUG("handle_xerror() ignored an XErrorEvent: %d\n", e->error_code); |
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| 63 | return 0; |
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| 64 | } |
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| 65 | /* If this error actually occurred while setting up the new |
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| 66 | * window, best let make_new_client() know not to bother */ |
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| 67 | if (initialising != None && e->resourceid == initialising) { |
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| 68 | LOG_DEBUG("\t **SAVED?** handle_xerror() caught error %d while initialising\n", e->error_code); |
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| 69 | initialising = None; |
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| 70 | return 0; |
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| 71 | } |
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| 72 | LOG_DEBUG("**ERK** handle_xerror() caught an XErrorEvent: error_code=%d request_code=%d minor_code=%d\n", |
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| 73 | e->error_code, e->request_code, e->minor_code); |
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| 74 | if (e->error_code == BadAccess && e->request_code == X_ChangeWindowAttributes) { |
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| 75 | LOG_ERROR("root window unavailable (maybe another wm is running?)\n"); |
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| 76 | exit(1); |
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| 77 | } |
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| 78 | |
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| 79 | c = find_client(e->resourceid); |
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| 80 | if (c) { |
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| 81 | LOG_DEBUG("\thandle_xerror() : flagging client for removal\n"); |
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| 82 | c->remove = 1; |
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| 83 | need_client_tidy = 1; |
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| 84 | } |
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| 85 | return 0; |
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| 86 | } |
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