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annotate dglwatcher.c @ 203:5491ca3a335b

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Fail cleanly if necessary files can't be opened.
author John "Elwin" Edwards
date Wed, 04 Jan 2017 21:25:43 -0500
parents fba1b34e7554
children
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245a2959f504 Begin support for watching dgamelaunch games.
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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include <string.h>
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4 #include <sys/inotify.h>
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5 #include <sys/select.h>
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6 #include <unistd.h>
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7 #include <limits.h>
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8 #include <dirent.h>
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9
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10 struct watchdir {
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11 int wd;
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12 char *name;
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13 };
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14
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15 char ibuf[sizeof(struct inotify_event) + NAME_MAX + 1];
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16
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17 int startwatch(int ifd, char *dir, struct watchdir *w) {
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18 DIR *dstream;
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19 struct dirent *ent;
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20
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21 w->name = dir;
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22 w->wd = inotify_add_watch(ifd, dir, IN_CREATE|IN_DELETE|IN_DELETE_SELF);
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23 if (w->wd < 0) {
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24 fprintf(stderr, "Could not watch %s\n", dir);
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25 return 1;
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26 }
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27 dstream = opendir(dir);
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28 if (dstream == NULL) {
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29 fprintf(stderr, "%s is not a readable directory\n", dir);
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30 inotify_rm_watch(ifd, w->wd);
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31 w->wd = -1;
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32 return 1;
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33 }
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34 ent = readdir(dstream);
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35 while (ent != NULL) {
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36 if (strcmp(ent->d_name, ".") && strcmp(ent->d_name, ".."))
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37 printf("E %s/%s\n", dir, ent->d_name);
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38 ent = readdir(dstream);
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39 }
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40 closedir(dstream);
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41 fflush(stdout);
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42 return 0;
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43 }
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44
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45 int main(int argc, char *argv[]) {
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46 int ifd, rsize, off, done, nwatchers, i, result;
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47 char typecode;
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48 struct inotify_event *iev;
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49 fd_set rfds;
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50 struct watchdir *watchers;
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51
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52 done = 0;
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53 nwatchers = argc - 1;
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54 iev = (struct inotify_event *) ibuf;
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55 ifd = inotify_init();
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56 if (nwatchers == 0) {
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57 watchers = malloc(sizeof(struct watchdir));
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58 nwatchers = 1;
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59 startwatch(ifd, ".", watchers);
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60 }
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61 else {
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62 watchers = malloc(nwatchers * sizeof(struct watchdir));
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63 for (i = 0; i < nwatchers; i++) {
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64 startwatch(ifd, argv[i+1], watchers + i);
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65 }
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66 }
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67
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68 while (!done) {
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69 FD_ZERO(&rfds);
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70 FD_SET(0, &rfds);
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71 FD_SET(ifd, &rfds);
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72 result = select(ifd + 1, &rfds, NULL, NULL, NULL);
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73 if (result < 0) {
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74 /* Something went wrong. */
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75 break;
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76 }
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77 if (FD_ISSET(ifd, &rfds)) {
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78 off = 0;
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79 rsize = read(ifd, ibuf, sizeof(struct inotify_event) + NAME_MAX + 1);
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80 while (off < rsize) {
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81 iev = (struct inotify_event *) (ibuf + off);
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82 if (iev->mask & IN_CREATE)
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83 typecode = 'C';
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84 else if (iev->mask & IN_DELETE)
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85 typecode = 'D';
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86 else
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87 typecode = '?';
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88 for (i = 0; i < nwatchers; i++) {
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89 if (watchers[i].wd == iev->wd)
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90 printf("%c %s/%s\n", typecode, watchers[i].name, iev->name);
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91 }
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92 off += sizeof(struct inotify_event) + iev->len;
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93 }
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94 fflush(stdout);
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95 }
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96 if (FD_ISSET(0, &rfds)) {
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97 result = read(0, &typecode, 1);
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98 if (result <= 0) {
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99 /* EOF on stdin: controlling process probably died. */
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100 done = 1;
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101 }
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