Files: 5786b0b025e423f956afb157f1478abd951ddb2a / ccdl.c
4320 bytesRaw
1 | |
2 | |
3 | |
4 | |
5 | |
6 | |
7 | |
8 | |
9 | |
10 | |
11 | |
12 | |
13 | static unsigned int tmp_i = 0; |
14 | |
15 | static const char *mktemp() |
16 | { |
17 | const char *tmpdir = getenv("TMPDIR"); |
18 | if (!tmpdir) tmpdir = "/tmp"; |
19 | static char buf[256]; |
20 | if (snprintf(buf, sizeof(buf), "%s/ccdl-%d-%i.so", |
21 | tmpdir, getpid(), tmp_i++) < 0) return NULL; |
22 | return buf; |
23 | } |
24 | |
25 | void lib_init(struct lib *lib, const char *src_fname, const char *sym_name) |
26 | { |
27 | lib->src_fname = src_fname; |
28 | lib->lib_fname = NULL; |
29 | lib->sym_name = sym_name; |
30 | lib->handle = NULL; |
31 | lib->sym = NULL; |
32 | } |
33 | |
34 | static int compile(const char *src, const char *lib) |
35 | { |
36 | if (!src || !lib) return -1; |
37 | int child = fork(); |
38 | if (child < 0) return -1; |
39 | if (child == 0) { |
40 | char *const argv[] = { |
41 | "cc", (char *)src, "-o", (char *)lib, |
42 | "-fPIC", "-shared", "-lm", "-std=c99", |
43 | NULL}; |
44 | return execvp(argv[0], argv); |
45 | } else { |
46 | int wstatus; |
47 | if (waitpid(child, &wstatus, 0) < 0) { |
48 | return -1; |
49 | } else if (WIFEXITED(wstatus) && WEXITSTATUS(wstatus) == 0) { |
50 | return 0; |
51 | } else { |
52 | return -1; |
53 | } |
54 | } |
55 | } |
56 | |
57 | int lib_build(struct lib *lib) |
58 | { |
59 | void *handle = lib->handle; |
60 | if (!handle) { |
61 | const char *lib_fname = lib->lib_fname; |
62 | if (!lib_fname) { |
63 | const char *src_fname = lib->src_fname; |
64 | if (!src_fname) return -1; |
65 | lib_fname = mktemp(); |
66 | if (!lib_fname) return -1; |
67 | lib->lib_fname = lib_fname; |
68 | if (compile(src_fname, lib_fname)) return -1; |
69 | } |
70 | handle = dlopen(lib_fname, RTLD_NOW); |
71 | lib->handle = handle; |
72 | } |
73 | const char *sym_name = lib->sym_name; |
74 | if (!sym_name) return -1; |
75 | void *sym = dlsym(handle, sym_name); |
76 | if (!sym) return -1; |
77 | lib->sym = sym; |
78 | return 0; |
79 | } |
80 | |
81 | void *lib_get(struct lib *lib) |
82 | { |
83 | if (!lib->sym) lib_build(lib); |
84 | return lib->sym; |
85 | } |
86 | |
87 | void lib_deinit(struct lib *lib) |
88 | { |
89 | if (lib->handle) { |
90 | dlclose(lib->handle); |
91 | lib->handle = NULL; |
92 | lib->sym = NULL; |
93 | } |
94 | if (lib->lib_fname) { |
95 | unlink(lib->lib_fname); |
96 | lib->lib_fname = NULL; |
97 | } |
98 | } |
99 | |
100 | void ccdl_init(struct ccdl *ccdl, const char *src_fname, const char *sym_name) |
101 | { |
102 | lib_init(&ccdl->libs[0], src_fname, sym_name); |
103 | lib_init(&ccdl->libs[1], src_fname, sym_name); |
104 | ccdl->lib = &ccdl->libs[0]; |
105 | } |
106 | |
107 | static struct lib *ccdl_get_old_lib(struct ccdl *ccdl) |
108 | { |
109 | return ccdl->lib == &ccdl->libs[1] ? &ccdl->libs[0] : &ccdl->libs[1]; |
110 | } |
111 | |
112 | void *ccdl_get(struct ccdl *ccdl) |
113 | { |
114 | struct lib *old_lib = ccdl_get_old_lib(ccdl); |
115 | if (old_lib) { |
116 | lib_deinit(old_lib); |
117 | } |
118 | return lib_get(ccdl->lib); |
119 | } |
120 | |
121 | static int ccdl_watch_run(struct ccdl *ccdl) |
122 | { |
123 | int ifd = inotify_init(); |
124 | int wd = 0; |
125 | if (ifd < 0) { |
126 | warn("inotify_init"); |
127 | return -1; |
128 | } |
129 | if (!ccdl || !ccdl->lib || !ccdl->lib->src_fname) { |
130 | warn("missing lib filename"); |
131 | return -1; |
132 | } |
133 | wd = inotify_add_watch(ifd, ccdl->lib->src_fname, IN_MODIFY); |
134 | if (wd < 0) { |
135 | warn("watch"); |
136 | return -1; |
137 | } |
138 | |
139 | while (1) { |
140 | struct inotify_event ev; |
141 | ssize_t len = read(ifd, &ev, sizeof ev); |
142 | //printf("readed %zd %u %u %u\n", len, sizeof ev, ev.len, ev.mask); |
143 | if (len < 0) { |
144 | warn("read"); |
145 | return -1; |
146 | } |
147 | if (len < sizeof ev) { |
148 | warn("small read"); |
149 | continue; |
150 | } |
151 | if (ev.len > 0) { |
152 | warn("unexpected name"); |
153 | return -1; |
154 | } |
155 | if (ev.mask & IN_MODIFY) { |
156 | } else if (ev.mask & IN_DELETE_SELF) { |
157 | printf("deleted\n"); |
158 | } else if (ev.mask & IN_IGNORED) { |
159 | printf("ignored\n"); |
160 | // file is being replaced. replace the watch |
161 | wd = inotify_add_watch(ifd, ccdl->lib->src_fname, IN_MODIFY); |
162 | if (wd < 0) { |
163 | warn("inotify_add_watch"); |
164 | return -1; |
165 | } |
166 | } else { |
167 | printf("unknown mask: %u\n", ev.mask); |
168 | } |
169 | (void)ccdl_rebuild(ccdl); |
170 | } |
171 | |
172 | return 0; |
173 | } |
174 | |
175 | static void *ccdl_watch_run_thread(void *ccdl) |
176 | { |
177 | return (void *)ccdl_watch_run(ccdl); |
178 | } |
179 | |
180 | int ccdl_watch(struct ccdl *ccdl) |
181 | { |
182 | pthread_t *id = &ccdl->watcher_thread; |
183 | if (pthread_create(id, NULL, ccdl_watch_run_thread, ccdl)) return -1; |
184 | return 0; |
185 | } |
186 | |
187 | int ccdl_rebuild(struct ccdl *ccdl) |
188 | { |
189 | struct lib *old_lib, *new_lib; |
190 | old_lib = ccdl->lib; |
191 | new_lib = ccdl_get_old_lib(ccdl); |
192 | lib_deinit(new_lib); |
193 | if (lib_build(new_lib) < 0) return -1; |
194 | ccdl->lib = new_lib; |
195 | return 0; |
196 | } |
197 | |
198 | int ccdl_deinit(struct ccdl *ccdl) |
199 | { |
200 | pthread_t thread = ccdl->watcher_thread; |
201 | if (thread) { |
202 | void *retval; |
203 | pthread_join(thread, &retval); |
204 | return (int)retval; |
205 | } |
206 | return 0; |
207 | } |
208 | |
209 |
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