OILS / cpp / core.cc View on Github | oilshell.org

392 lines, 245 significant
1// core.cc
2
3#include "cpp/core.h"
4
5#include <ctype.h> // ispunct()
6#include <errno.h>
7#include <math.h> // fmod()
8#include <pwd.h> // passwd
9#include <signal.h>
10#include <sys/resource.h> // getrusage
11#include <sys/select.h> // select(), FD_ISSET, FD_SET, FD_ZERO
12#include <sys/stat.h> // stat
13#include <sys/time.h> // gettimeofday
14#include <sys/times.h> // tms / times()
15#include <sys/utsname.h> // uname
16#include <sys/wait.h> // waitpid()
17#include <termios.h> // tcgetattr(), tcsetattr()
18#include <time.h> // time()
19#include <unistd.h> // getuid(), environ
20
21#include "_build/detected-cpp-config.h" // HAVE_PWENT
22#include "_gen/cpp/build_stamp.h" // gCommitHash
23#include "_gen/frontend/consts.h" // gVersion
24#include "cpp/embedded_file.h"
25
26extern char** environ;
27
28namespace pyos {
29
30SignalSafe* gSignalSafe = nullptr;
31
32Tuple2<int, int> WaitPid(int waitpid_options) {
33 int status;
34 int result = ::waitpid(-1, &status, WUNTRACED | waitpid_options);
35 if (result < 0) {
36 if (errno == EINTR && gSignalSafe->PollSigInt()) {
37 throw Alloc<KeyboardInterrupt>();
38 }
39 return Tuple2<int, int>(-1, errno);
40 }
41 return Tuple2<int, int>(result, status);
42}
43
44Tuple2<int, int> Read(int fd, int n, List<BigStr*>* chunks) {
45 BigStr* s = OverAllocatedStr(n); // Allocate enough for the result
46
47 int length = ::read(fd, s->data(), n);
48 if (length < 0) {
49 if (errno == EINTR && gSignalSafe->PollSigInt()) {
50 throw Alloc<KeyboardInterrupt>();
51 }
52 return Tuple2<int, int>(-1, errno);
53 }
54 if (length == 0) {
55 return Tuple2<int, int>(length, 0);
56 }
57
58 // Now we know how much data we got back
59 s->MaybeShrink(length);
60 chunks->append(s);
61
62 return Tuple2<int, int>(length, 0);
63}
64
65Tuple2<int, int> ReadByte(int fd) {
66 unsigned char buf[1];
67 ssize_t n = read(fd, &buf, 1);
68 if (n < 0) { // read error
69 if (errno == EINTR && gSignalSafe->PollSigInt()) {
70 throw Alloc<KeyboardInterrupt>();
71 }
72 return Tuple2<int, int>(-1, errno);
73 } else if (n == 0) { // EOF
74 return Tuple2<int, int>(EOF_SENTINEL, 0);
75 } else { // return character
76 return Tuple2<int, int>(buf[0], 0);
77 }
78}
79
80Dict<BigStr*, BigStr*>* Environ() {
81 auto d = Alloc<Dict<BigStr*, BigStr*>>();
82
83 for (char** env = environ; *env; ++env) {
84 char* pair = *env;
85
86 char* eq = strchr(pair, '=');
87 assert(eq != nullptr); // must look like KEY=value
88
89 int len = strlen(pair);
90
91 int key_len = eq - pair;
92 BigStr* key = StrFromC(pair, key_len);
93
94 int val_len = len - key_len - 1;
95 BigStr* val = StrFromC(eq + 1, val_len);
96
97 d->set(key, val);
98 }
99
100 return d;
101}
102
103int Chdir(BigStr* dest_dir) {
104 if (chdir(dest_dir->data_) == 0) {
105 return 0; // success
106 } else {
107 return errno;
108 }
109}
110
111BigStr* GetMyHomeDir() {
112 uid_t uid = getuid(); // always succeeds
113
114 // Don't free this. (May return a pointer to a static area)
115 struct passwd* entry = getpwuid(uid);
116 if (entry == nullptr) {
117 return nullptr;
118 }
119 BigStr* s = StrFromC(entry->pw_dir);
120 return s;
121}
122
123BigStr* GetHomeDir(BigStr* user_name) {
124 // Don't free this. (May return a pointer to a static area)
125 struct passwd* entry = getpwnam(user_name->data_);
126 if (entry == nullptr) {
127 return nullptr;
128 }
129 BigStr* s = StrFromC(entry->pw_dir);
130 return s;
131}
132
133List<PasswdEntry*>* GetAllUsers() {
134#ifdef HAVE_PWENT
135 auto* ret = NewList<PasswdEntry*>();
136 struct passwd* entry = nullptr;
137
138 setpwent();
139 while (true) {
140 errno = 0;
141 entry = getpwent();
142 if (entry == nullptr) {
143 if (errno == EINTR) {
144 continue; // try again
145 } else if (errno != 0) {
146 throw Alloc<OSError>(errno);
147 }
148 break;
149 }
150 ret->append(Alloc<PasswdEntry>(entry));
151 }
152 endpwent();
153
154 return ret;
155#else
156 fprintf(
157 stderr,
158 "Oils compiled without libc *pwent() functions. Can't list users.\n");
159 return NewList<PasswdEntry*>();
160#endif
161}
162
163BigStr* GetUserName(int uid) {
164 BigStr* result = kEmptyString;
165
166 if (passwd* pw = getpwuid(uid)) {
167 result = StrFromC(pw->pw_name);
168 } else {
169 throw Alloc<IOError>(errno);
170 }
171
172 return result;
173}
174
175BigStr* OsType() {
176 BigStr* result = kEmptyString;
177
178 utsname un = {};
179 if (::uname(&un) == 0) {
180 result = StrFromC(un.sysname);
181 } else {
182 throw Alloc<IOError>(errno);
183 }
184
185 return result;
186}
187
188Tuple3<double, double, double> Time() {
189 struct timeval now;
190 if (gettimeofday(&now, nullptr) < 0) {
191 throw Alloc<IOError>(errno); // could be a permission error
192 }
193 double real = now.tv_sec + static_cast<double>(now.tv_usec) / 1e6;
194
195 struct rusage ru;
196 if (::getrusage(RUSAGE_SELF, &ru) == -1) {
197 throw Alloc<IOError>(errno);
198 }
199 struct timeval* u = &(ru.ru_utime);
200 struct timeval* s = &(ru.ru_stime);
201
202 double user = u->tv_sec + static_cast<double>(u->tv_usec) / 1e6;
203 double sys = s->tv_sec + static_cast<double>(s->tv_usec) / 1e6;
204
205 return Tuple3<double, double, double>(real, user, sys);
206}
207
208static void PrintClock(clock_t ticks, long ticks_per_sec) {
209 double seconds = static_cast<double>(ticks) / ticks_per_sec;
210 printf("%ldm%.3fs", static_cast<long>(seconds) / 60, fmod(seconds, 60));
211}
212
213// bash source: builtins/times.def
214void PrintTimes() {
215 struct tms t;
216 if (times(&t) == -1) {
217 throw Alloc<IOError>(errno);
218 }
219 long ticks_per_sec = sysconf(_SC_CLK_TCK);
220
221 PrintClock(t.tms_utime, ticks_per_sec);
222 putc(' ', stdout);
223 PrintClock(t.tms_stime, ticks_per_sec);
224 putc('\n', stdout);
225 PrintClock(t.tms_cutime, ticks_per_sec);
226 putc(' ', stdout);
227 PrintClock(t.tms_cstime, ticks_per_sec);
228 putc('\n', stdout);
229}
230
231bool InputAvailable(int fd) {
232 fd_set fds;
233 FD_ZERO(&fds);
234 struct timeval timeout = {0}; // return immediately
235 FD_SET(fd, &fds);
236 return select(FD_SETSIZE, &fds, NULL, NULL, &timeout) > 0;
237}
238
239SignalSafe* InitSignalSafe() {
240 gSignalSafe = Alloc<SignalSafe>();
241 gHeap.RootGlobalVar(gSignalSafe);
242
243 RegisterSignalInterest(SIGINT); // for KeyboardInterrupt checks
244
245 return gSignalSafe;
246}
247
248void Sigaction(int sig_num, void (*handler)(int)) {
249 struct sigaction act = {};
250 act.sa_handler = handler;
251 if (sigaction(sig_num, &act, nullptr) != 0) {
252 throw Alloc<OSError>(errno);
253 }
254}
255
256static void signal_handler(int sig_num) {
257 assert(gSignalSafe != nullptr);
258 gSignalSafe->UpdateFromSignalHandler(sig_num);
259}
260
261void RegisterSignalInterest(int sig_num) {
262 struct sigaction act = {};
263 act.sa_handler = signal_handler;
264 assert(sigaction(sig_num, &act, nullptr) == 0);
265}
266
267Tuple2<BigStr*, int>* MakeDirCacheKey(BigStr* path) {
268 struct stat st;
269 if (::stat(path->data(), &st) == -1) {
270 throw Alloc<OSError>(errno);
271 }
272
273 return Alloc<Tuple2<BigStr*, int>>(path, st.st_mtime);
274}
275
276Tuple2<int, void*> PushTermAttrs(int fd, int mask) {
277 struct termios* term_attrs =
278 static_cast<struct termios*>(malloc(sizeof(struct termios)));
279
280 if (tcgetattr(fd, term_attrs) < 0) {
281 throw Alloc<OSError>(errno);
282 }
283 // Flip the bits in one field
284 int orig_local_modes = term_attrs->c_lflag;
285 term_attrs->c_lflag = orig_local_modes & mask;
286
287 if (tcsetattr(fd, TCSANOW, term_attrs) < 0) {
288 throw Alloc<OSError>(errno);
289 }
290
291 return Tuple2<int, void*>(orig_local_modes, term_attrs);
292}
293
294void PopTermAttrs(int fd, int orig_local_modes, void* term_attrs) {
295 struct termios* t = static_cast<struct termios*>(term_attrs);
296 t->c_lflag = orig_local_modes;
297 if (tcsetattr(fd, TCSANOW, t) < 0) {
298 ; // Like Python, ignore error because of issue #1001
299 }
300}
301
302} // namespace pyos
303
304namespace pyutil {
305
306static grammar::Grammar* gOilGrammar = nullptr;
307
308// TODO: SHARE with pyext
309bool IsValidCharEscape(BigStr* c) {
310 DCHECK(len(c) == 1);
311
312 int ch = c->data_[0];
313
314 if (ch == '/' || ch == '.' || ch == '-') {
315 return false;
316 }
317 if (ch == ' ') { // foo\ bar is idiomatic
318 return true;
319 }
320 return ispunct(ch);
321}
322
323BigStr* ChArrayToString(List<int>* ch_array) {
324 int n = len(ch_array);
325 BigStr* result = NewStr(n);
326 for (int i = 0; i < n; ++i) {
327 result->data_[i] = ch_array->at(i);
328 }
329 result->data_[n] = '\0';
330 return result;
331}
332
333BigStr* _ResourceLoader::Get(BigStr* path) {
334 TextFile* t = gEmbeddedFiles; // start of generated data
335 while (t->rel_path != nullptr) {
336 if (strcmp(t->rel_path, path->data_) == 0) {
337 return t->contents;
338 }
339 t++;
340 }
341 // Emulate Python
342 throw Alloc<IOError>(ENOENT);
343}
344
345_ResourceLoader* GetResourceLoader() {
346 return Alloc<_ResourceLoader>();
347}
348
349BigStr* GetVersion(_ResourceLoader* loader) {
350 return consts::gVersion;
351}
352
353void PrintVersionDetails(_ResourceLoader* loader) {
354 // Invoked by core/util.py VersionFlag()
355 printf("git commit = %s\n", gCommitHash);
356
357 // TODO: I would like the CPU, OS, compiler
358 // How do we get those? Look at CPython
359}
360
361BigStr* BackslashEscape(BigStr* s, BigStr* meta_chars) {
362 int upper_bound = len(s) * 2;
363 BigStr* buf = OverAllocatedStr(upper_bound);
364 char* p = buf->data_;
365
366 for (int i = 0; i < len(s); ++i) {
367 char c = s->data_[i];
368 if (memchr(meta_chars->data_, c, len(meta_chars))) {
369 *p++ = '\\';
370 }
371 *p++ = c;
372 }
373 buf->MaybeShrink(p - buf->data_);
374 return buf;
375}
376
377BigStr* strerror(IOError_OSError* e) {
378 BigStr* s = StrFromC(::strerror(e->errno_));
379 return s;
380}
381
382grammar::Grammar* LoadYshGrammar(_ResourceLoader*) {
383 if (gOilGrammar != nullptr) {
384 return gOilGrammar;
385 }
386
387 gOilGrammar = Alloc<grammar::Grammar>();
388 gHeap.RootGlobalVar(gOilGrammar);
389 return gOilGrammar;
390}
391
392} // namespace pyutil