io.c revision 1.14 1 /* $NetBSD: io.c,v 1.14 2017/06/23 00:18:01 kamil Exp $ */
2
3 /*
4 * shell buffered IO and formatted output
5 */
6 #include <sys/cdefs.h>
7
8 #ifndef lint
9 __RCSID("$NetBSD: io.c,v 1.14 2017/06/23 00:18:01 kamil Exp $");
10 #endif
11
12
13 #include <ctype.h>
14 #include "sh.h"
15 #include "ksh_stat.h"
16
17 static int initio_done;
18
19 /*
20 * formatted output functions
21 */
22
23
24 /* A shell error occurred (eg, syntax error, etc.) */
25 void
26 #ifdef HAVE_PROTOTYPES
27 errorf(const char *fmt, ...)
28 #else
29 errorf(fmt, va_alist)
30 const char *fmt;
31 va_dcl
32 #endif
33 {
34 va_list va;
35
36 shl_stdout_ok = 0; /* debugging: note that stdout not valid */
37 exstat = 1;
38 if (*fmt) {
39 error_prefix(TRUE);
40 va_start(va, fmt);
41 shf_vfprintf(shl_out, fmt, va);
42 va_end(va);
43 shf_putchar('\n', shl_out);
44 }
45 shf_flush(shl_out);
46 unwind(LERROR);
47 }
48
49 /* like errorf(), but no unwind is done */
50 void
51 #ifdef HAVE_PROTOTYPES
52 warningf(int fileline, const char *fmt, ...)
53 #else
54 warningf(fileline, fmt, va_alist)
55 int fileline;
56 const char *fmt;
57 va_dcl
58 #endif
59 {
60 va_list va;
61
62 error_prefix(fileline);
63 va_start(va, fmt);
64 shf_vfprintf(shl_out, fmt, va);
65 va_end(va);
66 shf_putchar('\n', shl_out);
67 shf_flush(shl_out);
68 }
69
70 /* Used by built-in utilities to prefix shell and utility name to message
71 * (also unwinds environments for special builtins).
72 */
73 void
74 #ifdef HAVE_PROTOTYPES
75 bi_errorf(const char *fmt, ...)
76 #else
77 bi_errorf(fmt, va_alist)
78 const char *fmt;
79 va_dcl
80 #endif
81 {
82 va_list va;
83
84 shl_stdout_ok = 0; /* debugging: note that stdout not valid */
85 exstat = 1;
86 if (*fmt) {
87 error_prefix(TRUE);
88 /* not set when main() calls parse_args() */
89 if (builtin_argv0)
90 shf_fprintf(shl_out, "%s: ", builtin_argv0);
91 va_start(va, fmt);
92 shf_vfprintf(shl_out, fmt, va);
93 va_end(va);
94 shf_putchar('\n', shl_out);
95 }
96 shf_flush(shl_out);
97 /* POSIX special builtins and ksh special builtins cause
98 * non-interactive shells to exit.
99 * XXX odd use of KEEPASN; also may not want LERROR here
100 */
101 if ((builtin_flag & SPEC_BI)
102 || (Flag(FPOSIX) && (builtin_flag & KEEPASN)))
103 {
104 builtin_argv0 = (char *) 0;
105 unwind(LERROR);
106 }
107 }
108
109 /* Called when something that shouldn't happen does */
110 void
111 #ifdef HAVE_PROTOTYPES
112 internal_errorf(int jump, const char *fmt, ...)
113 #else
114 internal_errorf(jump, fmt, va_alist)
115 int jump;
116 const char *fmt;
117 va_dcl
118 #endif
119 {
120 va_list va;
121
122 error_prefix(TRUE);
123 shf_fprintf(shl_out, "internal error: ");
124 va_start(va, fmt);
125 shf_vfprintf(shl_out, fmt, va);
126 va_end(va);
127 shf_putchar('\n', shl_out);
128 shf_flush(shl_out);
129 if (jump)
130 unwind(LERROR);
131 }
132
133 /* used by error reporting functions to print "ksh: .kshrc[25]: " */
134 void
135 error_prefix(fileline)
136 int fileline;
137 {
138 /* Avoid foo: foo[2]: ... */
139 if (!fileline || !source || !source->file
140 || strcmp(source->file, kshname) != 0)
141 shf_fprintf(shl_out, "%s: ", kshname + (*kshname == '-'));
142 if (fileline && source && source->file != NULL) {
143 shf_fprintf(shl_out, "%s[%d]: ", source->file,
144 source->errline > 0 ? source->errline : source->line);
145 source->errline = 0;
146 }
147 }
148
149 /* printf to shl_out (stderr) with flush */
150 void
151 #ifdef HAVE_PROTOTYPES
152 shellf(const char *fmt, ...)
153 #else
154 shellf(fmt, va_alist)
155 const char *fmt;
156 va_dcl
157 #endif
158 {
159 va_list va;
160
161 if (!initio_done) /* shl_out may not be set up yet... */
162 return;
163 va_start(va, fmt);
164 shf_vfprintf(shl_out, fmt, va);
165 va_end(va);
166 shf_flush(shl_out);
167 }
168
169 /* printf to shl_stdout (stdout) */
170 void
171 #ifdef HAVE_PROTOTYPES
172 shprintf(const char *fmt, ...)
173 #else
174 shprintf(fmt, va_alist)
175 const char *fmt;
176 va_dcl
177 #endif
178 {
179 va_list va;
180
181 if (!shl_stdout_ok)
182 internal_errorf(1, "shl_stdout not valid");
183 va_start(va, fmt);
184 shf_vfprintf(shl_stdout, fmt, va);
185 va_end(va);
186 }
187
188 #ifdef KSH_DEBUG
189 static struct shf *kshdebug_shf;
190
191 void
192 kshdebug_init_()
193 {
194 if (kshdebug_shf)
195 shf_close(kshdebug_shf);
196 kshdebug_shf = shf_open("/tmp/ksh-debug.log",
197 O_WRONLY|O_APPEND|O_CREAT, 0600,
198 SHF_WR|SHF_MAPHI);
199 if (kshdebug_shf) {
200 shf_fprintf(kshdebug_shf, "\nNew shell[pid %d]\n", getpid());
201 shf_flush(kshdebug_shf);
202 }
203 }
204
205 /* print to debugging log */
206 void
207 # ifdef HAVE_PROTOTYPES
208 kshdebug_printf_(const char *fmt, ...)
209 # else
210 kshdebug_printf_(fmt, va_alist)
211 const char *fmt;
212 va_dcl
213 # endif
214 {
215 va_list va;
216
217 if (!kshdebug_shf)
218 return;
219 va_start(va, fmt);
220 shf_fprintf(kshdebug_shf, "[%d] ", getpid());
221 shf_vfprintf(kshdebug_shf, fmt, va);
222 va_end(va);
223 shf_flush(kshdebug_shf);
224 }
225
226 void
227 kshdebug_dump_(str, mem, nbytes)
228 const char *str;
229 const void *mem;
230 int nbytes;
231 {
232 int i, j;
233 int nprow = 16;
234
235 if (!kshdebug_shf)
236 return;
237 shf_fprintf(kshdebug_shf, "[%d] %s:\n", getpid(), str);
238 for (i = 0; i < nbytes; i += nprow) {
239 char c = '\t';
240 for (j = 0; j < nprow && i + j < nbytes; j++) {
241 shf_fprintf(kshdebug_shf, "%c%02x",
242 c, ((const unsigned char *) mem)[i + j]);
243 c = ' ';
244 }
245 shf_fprintf(kshdebug_shf, "\n");
246 }
247 shf_flush(kshdebug_shf);
248 }
249 #endif /* KSH_DEBUG */
250
251 /* test if we can seek backwards fd (returns 0 or SHF_UNBUF) */
252 int
253 can_seek(fd)
254 int fd;
255 {
256 struct stat statb;
257
258 return fstat(fd, &statb) == 0 && !S_ISREG(statb.st_mode) ?
259 SHF_UNBUF : 0;
260 }
261
262 struct shf shf_iob[3];
263
264 void
265 initio()
266 {
267 shf_fdopen(1, SHF_WR, shl_stdout); /* force buffer allocation */
268 shf_fdopen(2, SHF_WR, shl_out);
269 shf_fdopen(2, SHF_WR, shl_spare); /* force buffer allocation */
270 initio_done = 1;
271 kshdebug_init();
272 }
273
274 /* A dup2() with error checking */
275 int
276 ksh_dup2(ofd, nfd, errok)
277 int ofd;
278 int nfd;
279 int errok;
280 {
281 int ret = dup2(ofd, nfd);
282
283 if (ret < 0 && errno != EBADF && !errok)
284 errorf("too many files open in shell");
285
286 return ret;
287 }
288
289 /*
290 * move fd from user space (0<=fd<10) to shell space (fd>=10),
291 * set close-on-exec flag.
292 */
293 int
294 savefd(fd, noclose)
295 int fd;
296 int noclose;
297 {
298 int nfd;
299
300 if (fd < FDBASE) {
301 nfd = ksh_dupbase(fd, FDBASE);
302 if (nfd < 0) {
303 if (errno == EBADF)
304 return -1;
305 else
306 errorf("too many files open in shell");
307 }
308 if (!noclose)
309 close(fd);
310 } else
311 nfd = fd;
312 fd_clexec(nfd);
313 return nfd;
314 }
315
316 void
317 restfd(fd, ofd)
318 int fd, ofd;
319 {
320 if (fd == 2)
321 shf_flush(&shf_iob[fd]);
322 if (ofd < 0) /* original fd closed */
323 close(fd);
324 else if (fd != ofd) {
325 ksh_dup2(ofd, fd, TRUE); /* XXX: what to do if this fails? */
326 close(ofd);
327 }
328 }
329
330 void
331 openpipe(pv)
332 register int *pv;
333 {
334 if (pipe(pv) < 0)
335 errorf("can't create pipe - try again");
336 pv[0] = savefd(pv[0], 0);
337 pv[1] = savefd(pv[1], 0);
338 }
339
340 void
341 closepipe(pv)
342 register int *pv;
343 {
344 close(pv[0]);
345 close(pv[1]);
346 }
347
348 /* Called by iosetup() (deals with 2>&4, etc.), c_read, c_print to turn
349 * a string (the X in 2>&X, read -uX, print -uX) into a file descriptor.
350 */
351 int
352 check_fd(name, mode, emsgp)
353 char *name;
354 int mode;
355 const char **emsgp;
356 {
357 int fd, fl;
358
359 if (isdigit((unsigned char)name[0]) && !name[1]) {
360 fd = name[0] - '0';
361 if ((fl = fcntl(fd = name[0] - '0', F_GETFL, 0)) < 0) {
362 if (emsgp)
363 *emsgp = "bad file descriptor";
364 return -1;
365 }
366 fl &= O_ACCMODE;
367
368 /* X_OK is a kludge to disable this check for dups (x<&1):
369 * historical shells never did this check (XXX don't know what
370 * posix has to say).
371 */
372 if (!(mode & X_OK) && fl != O_RDWR
373 && (((mode & R_OK) && fl != O_RDONLY)
374 || ((mode & W_OK) && fl != O_WRONLY)))
375 {
376 if (emsgp)
377 *emsgp = (fl == O_WRONLY) ?
378 "fd not open for reading"
379 : "fd not open for writing";
380 return -1;
381 }
382 return fd;
383 }
384 #ifdef KSH
385 else if (name[0] == 'p' && !name[1])
386 return coproc_getfd(mode, emsgp);
387 #endif /* KSH */
388 if (emsgp)
389 *emsgp = "illegal file descriptor name";
390 return -1;
391 }
392
393 #ifdef KSH
394 /* Called once from main */
395 void
396 coproc_init()
397 {
398 coproc.read = coproc.readw = coproc.write = -1;
399 coproc.njobs = 0;
400 coproc.id = 0;
401 }
402
403 /* Called by c_read() when eof is read - close fd if it is the co-process fd */
404 void
405 coproc_read_close(fd)
406 int fd;
407 {
408 if (coproc.read >= 0 && fd == coproc.read) {
409 coproc_readw_close(fd);
410 close(coproc.read);
411 coproc.read = -1;
412 }
413 }
414
415 /* Called by c_read() and by iosetup() to close the other side of the
416 * read pipe, so reads will actually terminate.
417 */
418 void
419 coproc_readw_close(fd)
420 int fd;
421 {
422 if (coproc.readw >= 0 && coproc.read >= 0 && fd == coproc.read) {
423 close(coproc.readw);
424 coproc.readw = -1;
425 }
426 }
427
428 /* Called by c_print when a write to a fd fails with EPIPE and by iosetup
429 * when co-process input is dup'd
430 */
431 void
432 coproc_write_close(fd)
433 int fd;
434 {
435 if (coproc.write >= 0 && fd == coproc.write) {
436 close(coproc.write);
437 coproc.write = -1;
438 }
439 }
440
441 /* Called to check for existence of/value of the co-process file descriptor.
442 * (Used by check_fd() and by c_read/c_print to deal with -p option).
443 */
444 int
445 coproc_getfd(mode, emsgp)
446 int mode;
447 const char **emsgp;
448 {
449 int fd = (mode & R_OK) ? coproc.read : coproc.write;
450
451 if (fd >= 0)
452 return fd;
453 if (emsgp)
454 *emsgp = "no coprocess";
455 return -1;
456 }
457
458 /* called to close file descriptors related to the coprocess (if any)
459 * Should be called with SIGCHLD blocked.
460 */
461 void
462 coproc_cleanup(reuse)
463 int reuse;
464 {
465 /* This to allow co-processes to share output pipe */
466 if (!reuse || coproc.readw < 0 || coproc.read < 0) {
467 if (coproc.read >= 0) {
468 close(coproc.read);
469 coproc.read = -1;
470 }
471 if (coproc.readw >= 0) {
472 close(coproc.readw);
473 coproc.readw = -1;
474 }
475 }
476 if (coproc.write >= 0) {
477 close(coproc.write);
478 coproc.write = -1;
479 }
480 }
481 #endif /* KSH */
482
483
484 /*
485 * temporary files
486 */
487
488 struct temp *
489 maketemp(ap, type, tlist)
490 Area *ap;
491 Temp_type type;
492 struct temp **tlist;
493 {
494 #ifndef __NetBSD__
495 static unsigned int inc;
496 #endif
497 struct temp *tp;
498 int len;
499 int fd;
500 char *pathx;
501 const char *dir;
502
503 dir = tmpdir ? tmpdir : "/tmp";
504 /* The 20 + 20 is a paranoid worst case for pid/inc */
505 len = strlen(dir) + 3 + 20 + 20 + 1;
506 tp = (struct temp *) alloc(sizeof(struct temp) + len, ap);
507 tp->name = pathx = (char *) &tp[1];
508 tp->shf = (struct shf *) 0;
509 tp->type = type;
510 #ifdef __NetBSD__
511 shf_snprintf(pathx, len, "%s/shXXXXXXXX", dir);
512 fd = mkstemp(pathx);
513 if (fd >= 0)
514 tp->shf = shf_fdopen(fd, SHF_WR, (struct shf *) 0);
515 #else
516 while (1) {
517 /* Note that temp files need to fit 8.3 DOS limits */
518 shf_snprintf(pathx, len, "%s/sh%05u.%03x",
519 dir, (unsigned) procpid, inc++);
520 /* Mode 0600 to be paranoid, O_TRUNC in case O_EXCL isn't
521 * really there.
522 */
523 fd = open(pathx, O_RDWR|O_CREAT|O_EXCL|O_TRUNC, 0600);
524 if (fd >= 0) {
525 tp->shf = shf_fdopen(fd, SHF_WR, (struct shf *) 0);
526 break;
527 }
528 if (errno != EINTR
529 #ifdef EEXIST
530 && errno != EEXIST
531 #endif /* EEXIST */
532 #ifdef EISDIR
533 && errno != EISDIR
534 #endif /* EISDIR */
535 )
536 /* Error must be printed by caller: don't know here if
537 * errorf() or bi_errorf() should be used.
538 */
539 break;
540 }
541 #endif /* __NetBSD__ */
542 tp->pid = procpid;
543
544 tp->next = *tlist;
545 *tlist = tp;
546
547 return tp;
548 }
549