1: /* Substitute for and wrapper around <unistd.h>.
2: Copyright (C) 2003-2009 Free Software Foundation, Inc.
3:
4: This program is free software; you can redistribute it and/or modify
5: it under the terms of the GNU General Public License as published by
6: the Free Software Foundation; either version 3, or (at your option)
7: any later version.
8:
9: This program is distributed in the hope that it will be useful,
10: but WITHOUT ANY WARRANTY; without even the implied warranty of
11: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12: GNU General Public License for more details.
13:
14: You should have received a copy of the GNU General Public License
15: along with this program; if not, write to the Free Software Foundation,
16: Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
17:
18: #ifndef _GL_UNISTD_H
19:
20: #if __GNUC__ >= 3
21: @PRAGMA_SYSTEM_HEADER@
22: #endif
23:
24: /* The include_next requires a split double-inclusion guard. */
25: #if @HAVE_UNISTD_H@
26: # @INCLUDE_NEXT@ @NEXT_UNISTD_H@
27: #endif
28:
29: #ifndef _GL_UNISTD_H
30: #define _GL_UNISTD_H
31:
32: /* mingw doesn't define the SEEK_* or *_FILENO macros in <unistd.h>. */
33: #if !(defined SEEK_CUR && defined SEEK_END && defined SEEK_SET)
34: # include <stdio.h>
35: #endif
36:
37: /* mingw fails to declare _exit in <unistd.h>. */
38: /* mingw, BeOS, Haiku declare environ in <stdlib.h>, not in <unistd.h>. */
39: #include <stdlib.h>
40:
41: #if @GNULIB_WRITE@ && @REPLACE_WRITE@ && @GNULIB_UNISTD_H_SIGPIPE@
42: /* Get ssize_t. */
43: # include <sys/types.h>
44: #endif
45:
46: #if @GNULIB_GETHOSTNAME@
47: /* Get all possible declarations of gethostname(). */
48: # if @UNISTD_H_HAVE_WINSOCK2_H@
49: # include <winsock2.h>
50: # if !defined _GL_SYS_SOCKET_H
51: # undef socket
52: # define socket socket_used_without_including_sys_socket_h
53: # undef connect
54: # define connect connect_used_without_including_sys_socket_h
55: # undef accept
56: # define accept accept_used_without_including_sys_socket_h
57: # undef bind
58: # define bind bind_used_without_including_sys_socket_h
59: # undef getpeername
60: # define getpeername getpeername_used_without_including_sys_socket_h
61: # undef getsockname
62: # define getsockname getsockname_used_without_including_sys_socket_h
63: # undef getsockopt
64: # define getsockopt getsockopt_used_without_including_sys_socket_h
65: # undef listen
66: # define listen listen_used_without_including_sys_socket_h
67: # undef recv
68: # define recv recv_used_without_including_sys_socket_h
69: # undef send
70: # define send send_used_without_including_sys_socket_h
71: # undef recvfrom
72: # define recvfrom recvfrom_used_without_including_sys_socket_h
73: # undef sendto
74: # define sendto sendto_used_without_including_sys_socket_h
75: # undef setsockopt
76: # define setsockopt setsockopt_used_without_including_sys_socket_h
77: # undef shutdown
78: # define shutdown shutdown_used_without_including_sys_socket_h
79: # endif
80: # if !defined _GL_SYS_SELECT_H
81: # undef select
82: # define select select_used_without_including_sys_select_h
83: # endif
84: # endif
85: #endif
86:
87: /* The definition of GL_LINK_WARNING is copied here. */
88:
89:
90: /* OS/2 EMX lacks these macros. */
91: #ifndef STDIN_FILENO
92: # define STDIN_FILENO 0
93: #endif
94: #ifndef STDOUT_FILENO
95: # define STDOUT_FILENO 1
96: #endif
97: #ifndef STDERR_FILENO
98: # define STDERR_FILENO 2
99: #endif
100:
101: /* Declare overridden functions. */
102:
103: #ifdef __cplusplus
104: extern "C" {
105: #endif
106:
107:
108: #if @GNULIB_CHOWN@
109: # if @REPLACE_CHOWN@
110: # ifndef REPLACE_CHOWN
111: # define REPLACE_CHOWN 1
112: # endif
113: # if REPLACE_CHOWN
114: /* Change the owner of FILE to UID (if UID is not -1) and the group of FILE
115: to GID (if GID is not -1). Follow symbolic links.
116: Return 0 if successful, otherwise -1 and errno set.
117: See the POSIX:2001 specification
118: <http://www.opengroup.org/susv3xsh/chown.html>. */
119: # define chown rpl_chown
120: extern int chown (const char *file, uid_t uid, gid_t gid);
121: # endif
122: # endif
123: #elif defined GNULIB_POSIXCHECK
124: # undef chown
125: # define chown(f,u,g) \
126: (GL_LINK_WARNING ("chown fails to follow symlinks on some systems and " \
127: "doesn't treat a uid or gid of -1 on some systems - " \
128: "use gnulib module chown for portability"), \
129: chown (f, u, g))
130: #endif
131:
132:
133: #if @GNULIB_CLOSE@
134: # if @REPLACE_CLOSE@
135: /* Automatically included by modules that need a replacement for close. */
136: # undef close
137: # define close rpl_close
138: extern int close (int);
139: # endif
140: #elif @UNISTD_H_HAVE_WINSOCK2_H@
141: # undef close
142: # define close close_used_without_requesting_gnulib_module_close
143: #elif defined GNULIB_POSIXCHECK
144: # undef close
145: # define close(f) \
146: (GL_LINK_WARNING ("close does not portably work on sockets - " \
147: "use gnulib module close for portability"), \
148: close (f))
149: #endif
150:
151:
152: #if @GNULIB_DUP2@
153: # if !@HAVE_DUP2@
154: /* Copy the file descriptor OLDFD into file descriptor NEWFD. Do nothing if
155: NEWFD = OLDFD, otherwise close NEWFD first if it is open.
156: Return 0 if successful, otherwise -1 and errno set.
157: See the POSIX:2001 specification
158: <http://www.opengroup.org/susv3xsh/dup2.html>. */
159: extern int dup2 (int oldfd, int newfd);
160: # endif
161: #elif defined GNULIB_POSIXCHECK
162: # undef dup2
163: # define dup2(o,n) \
164: (GL_LINK_WARNING ("dup2 is unportable - " \
165: "use gnulib module dup2 for portability"), \
166: dup2 (o, n))
167: #endif
168:
169:
170: #if @GNULIB_ENVIRON@
171: # if !@HAVE_DECL_ENVIRON@
172: /* Set of environment variables and values. An array of strings of the form
173: "VARIABLE=VALUE", terminated with a NULL. */
174: # if defined __APPLE__ && defined __MACH__
175: # include <crt_externs.h>
176: # define environ (*_NSGetEnviron ())
177: # else
178: extern char **environ;
179: # endif
180: # endif
181: #elif defined GNULIB_POSIXCHECK
182: # undef environ
183: # define environ \
184: (GL_LINK_WARNING ("environ is unportable - " \
185: "use gnulib module environ for portability"), \
186: environ)
187: #endif
188:
189:
190: #if @GNULIB_EUIDACCESS@
191: # if !@HAVE_EUIDACCESS@
192: /* Like access(), except that is uses the effective user id and group id of
193: the current process. */
194: extern int euidaccess (const char *filename, int mode);
195: # endif
196: #elif defined GNULIB_POSIXCHECK
197: # undef euidaccess
198: # define euidaccess(f,m) \
199: (GL_LINK_WARNING ("euidaccess is unportable - " \
200: "use gnulib module euidaccess for portability"), \
201: euidaccess (f, m))
202: #endif
203:
204:
205: #if @GNULIB_FCHDIR@
206: # if @REPLACE_FCHDIR@
207:
208: /* Change the process' current working directory to the directory on which
209: the given file descriptor is open.
210: Return 0 if successful, otherwise -1 and errno set.
211: See the POSIX:2001 specification
212: <http://www.opengroup.org/susv3xsh/fchdir.html>. */
213: extern int fchdir (int /*fd*/);
214:
215: # define dup rpl_dup
216: extern int dup (int);
217: # define dup2 rpl_dup2
218: extern int dup2 (int, int);
219:
220: # endif
221: #elif defined GNULIB_POSIXCHECK
222: # undef fchdir
223: # define fchdir(f) \
224: (GL_LINK_WARNING ("fchdir is unportable - " \
225: "use gnulib module fchdir for portability"), \
226: fchdir (f))
227: #endif
228:
229:
230: #if @GNULIB_FSYNC@
231: /* Synchronize changes to a file.
232: Return 0 if successful, otherwise -1 and errno set.
233: See POSIX:2001 specification
234: <http://www.opengroup.org/susv3xsh/fsync.html>. */
235: # if !@HAVE_FSYNC@
236: extern int fsync (int fd);
237: # endif
238: #elif defined GNULIB_POSIXCHECK
239: # undef fsync
240: # define fsync(fd) \
241: (GL_LINK_WARNING ("fsync is unportable - " \
242: "use gnulib module fsync for portability"), \
243: fsync (fd))
244: #endif
245:
246:
247: #if @GNULIB_FTRUNCATE@
248: # if !@HAVE_FTRUNCATE@
249: /* Change the size of the file to which FD is opened to become equal to LENGTH.
250: Return 0 if successful, otherwise -1 and errno set.
251: See the POSIX:2001 specification
252: <http://www.opengroup.org/susv3xsh/ftruncate.html>. */
253: extern int ftruncate (int fd, off_t length);
254: # endif
255: #elif defined GNULIB_POSIXCHECK
256: # undef ftruncate
257: # define ftruncate(f,l) \
258: (GL_LINK_WARNING ("ftruncate is unportable - " \
259: "use gnulib module ftruncate for portability"), \
260: ftruncate (f, l))
261: #endif
262:
263:
264: #if @GNULIB_GETCWD@
265: /* Include the headers that might declare getcwd so that they will not
266: cause confusion if included after this file. */
267: # include <stdlib.h>
268: # if @REPLACE_GETCWD@
269: /* Get the name of the current working directory, and put it in SIZE bytes
270: of BUF.
271: Return BUF if successful, or NULL if the directory couldn't be determined
272: or SIZE was too small.
273: See the POSIX:2001 specification
274: <http://www.opengroup.org/susv3xsh/getcwd.html>.
275: Additionally, the gnulib module 'getcwd' guarantees the following GNU
276: extension: If BUF is NULL, an array is allocated with 'malloc'; the array
277: is SIZE bytes long, unless SIZE == 0, in which case it is as big as
278: necessary. */
279: # define getcwd rpl_getcwd
280: extern char * getcwd (char *buf, size_t size);
281: # endif
282: #elif defined GNULIB_POSIXCHECK
283: # undef getcwd
284: # define getcwd(b,s) \
285: (GL_LINK_WARNING ("getcwd is unportable - " \
286: "use gnulib module getcwd for portability"), \
287: getcwd (b, s))
288: #endif
289:
290:
291: #if @GNULIB_GETDOMAINNAME@
292: /* Return the NIS domain name of the machine.
293: WARNING! The NIS domain name is unrelated to the fully qualified host name
294: of the machine. It is also unrelated to email addresses.
295: WARNING! The NIS domain name is usually the empty string or "(none)" when
296: not using NIS.
297:
298: Put up to LEN bytes of the NIS domain name into NAME.
299: Null terminate it if the name is shorter than LEN.
300: If the NIS domain name is longer than LEN, set errno = EINVAL and return -1.
301: Return 0 if successful, otherwise set errno and return -1. */
302: # if !@HAVE_GETDOMAINNAME@
303: extern int getdomainname(char *name, size_t len);
304: # endif
305: #elif defined GNULIB_POSIXCHECK
306: # undef getdomainname
307: # define getdomainname(n,l) \
308: (GL_LINK_WARNING ("getdomainname is unportable - " \
309: "use gnulib module getdomainname for portability"), \
310: getdomainname (n, l))
311: #endif
312:
313:
314: #if @GNULIB_GETDTABLESIZE@
315: # if !@HAVE_GETDTABLESIZE@
316: /* Return the maximum number of file descriptors in the current process. */
317: extern int getdtablesize (void);
318: # endif
319: #elif defined GNULIB_POSIXCHECK
320: # undef getdtablesize
321: # define getdtablesize() \
322: (GL_LINK_WARNING ("getdtablesize is unportable - " \
323: "use gnulib module getdtablesize for portability"), \
324: getdtablesize ())
325: #endif
326:
327:
328: #if @GNULIB_GETHOSTNAME@
329: /* Return the standard host name of the machine.
330: WARNING! The host name may or may not be fully qualified.
331:
332: Put up to LEN bytes of the host name into NAME.
333: Null terminate it if the name is shorter than LEN.
334: If the host name is longer than LEN, set errno = EINVAL and return -1.
335: Return 0 if successful, otherwise set errno and return -1. */
336: # if @UNISTD_H_HAVE_WINSOCK2_H@
337: # undef gethostname
338: # define gethostname rpl_gethostname
339: # endif
340: # if @UNISTD_H_HAVE_WINSOCK2_H@ || !@HAVE_GETHOSTNAME@
341: extern int gethostname(char *name, size_t len);
342: # endif
343: #elif @UNISTD_H_HAVE_WINSOCK2_H@
344: # undef gethostname
345: # define gethostname gethostname_used_without_requesting_gnulib_module_gethostname
346: #elif defined GNULIB_POSIXCHECK
347: # undef gethostname
348: # define gethostname(n,l) \
349: (GL_LINK_WARNING ("gethostname is unportable - " \
350: "use gnulib module gethostname for portability"), \
351: gethostname (n, l))
352: #endif
353:
354:
355: #if @GNULIB_GETLOGIN_R@
356: /* Copies the user's login name to NAME.
357: The array pointed to by NAME has room for SIZE bytes.
358:
359: Returns 0 if successful. Upon error, an error number is returned, or -1 in
360: the case that the login name cannot be found but no specific error is
361: provided (this case is hopefully rare but is left open by the POSIX spec).
362:
363: See <http://www.opengroup.org/susv3xsh/getlogin.html>.
364: */
365: # if !@HAVE_DECL_GETLOGIN_R@
366: # include <stddef.h>
367: extern int getlogin_r (char *name, size_t size);
368: # endif
369: #elif defined GNULIB_POSIXCHECK
370: # undef getlogin_r
371: # define getlogin_r(n,s) \
372: (GL_LINK_WARNING ("getlogin_r is unportable - " \
373: "use gnulib module getlogin_r for portability"), \
374: getlogin_r (n, s))
375: #endif
376:
377:
378: #if @GNULIB_GETPAGESIZE@
379: # if @REPLACE_GETPAGESIZE@
380: # define getpagesize rpl_getpagesize
381: extern int getpagesize (void);
382: # elif !@HAVE_GETPAGESIZE@
383: /* This is for POSIX systems. */
384: # if !defined getpagesize && defined _SC_PAGESIZE
385: # if ! (defined __VMS && __VMS_VER < 70000000)
386: # define getpagesize() sysconf (_SC_PAGESIZE)
387: # endif
388: # endif
389: /* This is for older VMS. */
390: # if !defined getpagesize && defined __VMS
391: # ifdef __ALPHA
392: # define getpagesize() 8192
393: # else
394: # define getpagesize() 512
395: # endif
396: # endif
397: /* This is for BeOS. */
398: # if !defined getpagesize && @HAVE_OS_H@
399: # include <OS.h>
400: # if defined B_PAGE_SIZE
401: # define getpagesize() B_PAGE_SIZE
402: # endif
403: # endif
404: /* This is for AmigaOS4.0. */
405: # if !defined getpagesize && defined __amigaos4__
406: # define getpagesize() 2048
407: # endif
408: /* This is for older Unix systems. */
409: # if !defined getpagesize && @HAVE_SYS_PARAM_H@
410: # include <sys/param.h>
411: # ifdef EXEC_PAGESIZE
412: # define getpagesize() EXEC_PAGESIZE
413: # else
414: # ifdef NBPG
415: # ifndef CLSIZE
416: # define CLSIZE 1
417: # endif
418: # define getpagesize() (NBPG * CLSIZE)
419: # else
420: # ifdef NBPC
421: # define getpagesize() NBPC
422: # endif
423: # endif
424: # endif
425: # endif
426: # endif
427: #elif defined GNULIB_POSIXCHECK
428: # undef getpagesize
429: # define getpagesize() \
430: (GL_LINK_WARNING ("getpagesize is unportable - " \
431: "use gnulib module getpagesize for portability"), \
432: getpagesize ())
433: #endif
434:
435:
436: #if @GNULIB_GETUSERSHELL@
437: # if !@HAVE_GETUSERSHELL@
438: /* Return the next valid login shell on the system, or NULL when the end of
439: the list has been reached. */
440: extern char *getusershell (void);
441: /* Rewind to pointer that is advanced at each getusershell() call. */
442: extern void setusershell (void);
443: /* Free the pointer that is advanced at each getusershell() call and
444: associated resources. */
445: extern void endusershell (void);
446: # endif
447: #elif defined GNULIB_POSIXCHECK
448: # undef getusershell
449: # define getusershell() \
450: (GL_LINK_WARNING ("getusershell is unportable - " \
451: "use gnulib module getusershell for portability"), \
452: getusershell ())
453: # undef setusershell
454: # define setusershell() \
455: (GL_LINK_WARNING ("setusershell is unportable - " \
456: "use gnulib module getusershell for portability"), \
457: setusershell ())
458: # undef endusershell
459: # define endusershell() \
460: (GL_LINK_WARNING ("endusershell is unportable - " \
461: "use gnulib module getusershell for portability"), \
462: endusershell ())
463: #endif
464:
465:
466: #if @GNULIB_LCHOWN@
467: # if @REPLACE_LCHOWN@
468: /* Change the owner of FILE to UID (if UID is not -1) and the group of FILE
469: to GID (if GID is not -1). Do not follow symbolic links.
470: Return 0 if successful, otherwise -1 and errno set.
471: See the POSIX:2001 specification
472: <http://www.opengroup.org/susv3xsh/lchown.html>. */
473: # define lchown rpl_lchown
474: extern int lchown (char const *file, uid_t owner, gid_t group);
475: # endif
476: #elif defined GNULIB_POSIXCHECK
477: # undef lchown
478: # define lchown(f,u,g) \
479: (GL_LINK_WARNING ("lchown is unportable to pre-POSIX.1-2001 " \
480: "systems - use gnulib module lchown for portability"), \
481: lchown (f, u, g))
482: #endif
483:
484:
485: #if @GNULIB_LINK@
486: /* Create a new hard link for an existing file.
487: Return 0 if successful, otherwise -1 and errno set.
488: See POSIX:2001 specification
489: <http://www.opengroup.org/susv3xsh/link.html>. */
490: # if !@HAVE_LINK@
491: extern int link (const char *path1, const char *path2);
492: # endif
493: #elif defined GNULIB_POSIXCHECK
494: # undef link
495: # define link(path1,path2) \
496: (GL_LINK_WARNING ("link is unportable - " \
497: "use gnulib module link for portability"), \
498: link (path1, path2))
499: #endif
500:
501:
502: #if @GNULIB_LSEEK@
503: # if @REPLACE_LSEEK@
504: /* Set the offset of FD relative to SEEK_SET, SEEK_CUR, or SEEK_END.
505: Return the new offset if successful, otherwise -1 and errno set.
506: See the POSIX:2001 specification
507: <http://www.opengroup.org/susv3xsh/lseek.html>. */
508: # define lseek rpl_lseek
509: extern off_t lseek (int fd, off_t offset, int whence);
510: # endif
511: #elif defined GNULIB_POSIXCHECK
512: # undef lseek
513: # define lseek(f,o,w) \
514: (GL_LINK_WARNING ("lseek does not fail with ESPIPE on pipes on some " \
515: "systems - use gnulib module lseek for portability"), \
516: lseek (f, o, w))
517: #endif
518:
519:
520: #if @GNULIB_READLINK@
521: /* Read the contents of the symbolic link FILE and place the first BUFSIZE
522: bytes of it into BUF. Return the number of bytes placed into BUF if
523: successful, otherwise -1 and errno set.
524: See the POSIX:2001 specification
525: <http://www.opengroup.org/susv3xsh/readlink.html>. */
526: # if !@HAVE_READLINK@
527: # include <stddef.h>
528: extern int readlink (const char *file, char *buf, size_t bufsize);
529: # endif
530: #elif defined GNULIB_POSIXCHECK
531: # undef readlink
532: # define readlink(f,b,s) \
533: (GL_LINK_WARNING ("readlink is unportable - " \
534: "use gnulib module readlink for portability"), \
535: readlink (f, b, s))
536: #endif
537:
538:
539: #if @GNULIB_SLEEP@
540: /* Pause the execution of the current thread for N seconds.
541: Returns the number of seconds left to sleep.
542: See the POSIX:2001 specification
543: <http://www.opengroup.org/susv3xsh/sleep.html>. */
544: # if !@HAVE_SLEEP@
545: extern unsigned int sleep (unsigned int n);
546: # endif
547: #elif defined GNULIB_POSIXCHECK
548: # undef sleep
549: # define sleep(n) \
550: (GL_LINK_WARNING ("sleep is unportable - " \
551: "use gnulib module sleep for portability"), \
552: sleep (n))
553: #endif
554:
555:
556: #if @GNULIB_WRITE@ && @REPLACE_WRITE@ && @GNULIB_UNISTD_H_SIGPIPE@
557: /* Write up to COUNT bytes starting at BUF to file descriptor FD.
558: See the POSIX:2001 specification
559: <http://www.opengroup.org/susv3xsh/write.html>. */
560: # undef write
561: # define write rpl_write
562: extern ssize_t write (int fd, const void *buf, size_t count);
563: #endif
564:
565:
566: #ifdef FCHDIR_REPLACEMENT
567: /* gnulib internal function. */
568: extern void _gl_unregister_fd (int fd);
569: #endif
570:
571:
572: #ifdef __cplusplus
573: }
574: #endif
575:
576:
577: #endif /* _GL_UNISTD_H */
578: #endif /* _GL_UNISTD_H */
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