1 /* $RCSfile: doio.c,v $$Revision: 4.1 $$Date: 92/08/07 17:19:42 $
3 * Copyright (c) 1991, Larry Wall
5 * You may distribute under the terms of either the GNU General Public
6 * License or the Artistic License, as specified in the README file.
9 * Revision 4.1 92/08/07 17:19:42 lwall
12 * Revision 4.0.1.6 92/06/11 21:08:16 lwall
13 * patch34: some systems don't declare h_errno extern in header files
15 * Revision 4.0.1.5 92/06/08 13:00:21 lwall
16 * patch20: some machines don't define ENOTSOCK in errno.h
17 * patch20: new warnings for failed use of stat operators on filenames with \n
18 * patch20: wait failed when STDOUT or STDERR reopened to a pipe
19 * patch20: end of file latch not reset on reopen of STDIN
20 * patch20: seek(HANDLE, 0, 1) went to eof because of ancient Ultrix workaround
21 * patch20: fixed memory leak on system() for vfork() machines
22 * patch20: get*by* routines now return something useful in a scalar context
23 * patch20: h_errno now accessible via $?
25 * Revision 4.0.1.4 91/11/05 16:51:43 lwall
26 * patch11: prepared for ctype implementations that don't define isascii()
27 * patch11: perl mistook some streams for sockets because they return mode 0 too
28 * patch11: reopening STDIN, STDOUT and STDERR failed on some machines
29 * patch11: certain perl errors should set EBADF so that $! looks better
30 * patch11: truncate on a closed filehandle could dump
31 * patch11: stats of _ forgot whether prior stat was actually lstat
32 * patch11: -T returned true on NFS directory
34 * Revision 4.0.1.3 91/06/10 01:21:19 lwall
35 * patch10: read didn't work from character special files open for writing
36 * patch10: close-on-exec wrongly set on system file descriptors
38 * Revision 4.0.1.2 91/06/07 10:53:39 lwall
39 * patch4: new copyright notice
40 * patch4: system fd's are now treated specially
41 * patch4: added $^F variable to specify maximum system fd, default 2
42 * patch4: character special files now opened with bidirectional stdio buffers
43 * patch4: taintchecks could improperly modify parent in vfork()
44 * patch4: many, many itty-bitty portability fixes
46 * Revision 4.0.1.1 91/04/11 17:41:06 lwall
47 * patch1: hopefully straightened out some of the Xenix mess
49 * Revision 4.0 91/03/20 01:07:06 lwall
57 #if defined(HAS_MSG) || defined(HAS_SEM) || defined(HAS_SHM)
87 register IO *io = GvIO(gv);
88 char *myname = savestr(name);
92 char mode[3]; /* stdio file mode ("r\0" or "r+\0") */
93 FILE *saveifp = Nullfp;
94 FILE *saveofp = Nullfp;
98 mode[0] = mode[1] = mode[2] = '\0';
100 forkprocess = 1; /* assume true if no fork */
101 while (len && isSPACE(name[len-1]))
104 io = GvIO(gv) = newIO();
105 else if (IoIFP(io)) {
106 fd = fileno(IoIFP(io));
107 if (IoTYPE(io) == '-')
109 else if (fd <= maxsysfd) {
112 savetype = IoTYPE(io);
115 else if (IoTYPE(io) == '|')
116 result = my_pclose(IoIFP(io));
117 else if (IoIFP(io) != IoOFP(io)) {
119 result = fclose(IoOFP(io));
120 fclose(IoIFP(io)); /* clear stdio, fd already closed */
123 result = fclose(IoIFP(io));
126 result = fclose(IoIFP(io));
127 if (result == EOF && fd > maxsysfd)
128 fprintf(stderr,"Warning: unable to close filehandle %s properly.\n",
130 IoOFP(io) = IoIFP(io) = Nullfp;
132 if (*name == '+' && len > 1 && name[len-1] != '|') { /* scary */
144 for (name++; isSPACE(*name); name++) ;
147 TAINT_PROPER("piped open");
148 fp = my_popen(name,"w");
151 else if (*name == '>') {
152 TAINT_PROPER("open");
155 mode[0] = IoTYPE(io) = 'a';
164 while (isSPACE(*name))
169 gv = gv_fetchpv(name,FALSE,SVt_PVIO);
170 if (!gv || !GvIO(gv)) {
176 if (GvIO(gv) && IoIFP(GvIO(gv))) {
177 fd = fileno(IoIFP(GvIO(gv)));
178 if (IoTYPE(GvIO(gv)) == 's')
184 if (!(fp = fdopen(fd = dup(fd),mode))) {
189 while (isSPACE(*name))
191 if (strEQ(name,"-")) {
196 fp = fopen(name,mode);
204 while (isSPACE(*name))
208 if (strEQ(name,"-")) {
213 fp = fopen(name,mode);
215 else if (name[len-1] == '|') {
217 while (len && isSPACE(name[len-1]))
220 for (; isSPACE(*name); name++) ;
223 TAINT_PROPER("piped open");
224 fp = my_popen(name,"r");
230 for (; isSPACE(*name); name++) ;
231 if (strEQ(name,"-")) {
236 fp = fopen(name,"r");
240 if (dowarn && IoTYPE(io) == '<' && strchr(name, '\n'))
241 warn(warn_nl, "open");
245 IoTYPE(io) != '|' && IoTYPE(io) != '-') {
246 if (fstat(fileno(fp),&statbuf) < 0) {
250 if (S_ISSOCK(statbuf.st_mode))
251 IoTYPE(io) = 's'; /* in case a socket was passed in to us */
255 !(statbuf.st_mode & S_IFMT)
260 I32 buflen = sizeof tokenbuf;
261 if (getsockname(fileno(fp), tokenbuf, &buflen) >= 0
262 || errno != ENOTSOCK)
263 IoTYPE(io) = 's'; /* some OS's return 0 on fstat()ed socket */
264 /* but some return 0 for streams too, sigh */
268 if (saveifp) { /* must use old fp? */
269 fd = fileno(saveifp);
271 fflush(saveofp); /* emulate fclose() */
272 if (saveofp != saveifp) { /* was a socket? */
278 if (fd != fileno(fp)) {
282 dup2(fileno(fp), fd);
283 sv = *av_fetch(fdpid,fileno(fp),TRUE);
284 SvUPGRADE(sv, SVt_IV);
287 sv = *av_fetch(fdpid,fd,TRUE);
288 SvUPGRADE(sv, SVt_IV);
296 #if defined(HAS_FCNTL) && defined(FFt_SETFD)
298 fcntl(fd,FFt_SETFD,fd > maxsysfd);
302 if (IoTYPE(io) == 's'
303 || (IoTYPE(io) == '>' && S_ISCHR(statbuf.st_mode)) ) {
304 if (!(IoOFP(io) = fdopen(fileno(fp),"w"))) {
318 IoTYPE(io) = savetype;
327 #ifndef FLEXFILENAMES
335 argvoutgv = gv_fetchpv("ARGVOUT",TRUE,SVt_PVIO);
336 if (filemode & (S_ISUID|S_ISGID)) {
337 fflush(IoIFP(GvIO(argvoutgv))); /* chmod must follow last write */
339 (void)fchmod(lastfd,filemode);
341 (void)chmod(oldname,filemode);
345 while (av_len(GvAV(gv)) >= 0) {
347 sv = av_shift(GvAV(gv));
349 sv_setsv(GvSV(gv),sv);
350 SvSETMAGIC(GvSV(gv));
351 oldname = SvPVx(GvSV(gv), len);
352 if (do_open(gv,oldname,len)) {
354 TAINT_PROPER("inplace open");
355 if (strEQ(oldname,"-")) {
356 defoutgv = gv_fetchpv("STDOUT",TRUE,SVt_PVIO);
357 return IoIFP(GvIO(gv));
359 #ifndef FLEXFILENAMES
360 filedev = statbuf.st_dev;
361 fileino = statbuf.st_ino;
363 filemode = statbuf.st_mode;
364 fileuid = statbuf.st_uid;
365 filegid = statbuf.st_gid;
366 if (!S_ISREG(filemode)) {
367 warn("Can't do inplace edit: %s is not a regular file",
374 add_suffix(sv,inplace);
376 sv_catpv(sv,inplace);
378 #ifndef FLEXFILENAMES
379 if (stat(SvPVX(sv),&statbuf) >= 0
380 && statbuf.st_dev == filedev
381 && statbuf.st_ino == fileino ) {
382 warn("Can't do inplace edit: %s > 14 characters",
390 if (rename(oldname,SvPVX(sv)) < 0) {
391 warn("Can't rename %s to %s: %s, skipping file",
392 oldname, SvPVX(sv), Strerror(errno) );
398 (void)unlink(SvPVX(sv));
399 (void)rename(oldname,SvPVX(sv));
400 do_open(gv,SvPVX(sv),SvCUR(GvSV(gv)));
403 (void)UNLINK(SvPVX(sv));
404 if (link(oldname,SvPVX(sv)) < 0) {
405 warn("Can't rename %s to %s: %s, skipping file",
406 oldname, SvPVX(sv), Strerror(errno) );
410 (void)UNLINK(oldname);
415 if (UNLINK(oldname) < 0) {
416 warn("Can't rename %s to %s: %s, skipping file",
417 oldname, SvPVX(sv), Strerror(errno) );
422 croak("Can't do inplace edit without backup");
427 sv_catpv(sv,oldname);
428 errno = 0; /* in case sprintf set errno */
429 if (!do_open(argvoutgv,SvPVX(sv),SvCUR(sv))) {
430 warn("Can't do inplace edit on %s: %s",
431 oldname, Strerror(errno) );
435 defoutgv = argvoutgv;
436 lastfd = fileno(IoIFP(GvIO(argvoutgv)));
437 (void)fstat(lastfd,&statbuf);
439 (void)fchmod(lastfd,filemode);
441 (void)chmod(oldname,filemode);
443 if (fileuid != statbuf.st_uid || filegid != statbuf.st_gid) {
445 (void)fchown(lastfd,fileuid,filegid);
448 (void)chown(oldname,fileuid,filegid);
453 return IoIFP(GvIO(gv));
456 fprintf(stderr,"Can't open %s: %s\n",SvPV(sv, na), Strerror(errno));
459 (void)do_close(argvoutgv,FALSE);
460 defoutgv = gv_fetchpv("STDOUT",TRUE,SVt_PVIO);
467 do_pipe(sv, rgv, wgv)
485 rstio = GvIO(rgv) = newIO();
486 else if (IoIFP(rstio))
489 wstio = GvIO(wgv) = newIO();
490 else if (IoIFP(wstio))
495 IoIFP(rstio) = fdopen(fd[0], "r");
496 IoOFP(wstio) = fdopen(fd[1], "w");
497 IoIFP(wstio) = IoOFP(wstio);
500 if (!IoIFP(rstio) || !IoOFP(wstio)) {
501 if (IoIFP(rstio)) fclose(IoIFP(rstio));
503 if (IoOFP(wstio)) fclose(IoOFP(wstio));
508 sv_setsv(sv,&sv_yes);
512 sv_setsv(sv,&sv_undef);
519 do_close(gv,explicit)
523 do_close(GV *gv, bool explicit)
524 #endif /* STANDARD_C */
537 if (!io) { /* never opened */
538 if (dowarn && explicit)
539 warn("Close on unopened file <%s>",GvENAME(gv));
543 if (IoTYPE(io) == '|') {
544 status = my_pclose(IoIFP(io));
545 retval = (status == 0);
546 statusvalue = (unsigned short)status & 0xffff;
548 else if (IoTYPE(io) == '-')
551 if (IoOFP(io) && IoOFP(io) != IoIFP(io)) { /* a socket */
552 retval = (fclose(IoOFP(io)) != EOF);
553 fclose(IoIFP(io)); /* clear stdio, fd already closed */
556 retval = (fclose(IoIFP(io)) != EOF);
558 IoOFP(io) = IoIFP(io) = Nullfp;
563 IoLINES_LEFT(io) = IoPAGE_LEN(io);
583 #ifdef USE_STD_STDIO /* (the code works without this) */
584 if (IoIFP(io)->_cnt > 0) /* cheat a little, since */
585 return FALSE; /* this is the most usual case */
588 ch = getc(IoIFP(io));
590 (void)ungetc(ch, IoIFP(io));
594 if (IoIFP(io)->_cnt < -1)
595 IoIFP(io)->_cnt = -1;
597 if (op->op_flags & OPf_SPECIAL) { /* not necessarily a real EOF yet? */
598 if (!nextargv(argvgv)) /* get another fp handy */
602 return TRUE; /* normal fp, definitely end of file */
617 if (!io || !IoIFP(io))
620 #ifdef ULTRIX_STDIO_BOTCH
622 (void)fseek (IoIFP(io), 0L, 2); /* ultrix 1.2 workaround */
625 return ftell(IoIFP(io));
629 warn("tell() on unopened file");
635 do_seek(gv, pos, whence)
646 if (!io || !IoIFP(io))
649 #ifdef ULTRIX_STDIO_BOTCH
651 (void)fseek (IoIFP(io), 0L, 2); /* ultrix 1.2 workaround */
654 return fseek(IoIFP(io), pos, whence) >= 0;
658 warn("seek() on unopened file");
664 do_ctl(optype,gv,func,argstr)
674 if (!gv || !argstr || !(io = GvIO(gv)) || !IoIFP(io)) {
675 errno = EBADF; /* well, sort of... */
679 if (SvPOK(argstr) || !SvNIOK(argstr)) {
681 s = SvPV(argstr, na);
685 #define IOCPARM_LEN(x) (((x) >> 16) & IOCPARM_MASK)
689 retval = IOCPARM_LEN(func); /* on BSDish systes we're safe */
691 retval = 256; /* otherwise guess at what's safe */
693 if (SvCUR(argstr) < retval) {
694 Sv_Grow(argstr,retval+1);
695 SvCUR_set(argstr, retval);
699 s[SvCUR(argstr)] = 17; /* a little sanity check here */
702 retval = SvIV(argstr);
704 s = (char*)(long)retval; /* ouch */
706 s = (char*)retval; /* ouch */
711 if (optype == OP_IOCTL)
712 retval = ioctl(fileno(IoIFP(io)), func, s);
715 croak("fcntl is not implemented");
718 retval = fcntl(fileno(IoIFP(io)), func, s);
720 croak("fcntl is not implemented");
728 if (s[SvCUR(argstr)] != 17)
729 croak("Return value overflowed string");
730 s[SvCUR(argstr)] = 0; /* put our null back */
735 #if !defined(HAS_TRUNCATE) && !defined(HAS_CHSIZE) && defined(FFt_FREESP)
736 /* code courtesy of William Kucharski */
739 I32 chsize(fd, length)
740 I32 fd; /* file descriptor */
741 Off_t length; /* length to set file to */
747 if (fstat(fd, &filebuf) < 0)
750 if (filebuf.st_size < length) {
752 /* extend file length */
754 if ((lseek(fd, (length - 1), 0)) < 0)
757 /* write a "0" byte */
759 if ((write(fd, "", 1)) != 1)
763 /* truncate length */
768 fl.l_type = FFt_WRLCK; /* write lock on file space */
771 * This relies on the UNDOCUMENTED FFt_FREESP argument to
772 * fcntl(2), which truncates the file so that it ends at the
773 * position indicated by fl.l_start.
775 * Will minor miracles never cease?
778 if (fcntl(fd, FFt_FREESP, &fl) < 0)
785 #endif /* FFt_FREESP */
788 looks_like_number(sv)
803 send = s + SvCUR(sv);
809 if (*s == '+' || *s == '-')
817 else if (s == SvPVX(sv))
823 if (*s == 'e' || *s == 'E') {
825 if (*s == '+' || *s == '-')
846 /* assuming fp is checked earlier */
852 if (SvIOK(sv) && SvIVX(sv) != 0) {
853 fprintf(fp, ofmt, (double)SvIVX(sv));
856 if ( (SvNOK(sv) && SvNVX(sv) != 0.0)
857 || (looks_like_number(sv) && sv_2nv(sv) != 0.0) ) {
858 fprintf(fp, ofmt, SvNVX(sv));
862 switch (SvTYPE(sv)) {
870 fprintf(fp, "%d", SvIVX(sv));
873 tmps = SvPV(sv, len);
876 if (len && (fwrite(tmps,1,len,fp) == 0 || ferror(fp)))
888 if (op->op_flags & OPf_SPECIAL) {
890 io = GvIO(cGVOP->op_gv);
891 if (io && IoIFP(io)) {
892 statgv = cGVOP->op_gv;
893 sv_setpv(statname,"");
895 return (laststatval = fstat(fileno(IoIFP(io)), &statcache));
898 if (cGVOP->op_gv == defgv)
901 warn("Stat on unopened file <%s>",
902 GvENAME(cGVOP->op_gv));
904 sv_setpv(statname,"");
905 return (laststatval = -1);
912 sv_setpv(statname,SvPV(sv, na));
914 laststatval = stat(SvPV(sv, na),&statcache);
915 if (laststatval < 0 && dowarn && strchr(SvPV(sv, na), '\n'))
916 warn(warn_nl, "stat");
927 if (op->op_flags & OPf_SPECIAL) {
929 if (cGVOP->op_gv == defgv) {
930 if (laststype != OP_LSTAT)
931 croak("The stat preceding -l _ wasn't an lstat");
934 croak("You can't use -l on a filehandle");
937 laststype = OP_LSTAT;
941 sv_setpv(statname,SvPV(sv, na));
943 laststatval = lstat(SvPV(sv, na),&statcache);
945 laststatval = stat(SvPV(sv, na),&statcache);
947 if (laststatval < 0 && dowarn && strchr(SvPV(sv, na), '\n'))
948 warn(warn_nl, "lstat");
953 do_aexec(really,mark,sp)
962 New(401,Argv, sp - mark + 1, char*);
964 while (++mark <= sp) {
966 *a++ = SvPVx(*mark, na);
971 if (*Argv[0] != '/') /* will execvp use PATH? */
972 TAINT_ENV(); /* testing IFS here is overkill, probably */
973 if (really && *(tmps = SvPV(really, na)))
976 execvp(Argv[0],Argv);
987 Argv = Null(char **);
1003 /* save an extra exec if possible */
1006 if (strnEQ(cmd,cshname,cshlen) && strnEQ(cmd+cshlen," -c",3)) {
1022 if (s[-1] == '\'') {
1024 execl(cshname,"csh", flags,ncmd,(char*)0);
1032 /* see if there are shell metacharacters in it */
1035 for (s = cmd; *s && isALPHA(*s); s++) ; /* catch VAR=val gizmo */
1038 for (s = cmd; *s; s++) {
1039 if (*s != ' ' && !isALPHA(*s) && strchr("$&*(){}[]'\";\\|?<>~`\n",*s)) {
1040 if (*s == '\n' && !s[1]) {
1045 execl("/bin/sh","sh","-c",cmd,(char*)0);
1049 New(402,Argv, (s - cmd) / 2 + 2, char*);
1050 Cmd = nsavestr(cmd, s-cmd);
1052 for (s = Cmd; *s;) {
1053 while (*s && isSPACE(*s)) s++;
1056 while (*s && !isSPACE(*s)) s++;
1062 execvp(Argv[0],Argv);
1063 if (errno == ENOEXEC) { /* for system V NIH syndrome */
1080 register I32 tot = 0;
1082 SV **oldmark = mark;
1085 while (++mark <= sp) {
1086 if (SvMAGICAL(*mark) && mg_find(*mark, 't'))
1093 TAINT_PROPER("chmod");
1097 while (++mark <= sp) {
1098 if (chmod(SvPVx(*mark, na),val))
1105 TAINT_PROPER("chown");
1106 if (sp - mark > 2) {
1108 val = SvIVx(*++mark);
1109 val2 = SvIVx(*++mark);
1110 while (++mark <= sp) {
1111 if (chown(SvPVx(*mark, na),val,val2))
1119 TAINT_PROPER("kill");
1120 s = SvPVx(*++mark, na);
1123 if (*s == 'S' && s[1] == 'I' && s[2] == 'G')
1125 if (!(val = whichsig(s)))
1126 croak("Unrecognized signal name \"%s\"",s);
1132 while (++mark <= sp) {
1133 I32 proc = SvIVx(*mark);
1135 if (killpg(proc,val)) /* BSD */
1137 if (kill(-proc,val)) /* SYSV */
1143 while (++mark <= sp) {
1144 if (kill(SvIVx(*mark),val))
1151 TAINT_PROPER("unlink");
1153 while (++mark <= sp) {
1154 s = SvPVx(*mark, na);
1155 if (euid || unsafe) {
1159 else { /* don't let root wipe out directories without -U */
1161 if (lstat(s,&statbuf) < 0 || S_ISDIR(statbuf.st_mode))
1163 if (stat(s,&statbuf) < 0 || S_ISDIR(statbuf.st_mode))
1174 TAINT_PROPER("utime");
1175 if (sp - mark > 2) {
1177 struct utimbuf utbuf;
1185 Zero(&utbuf, sizeof utbuf, char);
1186 utbuf.actime = SvIVx(*++mark); /* time accessed */
1187 utbuf.modtime = SvIVx(*++mark); /* time modified */
1189 while (++mark <= sp) {
1190 if (utime(SvPVx(*mark, na),&utbuf))
1201 /* Do the permissions allow some operation? Assumes statcache already set. */
1204 cando(bit, effective, statbufp)
1207 register struct stat *statbufp;
1210 /* [Comments and code from Len Reed]
1211 * MS-DOS "user" is similar to UNIX's "superuser," but can't write
1212 * to write-protected files. The execute permission bit is set
1213 * by the Miscrosoft C library stat() function for the following:
1218 * All files and directories are readable.
1219 * Directories and special files, e.g. "CON", cannot be
1221 * [Comment by Tom Dinger -- a directory can have the write-protect
1222 * bit set in the file system, but DOS permits changes to
1223 * the directory anyway. In addition, all bets are off
1224 * here for networked software, such as Novell and
1228 /* Atari stat() does pretty much the same thing. we set x_bit_set_in_stat
1229 * too so it will actually look into the files for magic numbers
1231 return (bit & statbufp->st_mode) ? TRUE : FALSE;
1234 if ((effective ? euid : uid) == 0) { /* root is special */
1235 if (bit == S_IXUSR) {
1236 if (statbufp->st_mode & 0111 || S_ISDIR(statbufp->st_mode))
1240 return TRUE; /* root reads and writes anything */
1243 if (statbufp->st_uid == (effective ? euid : uid) ) {
1244 if (statbufp->st_mode & bit)
1245 return TRUE; /* ok as "user" */
1247 else if (ingroup((I32)statbufp->st_gid,effective)) {
1248 if (statbufp->st_mode & bit >> 3)
1249 return TRUE; /* ok as "group" */
1251 else if (statbufp->st_mode & bit >> 6)
1252 return TRUE; /* ok as "other" */
1254 #endif /* ! MSDOS */
1258 ingroup(testgid,effective)
1262 if (testgid == (effective ? egid : gid))
1264 #ifdef HAS_GETGROUPS
1269 GROUPSTYPE gary[NGROUPS];
1272 anum = getgroups(NGROUPS,gary);
1274 if (gary[anum] == testgid)
1281 #if defined(HAS_MSG) || defined(HAS_SEM) || defined(HAS_SHM)
1284 do_ipcget(optype, mark, sp)
1292 key = (key_t)SvNVx(*++mark);
1293 n = (optype == OP_MSGGET) ? 0 : SvIVx(*++mark);
1294 flags = SvIVx(*++mark);
1300 return msgget(key, flags);
1304 return semget(key, n, flags);
1308 return shmget(key, n, flags);
1310 #if !defined(HAS_MSG) || !defined(HAS_SEM) || !defined(HAS_SHM)
1312 croak("%s not implemented", op_name[optype]);
1315 return -1; /* should never happen */
1319 do_ipcctl(optype, mark, sp)
1326 I32 id, n, cmd, infosize, getinfo, ret;
1328 id = SvIVx(*++mark);
1329 n = (optype == OP_SEMCTL) ? SvIVx(*++mark) : 0;
1330 cmd = SvIVx(*++mark);
1333 getinfo = (cmd == IPC_STAT);
1339 if (cmd == IPC_STAT || cmd == IPC_SET)
1340 infosize = sizeof(struct msqid_ds);
1345 if (cmd == IPC_STAT || cmd == IPC_SET)
1346 infosize = sizeof(struct shmid_ds);
1351 if (cmd == IPC_STAT || cmd == IPC_SET)
1352 infosize = sizeof(struct semid_ds);
1353 else if (cmd == GETALL || cmd == SETALL)
1355 struct semid_ds semds;
1356 if (semctl(id, 0, IPC_STAT, &semds) == -1)
1358 getinfo = (cmd == GETALL);
1359 infosize = semds.sem_nsems * sizeof(short);
1360 /* "short" is technically wrong but much more portable
1361 than guessing about u_?short(_t)? */
1365 #if !defined(HAS_MSG) || !defined(HAS_SEM) || !defined(HAS_SHM)
1367 croak("%s not implemented", op_name[optype]);
1375 if (SvTHINKFIRST(astr)) {
1376 if (SvREADONLY(astr))
1377 croak("Can't %s to readonly var", op_name[optype]);
1381 SvGROW(astr, infosize+1);
1387 a = SvPV(astr, len);
1388 if (len != infosize)
1389 croak("Bad arg length for %s, is %d, should be %d",
1390 op_name[optype], len, infosize);
1396 a = (char *)i; /* ouch */
1403 ret = msgctl(id, cmd, (struct msqid_ds *)a);
1408 ret = semctl(id, n, cmd, (struct semid_ds *)a);
1413 ret = shmctl(id, cmd, (struct shmid_ds *)a);
1417 if (getinfo && ret >= 0) {
1418 SvCUR_set(astr, infosize);
1419 *SvEND(astr) = '\0';
1432 I32 id, msize, flags;
1435 id = SvIVx(*++mark);
1437 flags = SvIVx(*++mark);
1438 mbuf = SvPV(mstr, len);
1439 if ((msize = len - sizeof(long)) < 0)
1440 croak("Arg too short for msgsnd");
1442 return msgsnd(id, (struct msgbuf *)mbuf, msize, flags);
1444 croak("msgsnd not implemented");
1457 I32 id, msize, flags, ret;
1460 id = SvIVx(*++mark);
1462 msize = SvIVx(*++mark);
1463 mtype = (long)SvIVx(*++mark);
1464 flags = SvIVx(*++mark);
1465 if (SvTHINKFIRST(mstr)) {
1466 if (SvREADONLY(mstr))
1467 croak("Can't msgrcv to readonly var");
1471 mbuf = SvPV(mstr, len);
1472 if (len < sizeof(long)+msize+1) {
1473 SvGROW(mstr, sizeof(long)+msize+1);
1474 mbuf = SvPV(mstr, len);
1477 ret = msgrcv(id, (struct msgbuf *)mbuf, msize, mtype, flags);
1479 SvCUR_set(mstr, sizeof(long)+ret);
1480 *SvEND(mstr) = '\0';
1484 croak("msgrcv not implemented");
1499 id = SvIVx(*++mark);
1501 opbuf = SvPV(opstr, opsize);
1502 if (opsize < sizeof(struct sembuf)
1503 || (opsize % sizeof(struct sembuf)) != 0) {
1508 return semop(id, (struct sembuf *)opbuf, opsize/sizeof(struct sembuf));
1510 croak("semop not implemented");
1515 do_shmio(optype, mark, sp)
1523 I32 id, mpos, msize;
1525 struct shmid_ds shmds;
1527 extern char *shmat P((int, char *, int));
1530 id = SvIVx(*++mark);
1532 mpos = SvIVx(*++mark);
1533 msize = SvIVx(*++mark);
1535 if (shmctl(id, IPC_STAT, &shmds) == -1)
1537 if (mpos < 0 || msize < 0 || mpos + msize > shmds.shm_segsz) {
1538 errno = EFAULT; /* can't do as caller requested */
1541 shm = (char*)shmat(id, (char*)NULL, (optype == OP_SHMREAD) ? SHM_RDONLY : 0);
1542 if (shm == (char *)-1) /* I hate System V IPC, I really do */
1544 mbuf = SvPV(mstr, len);
1545 if (optype == OP_SHMREAD) {
1546 if (SvTHINKFIRST(mstr)) {
1547 if (SvREADONLY(mstr))
1548 croak("Can't shmread to readonly var");
1553 SvGROW(mstr, msize+1);
1554 mbuf = SvPV(mstr, len);
1556 Copy(shm + mpos, mbuf, msize, char);
1557 SvCUR_set(mstr, msize);
1558 *SvEND(mstr) = '\0';
1563 if ((n = len) > msize)
1565 Copy(mbuf, shm + mpos, n, char);
1567 memzero(shm + mpos + n, msize - n);
1571 croak("shm I/O not implemented");
1575 #endif /* SYSV IPC */