3 * Copyright (c) 1991-1994, 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.
11 * "Far below them they saw the white waters pour into a foaming bowl, and
12 * then swirl darkly about a deep oval basin in the rocks, until they found
13 * their way out again through a narrow gate, and flowed away, fuming and
14 * chattering, into calmer and more level reaches."
20 #if defined(HAS_MSG) || defined(HAS_SEM) || defined(HAS_SHM)
30 # ifndef HAS_SHMAT_PROTOTYPE
31 extern Shmat_t shmat _((int, char *, int));
47 do_open(gv,name,len,supplied_fp)
54 register IO *io = GvIOn(gv);
55 char *myname = savepv(name);
60 char mode[3]; /* stdio file mode ("r\0" or "r+\0") */
61 FILE *saveifp = Nullfp;
62 FILE *saveofp = Nullfp;
66 mode[0] = mode[1] = mode[2] = '\0';
68 forkprocess = 1; /* assume true if no fork */
69 while (len && isSPACE(name[len-1]))
72 fd = fileno(IoIFP(io));
73 if (IoTYPE(io) == '-')
75 else if (fd <= maxsysfd) {
78 savetype = IoTYPE(io);
81 else if (IoTYPE(io) == '|')
82 result = my_pclose(IoIFP(io));
83 else if (IoIFP(io) != IoOFP(io)) {
85 result = fclose(IoOFP(io));
86 fclose(IoIFP(io)); /* clear stdio, fd already closed */
89 result = fclose(IoIFP(io));
92 result = fclose(IoIFP(io));
93 if (result == EOF && fd > maxsysfd)
94 fprintf(stderr,"Warning: unable to close filehandle %s properly.\n",
96 IoOFP(io) = IoIFP(io) = Nullfp;
98 if (*name == '+' && len > 1 && name[len-1] != '|') { /* scary */
110 for (name++; isSPACE(*name); name++) ;
113 TAINT_PROPER("piped open");
114 if (dowarn && name[strlen(name)-1] == '|')
115 warn("Can't do bidirectional pipe");
116 fp = my_popen(name,"w");
119 else if (*name == '>') {
120 TAINT_PROPER("open");
123 mode[0] = IoTYPE(io) = 'a';
137 if (!*name && supplied_fp)
140 while (isSPACE(*name))
146 gv = gv_fetchpv(name,FALSE,SVt_PVIO);
150 SETERRNO(EINVAL,SS$_IVCHAN);
155 fd = fileno(IoIFP(thatio));
156 if (IoTYPE(thatio) == 's')
164 if (!(fp = fdopen(fd,mode)))
170 while (isSPACE(*name))
172 if (strEQ(name,"-")) {
177 fp = fopen(name,mode);
185 while (isSPACE(*name))
189 if (strEQ(name,"-")) {
194 fp = fopen(name,mode);
196 else if (name[len-1] == '|') {
198 while (len && isSPACE(name[len-1]))
201 for (; isSPACE(*name); name++) ;
204 TAINT_PROPER("piped open");
205 fp = my_popen(name,"r");
211 for (; isSPACE(*name); name++) ;
212 if (strEQ(name,"-")) {
217 fp = fopen(name,"r");
221 if (dowarn && IoTYPE(io) == '<' && strchr(name, '\n'))
222 warn(warn_nl, "open");
226 IoTYPE(io) != '|' && IoTYPE(io) != '-') {
227 if (Fstat(fileno(fp),&statbuf) < 0) {
231 if (S_ISSOCK(statbuf.st_mode))
232 IoTYPE(io) = 's'; /* in case a socket was passed in to us */
236 !(statbuf.st_mode & S_IFMT)
241 int buflen = sizeof tokenbuf;
242 if (getsockname(fileno(fp), (struct sockaddr *)tokenbuf, &buflen) >= 0
243 || errno != ENOTSOCK)
244 IoTYPE(io) = 's'; /* some OS's return 0 on fstat()ed socket */
245 /* but some return 0 for streams too, sigh */
249 if (saveifp) { /* must use old fp? */
250 fd = fileno(saveifp);
252 fflush(saveofp); /* emulate fclose() */
253 if (saveofp != saveifp) { /* was a socket? */
259 if (fd != fileno(fp)) {
263 dup2(fileno(fp), fd);
264 sv = *av_fetch(fdpid,fileno(fp),TRUE);
265 (void)SvUPGRADE(sv, SVt_IV);
268 sv = *av_fetch(fdpid,fd,TRUE);
269 (void)SvUPGRADE(sv, SVt_IV);
277 #if defined(HAS_FCNTL) && defined(F_SETFD)
279 fcntl(fd,F_SETFD,fd > maxsysfd);
283 if (IoTYPE(io) == 's'
284 || (IoTYPE(io) == '>' && S_ISCHR(statbuf.st_mode)) ) {
285 if (!(IoOFP(io) = fdopen(fileno(fp),"w"))) {
299 IoTYPE(io) = savetype;
308 #ifndef FLEXFILENAMES
316 argvoutgv = gv_fetchpv("ARGVOUT",TRUE,SVt_PVIO);
317 if (filemode & (S_ISUID|S_ISGID)) {
318 fflush(IoIFP(GvIOn(argvoutgv))); /* chmod must follow last write */
320 (void)fchmod(lastfd,filemode);
322 (void)chmod(oldname,filemode);
326 while (av_len(GvAV(gv)) >= 0) {
328 sv = av_shift(GvAV(gv));
330 sv_setsv(GvSV(gv),sv);
331 SvSETMAGIC(GvSV(gv));
332 oldname = SvPVx(GvSV(gv), len);
333 if (do_open(gv,oldname,len,Nullfp)) {
335 TAINT_PROPER("inplace open");
336 if (strEQ(oldname,"-")) {
337 defoutgv = gv_fetchpv("STDOUT",TRUE,SVt_PVIO);
338 return IoIFP(GvIOp(gv));
340 #ifndef FLEXFILENAMES
341 filedev = statbuf.st_dev;
342 fileino = statbuf.st_ino;
344 filemode = statbuf.st_mode;
345 fileuid = statbuf.st_uid;
346 filegid = statbuf.st_gid;
347 if (!S_ISREG(filemode)) {
348 warn("Can't do inplace edit: %s is not a regular file",
355 add_suffix(sv,inplace);
357 sv_catpv(sv,inplace);
359 #ifndef FLEXFILENAMES
360 if (Stat(SvPVX(sv),&statbuf) >= 0
361 && statbuf.st_dev == filedev
362 && statbuf.st_ino == fileino ) {
363 warn("Can't do inplace edit: %s > 14 characters",
371 if (rename(oldname,SvPVX(sv)) < 0) {
372 warn("Can't rename %s to %s: %s, skipping file",
373 oldname, SvPVX(sv), Strerror(errno) );
379 (void)unlink(SvPVX(sv));
380 (void)rename(oldname,SvPVX(sv));
381 do_open(gv,SvPVX(sv),SvCUR(GvSV(gv)),Nullfp);
384 (void)UNLINK(SvPVX(sv));
385 if (link(oldname,SvPVX(sv)) < 0) {
386 warn("Can't rename %s to %s: %s, skipping file",
387 oldname, SvPVX(sv), Strerror(errno) );
391 (void)UNLINK(oldname);
396 if (UNLINK(oldname) < 0) {
397 warn("Can't rename %s to %s: %s, skipping file",
398 oldname, SvPVX(sv), Strerror(errno) );
403 croak("Can't do inplace edit without backup");
408 sv_catpv(sv,oldname);
409 SETERRNO(0,0); /* in case sprintf set errno */
410 if (!do_open(argvoutgv,SvPVX(sv),SvCUR(sv),Nullfp)) {
411 warn("Can't do inplace edit on %s: %s",
412 oldname, Strerror(errno) );
416 defoutgv = argvoutgv;
417 lastfd = fileno(IoIFP(GvIOp(argvoutgv)));
418 (void)Fstat(lastfd,&statbuf);
420 (void)fchmod(lastfd,filemode);
422 (void)chmod(oldname,filemode);
424 if (fileuid != statbuf.st_uid || filegid != statbuf.st_gid) {
426 (void)fchown(lastfd,fileuid,filegid);
429 (void)chown(oldname,fileuid,filegid);
434 return IoIFP(GvIOp(gv));
437 fprintf(stderr,"Can't open %s: %s\n",SvPV(sv, na), Strerror(errno));
440 (void)do_close(argvoutgv,FALSE);
441 defoutgv = gv_fetchpv("STDOUT",TRUE,SVt_PVIO);
448 do_pipe(sv, rgv, wgv)
472 IoIFP(rstio) = fdopen(fd[0], "r");
473 IoOFP(wstio) = fdopen(fd[1], "w");
474 IoIFP(wstio) = IoOFP(wstio);
477 if (!IoIFP(rstio) || !IoOFP(wstio)) {
478 if (IoIFP(rstio)) fclose(IoIFP(rstio));
480 if (IoOFP(wstio)) fclose(IoOFP(wstio));
485 sv_setsv(sv,&sv_yes);
489 sv_setsv(sv,&sv_undef);
495 #ifndef CAN_PROTOTYPE
496 do_close(gv,explicit)
500 do_close(GV *gv, bool explicit)
501 #endif /* CAN_PROTOTYPE */
509 if (!gv || SvTYPE(gv) != SVt_PVGV) {
510 SETERRNO(EBADF,SS$_IVCHAN);
514 if (!io) { /* never opened */
515 if (dowarn && explicit)
516 warn("Close on unopened file <%s>",GvENAME(gv));
520 if (IoTYPE(io) == '|') {
521 status = my_pclose(IoIFP(io));
522 retval = (status == 0);
523 statusvalue = FIXSTATUS(status);
525 else if (IoTYPE(io) == '-')
528 if (IoOFP(io) && IoOFP(io) != IoIFP(io)) { /* a socket */
529 retval = (fclose(IoOFP(io)) != EOF);
530 fclose(IoIFP(io)); /* clear stdio, fd already closed */
533 retval = (fclose(IoIFP(io)) != EOF);
535 IoOFP(io) = IoIFP(io) = Nullfp;
540 IoLINES_LEFT(io) = IoPAGE_LEN(io);
560 #ifdef USE_STD_STDIO /* (the code works without this) */
561 if (IoIFP(io)->_cnt > 0) /* cheat a little, since */
562 return FALSE; /* this is the most usual case */
565 ch = getc(IoIFP(io));
567 (void)ungetc(ch, IoIFP(io));
571 if (IoIFP(io)->_cnt < -1)
572 IoIFP(io)->_cnt = -1;
574 if (op->op_flags & OPf_SPECIAL) { /* not necessarily a real EOF yet? */
575 if (!nextargv(argvgv)) /* get another fp handy */
579 return TRUE; /* normal fp, definitely end of file */
594 if (!io || !IoIFP(io))
597 #ifdef ULTRIX_STDIO_BOTCH
599 (void)fseek (IoIFP(io), 0L, 2); /* ultrix 1.2 workaround */
602 return ftell(IoIFP(io));
606 warn("tell() on unopened file");
607 SETERRNO(EBADF,RMS$_IFI);
612 do_seek(gv, pos, whence)
623 if (!io || !IoIFP(io))
626 #ifdef ULTRIX_STDIO_BOTCH
628 (void)fseek (IoIFP(io), 0L, 2); /* ultrix 1.2 workaround */
631 return fseek(IoIFP(io), pos, whence) >= 0;
635 warn("seek() on unopened file");
636 SETERRNO(EBADF,RMS$_IFI);
640 #if !defined(HAS_TRUNCATE) && !defined(HAS_CHSIZE) && defined(F_FREESP)
641 /* code courtesy of William Kucharski */
644 I32 chsize(fd, length)
645 I32 fd; /* file descriptor */
646 Off_t length; /* length to set file to */
652 if (Fstat(fd, &filebuf) < 0)
655 if (filebuf.st_size < length) {
657 /* extend file length */
659 if ((lseek(fd, (length - 1), 0)) < 0)
662 /* write a "0" byte */
664 if ((write(fd, "", 1)) != 1)
668 /* truncate length */
673 fl.l_type = F_WRLCK; /* write lock on file space */
676 * This relies on the UNDOCUMENTED F_FREESP argument to
677 * fcntl(2), which truncates the file so that it ends at the
678 * position indicated by fl.l_start.
680 * Will minor miracles never cease?
683 if (fcntl(fd, F_FREESP, &fl) < 0)
690 #endif /* F_FREESP */
693 looks_like_number(sv)
708 send = s + SvCUR(sv);
714 if (*s == '+' || *s == '-')
722 else if (s == SvPVX(sv))
728 if (*s == 'e' || *s == 'E') {
730 if (*s == '+' || *s == '-')
750 /* assuming fp is checked earlier */
756 if (SvIOK(sv) && SvIVX(sv) != 0) {
757 fprintf(fp, ofmt, (double)SvIVX(sv));
760 if ( (SvNOK(sv) && SvNVX(sv) != 0.0)
761 || (looks_like_number(sv) && sv_2nv(sv) != 0.0) ) {
762 fprintf(fp, ofmt, SvNVX(sv));
766 switch (SvTYPE(sv)) {
775 fprintf(fp, "%ld", (long)SvIVX(sv));
780 tmps = SvPV(sv, len);
783 if (len && (fwrite1(tmps,1,len,fp) == 0 || ferror(fp)))
796 if (op->op_flags & OPf_REF) {
798 tmpgv = cGVOP->op_gv;
801 if (io && IoIFP(io)) {
803 sv_setpv(statname,"");
805 return (laststatval = Fstat(fileno(IoIFP(io)), &statcache));
811 warn("Stat on unopened file <%s>",
814 sv_setpv(statname,"");
815 return (laststatval = -1);
821 if (SvTYPE(sv) == SVt_PVGV) {
825 else if (SvROK(sv) && SvTYPE(SvRV(sv)) == SVt_PVGV) {
826 tmpgv = (GV*)SvRV(sv);
831 sv_setpv(statname,SvPV(sv, na));
833 laststatval = Stat(SvPV(sv, na),&statcache);
834 if (laststatval < 0 && dowarn && strchr(SvPV(sv, na), '\n'))
835 warn(warn_nl, "stat");
846 if (op->op_flags & OPf_REF) {
848 if (cGVOP->op_gv == defgv) {
849 if (laststype != OP_LSTAT)
850 croak("The stat preceding -l _ wasn't an lstat");
853 croak("You can't use -l on a filehandle");
856 laststype = OP_LSTAT;
860 sv_setpv(statname,SvPV(sv, na));
862 laststatval = lstat(SvPV(sv, na),&statcache);
864 laststatval = Stat(SvPV(sv, na),&statcache);
866 if (laststatval < 0 && dowarn && strchr(SvPV(sv, na), '\n'))
867 warn(warn_nl, "lstat");
872 do_aexec(really,mark,sp)
881 New(401,Argv, sp - mark + 1, char*);
883 while (++mark <= sp) {
885 *a++ = SvPVx(*mark, na);
890 if (*Argv[0] != '/') /* will execvp use PATH? */
891 TAINT_ENV(); /* testing IFS here is overkill, probably */
892 if (really && *(tmps = SvPV(really, na)))
895 execvp(Argv[0],Argv);
897 warn("Can't exec \"%s\": %s", Argv[0], Strerror(errno));
908 Argv = Null(char **);
924 while (*cmd && isSPACE(*cmd))
927 /* save an extra exec if possible */
930 if (strnEQ(cmd,cshname,cshlen) && strnEQ(cmd+cshlen," -c",3)) {
948 execl(cshname,"csh", flags,ncmd,(char*)0);
956 /* see if there are shell metacharacters in it */
958 if (*cmd == '.' && isSPACE(cmd[1]))
961 if (strnEQ(cmd,"exec",4) && isSPACE(cmd[4]))
964 for (s = cmd; *s && isALPHA(*s); s++) ; /* catch VAR=val gizmo */
968 for (s = cmd; *s; s++) {
969 if (*s != ' ' && !isALPHA(*s) && strchr("$&*(){}[]'\";\\|?<>~`\n",*s)) {
970 if (*s == '\n' && !s[1]) {
975 execl("/bin/sh","sh","-c",cmd,(char*)0);
980 New(402,Argv, (s - cmd) / 2 + 2, char*);
981 Cmd = savepvn(cmd, s-cmd);
984 while (*s && isSPACE(*s)) s++;
987 while (*s && !isSPACE(*s)) s++;
993 execvp(Argv[0],Argv);
994 if (errno == ENOEXEC) { /* for system V NIH syndrome */
999 warn("Can't exec \"%s\": %s", Argv[0], Strerror(errno));
1013 register I32 tot = 0;
1015 SV **oldmark = mark;
1018 while (++mark <= sp) {
1020 if (SvMAGICAL(*mark) && (mg = mg_find(*mark, 't')) && mg->mg_len & 1)
1027 TAINT_PROPER("chmod");
1031 while (++mark <= sp) {
1032 if (chmod(SvPVx(*mark, na),val))
1039 TAINT_PROPER("chown");
1040 if (sp - mark > 2) {
1041 val = SvIVx(*++mark);
1042 val2 = SvIVx(*++mark);
1044 while (++mark <= sp) {
1045 if (chown(SvPVx(*mark, na),val,val2))
1053 TAINT_PROPER("kill");
1054 s = SvPVx(*++mark, na);
1057 if (*s == 'S' && s[1] == 'I' && s[2] == 'G')
1059 if (!(val = whichsig(s)))
1060 croak("Unrecognized signal name \"%s\"",s);
1066 while (++mark <= sp) {
1067 I32 proc = SvIVx(*mark);
1069 if (killpg(proc,val)) /* BSD */
1071 if (kill(-proc,val)) /* SYSV */
1077 while (++mark <= sp) {
1078 if (kill(SvIVx(*mark),val))
1085 TAINT_PROPER("unlink");
1087 while (++mark <= sp) {
1088 s = SvPVx(*mark, na);
1089 if (euid || unsafe) {
1093 else { /* don't let root wipe out directories without -U */
1095 if (lstat(s,&statbuf) < 0 || S_ISDIR(statbuf.st_mode))
1097 if (Stat(s,&statbuf) < 0 || S_ISDIR(statbuf.st_mode))
1109 TAINT_PROPER("utime");
1110 if (sp - mark > 2) {
1111 #if defined(I_UTIME) || defined(VMS)
1112 struct utimbuf utbuf;
1120 Zero(&utbuf, sizeof utbuf, char);
1121 utbuf.actime = SvIVx(*++mark); /* time accessed */
1122 utbuf.modtime = SvIVx(*++mark); /* time modified */
1124 while (++mark <= sp) {
1125 if (utime(SvPVx(*mark, na),&utbuf))
1137 /* Do the permissions allow some operation? Assumes statcache already set. */
1138 #ifndef VMS /* VMS' cando is in vms.c */
1140 cando(bit, effective, statbufp)
1143 register struct stat *statbufp;
1146 /* [Comments and code from Len Reed]
1147 * MS-DOS "user" is similar to UNIX's "superuser," but can't write
1148 * to write-protected files. The execute permission bit is set
1149 * by the Miscrosoft C library stat() function for the following:
1154 * All files and directories are readable.
1155 * Directories and special files, e.g. "CON", cannot be
1157 * [Comment by Tom Dinger -- a directory can have the write-protect
1158 * bit set in the file system, but DOS permits changes to
1159 * the directory anyway. In addition, all bets are off
1160 * here for networked software, such as Novell and
1164 /* Atari stat() does pretty much the same thing. we set x_bit_set_in_stat
1165 * too so it will actually look into the files for magic numbers
1167 return (bit & statbufp->st_mode) ? TRUE : FALSE;
1170 if ((effective ? euid : uid) == 0) { /* root is special */
1171 if (bit == S_IXUSR) {
1172 if (statbufp->st_mode & 0111 || S_ISDIR(statbufp->st_mode))
1176 return TRUE; /* root reads and writes anything */
1179 if (statbufp->st_uid == (effective ? euid : uid) ) {
1180 if (statbufp->st_mode & bit)
1181 return TRUE; /* ok as "user" */
1183 else if (ingroup((I32)statbufp->st_gid,effective)) {
1184 if (statbufp->st_mode & bit >> 3)
1185 return TRUE; /* ok as "group" */
1187 else if (statbufp->st_mode & bit >> 6)
1188 return TRUE; /* ok as "other" */
1190 #endif /* ! MSDOS */
1195 ingroup(testgid,effective)
1199 if (testgid == (effective ? egid : gid))
1201 #ifdef HAS_GETGROUPS
1206 Groups_t gary[NGROUPS];
1209 anum = getgroups(NGROUPS,gary);
1211 if (gary[anum] == testgid)
1218 #if defined(HAS_MSG) || defined(HAS_SEM) || defined(HAS_SHM)
1221 do_ipcget(optype, mark, sp)
1229 key = (key_t)SvNVx(*++mark);
1230 n = (optype == OP_MSGGET) ? 0 : SvIVx(*++mark);
1231 flags = SvIVx(*++mark);
1237 return msgget(key, flags);
1241 return semget(key, n, flags);
1245 return shmget(key, n, flags);
1247 #if !defined(HAS_MSG) || !defined(HAS_SEM) || !defined(HAS_SHM)
1249 croak("%s not implemented", op_name[optype]);
1252 return -1; /* should never happen */
1256 do_ipcctl(optype, mark, sp)
1263 I32 id, n, cmd, infosize, getinfo;
1266 id = SvIVx(*++mark);
1267 n = (optype == OP_SEMCTL) ? SvIVx(*++mark) : 0;
1268 cmd = SvIVx(*++mark);
1271 getinfo = (cmd == IPC_STAT);
1277 if (cmd == IPC_STAT || cmd == IPC_SET)
1278 infosize = sizeof(struct msqid_ds);
1283 if (cmd == IPC_STAT || cmd == IPC_SET)
1284 infosize = sizeof(struct shmid_ds);
1289 if (cmd == IPC_STAT || cmd == IPC_SET)
1290 infosize = sizeof(struct semid_ds);
1291 else if (cmd == GETALL || cmd == SETALL)
1293 struct semid_ds semds;
1294 if (semctl(id, 0, IPC_STAT, &semds) == -1)
1296 getinfo = (cmd == GETALL);
1297 infosize = semds.sem_nsems * sizeof(short);
1298 /* "short" is technically wrong but much more portable
1299 than guessing about u_?short(_t)? */
1303 #if !defined(HAS_MSG) || !defined(HAS_SEM) || !defined(HAS_SHM)
1305 croak("%s not implemented", op_name[optype]);
1314 SvPV_force(astr, len);
1315 a = SvGROW(astr, infosize+1);
1319 a = SvPV(astr, len);
1320 if (len != infosize)
1321 croak("Bad arg length for %s, is %d, should be %d",
1322 op_name[optype], len, infosize);
1328 a = (char *)i; /* ouch */
1335 ret = msgctl(id, cmd, (struct msqid_ds *)a);
1340 ret = semctl(id, n, cmd, (struct semid_ds *)a);
1345 ret = shmctl(id, cmd, (struct shmid_ds *)a);
1349 if (getinfo && ret >= 0) {
1350 SvCUR_set(astr, infosize);
1351 *SvEND(astr) = '\0';
1365 I32 id, msize, flags;
1368 id = SvIVx(*++mark);
1370 flags = SvIVx(*++mark);
1371 mbuf = SvPV(mstr, len);
1372 if ((msize = len - sizeof(long)) < 0)
1373 croak("Arg too short for msgsnd");
1375 return msgsnd(id, (struct msgbuf *)mbuf, msize, flags);
1377 croak("msgsnd not implemented");
1390 I32 id, msize, flags, ret;
1393 id = SvIVx(*++mark);
1395 msize = SvIVx(*++mark);
1396 mtype = (long)SvIVx(*++mark);
1397 flags = SvIVx(*++mark);
1398 if (SvTHINKFIRST(mstr)) {
1399 if (SvREADONLY(mstr))
1400 croak("Can't msgrcv to readonly var");
1404 SvPV_force(mstr, len);
1405 mbuf = SvGROW(mstr, sizeof(long)+msize+1);
1408 ret = msgrcv(id, (struct msgbuf *)mbuf, msize, mtype, flags);
1410 SvCUR_set(mstr, sizeof(long)+ret);
1411 *SvEND(mstr) = '\0';
1415 croak("msgrcv not implemented");
1430 id = SvIVx(*++mark);
1432 opbuf = SvPV(opstr, opsize);
1433 if (opsize < sizeof(struct sembuf)
1434 || (opsize % sizeof(struct sembuf)) != 0) {
1435 SETERRNO(EINVAL,LIB$_INVARG);
1439 return semop(id, (struct sembuf *)opbuf, opsize/sizeof(struct sembuf));
1441 croak("semop not implemented");
1446 do_shmio(optype, mark, sp)
1454 I32 id, mpos, msize;
1456 struct shmid_ds shmds;
1458 id = SvIVx(*++mark);
1460 mpos = SvIVx(*++mark);
1461 msize = SvIVx(*++mark);
1463 if (shmctl(id, IPC_STAT, &shmds) == -1)
1465 if (mpos < 0 || msize < 0 || mpos + msize > shmds.shm_segsz) {
1466 SETERRNO(EFAULT,SS$_ACCVIO); /* can't do as caller requested */
1469 shm = (Shmat_t)shmat(id, (char*)NULL, (optype == OP_SHMREAD) ? SHM_RDONLY : 0);
1470 if (shm == (char *)-1) /* I hate System V IPC, I really do */
1472 if (optype == OP_SHMREAD) {
1473 SvPV_force(mstr, len);
1474 mbuf = SvGROW(mstr, msize+1);
1476 Copy(shm + mpos, mbuf, msize, char);
1477 SvCUR_set(mstr, msize);
1478 *SvEND(mstr) = '\0';
1484 mbuf = SvPV(mstr, len);
1485 if ((n = len) > msize)
1487 Copy(mbuf, shm + mpos, n, char);
1489 memzero(shm + mpos + n, msize - n);
1493 croak("shm I/O not implemented");
1497 #endif /* SYSV IPC */