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));
46 #if defined(HAS_SOCKET) && !defined(VMS) /* VMS handles sockets via vmsish.h */
47 # include <sys/socket.h>
51 # include <net/errno.h>
57 do_open(gv,name,len,supplied_fp)
64 register IO *io = GvIOn(gv);
65 char *myname = savepv(name);
70 char mode[3]; /* stdio file mode ("r\0" or "r+\0") */
71 FILE *saveifp = Nullfp;
72 FILE *saveofp = Nullfp;
76 mode[0] = mode[1] = mode[2] = '\0';
78 forkprocess = 1; /* assume true if no fork */
79 while (len && isSPACE(name[len-1]))
82 fd = fileno(IoIFP(io));
83 if (IoTYPE(io) == '-')
85 else if (fd <= maxsysfd) {
88 savetype = IoTYPE(io);
91 else if (IoTYPE(io) == '|')
92 result = my_pclose(IoIFP(io));
93 else if (IoIFP(io) != IoOFP(io)) {
95 result = fclose(IoOFP(io));
96 fclose(IoIFP(io)); /* clear stdio, fd already closed */
99 result = fclose(IoIFP(io));
102 result = fclose(IoIFP(io));
103 if (result == EOF && fd > maxsysfd)
104 fprintf(stderr,"Warning: unable to close filehandle %s properly.\n",
106 IoOFP(io) = IoIFP(io) = Nullfp;
108 if (*name == '+' && len > 1 && name[len-1] != '|') { /* scary */
120 for (name++; isSPACE(*name); name++) ;
123 TAINT_PROPER("piped open");
124 if (dowarn && name[strlen(name)-1] == '|')
125 warn("Can't do bidirectional pipe");
126 fp = my_popen(name,"w");
129 else if (*name == '>') {
130 TAINT_PROPER("open");
133 mode[0] = IoTYPE(io) = 'a';
147 if (!*name && supplied_fp)
150 while (isSPACE(*name))
156 gv = gv_fetchpv(name,FALSE,SVt_PVIO);
160 SETERRNO(EINVAL,SS$_IVCHAN);
165 fd = fileno(IoIFP(thatio));
166 if (IoTYPE(thatio) == 's')
174 if (!(fp = fdopen(fd,mode)))
180 while (isSPACE(*name))
182 if (strEQ(name,"-")) {
187 fp = fopen(name,mode);
195 while (isSPACE(*name))
199 if (strEQ(name,"-")) {
204 fp = fopen(name,mode);
206 else if (name[len-1] == '|') {
208 while (len && isSPACE(name[len-1]))
211 for (; isSPACE(*name); name++) ;
214 TAINT_PROPER("piped open");
215 fp = my_popen(name,"r");
221 for (; isSPACE(*name); name++) ;
222 if (strEQ(name,"-")) {
227 fp = fopen(name,"r");
231 if (dowarn && IoTYPE(io) == '<' && strchr(name, '\n'))
232 warn(warn_nl, "open");
236 IoTYPE(io) != '|' && IoTYPE(io) != '-') {
237 if (Fstat(fileno(fp),&statbuf) < 0) {
241 if (S_ISSOCK(statbuf.st_mode))
242 IoTYPE(io) = 's'; /* in case a socket was passed in to us */
246 !(statbuf.st_mode & S_IFMT)
251 int buflen = sizeof tokenbuf;
252 if (getsockname(fileno(fp), (struct sockaddr *)tokenbuf, &buflen) >= 0
253 || errno != ENOTSOCK)
254 IoTYPE(io) = 's'; /* some OS's return 0 on fstat()ed socket */
255 /* but some return 0 for streams too, sigh */
259 if (saveifp) { /* must use old fp? */
260 fd = fileno(saveifp);
262 fflush(saveofp); /* emulate fclose() */
263 if (saveofp != saveifp) { /* was a socket? */
269 if (fd != fileno(fp)) {
273 dup2(fileno(fp), fd);
274 sv = *av_fetch(fdpid,fileno(fp),TRUE);
275 (void)SvUPGRADE(sv, SVt_IV);
278 sv = *av_fetch(fdpid,fd,TRUE);
279 (void)SvUPGRADE(sv, SVt_IV);
287 #if defined(HAS_FCNTL) && defined(F_SETFD)
289 fcntl(fd,F_SETFD,fd > maxsysfd);
293 if (IoTYPE(io) == 's'
294 || (IoTYPE(io) == '>' && S_ISCHR(statbuf.st_mode)) ) {
295 if (!(IoOFP(io) = fdopen(fileno(fp),"w"))) {
309 IoTYPE(io) = savetype;
318 #ifndef FLEXFILENAMES
326 argvoutgv = gv_fetchpv("ARGVOUT",TRUE,SVt_PVIO);
327 if (filemode & (S_ISUID|S_ISGID)) {
328 fflush(IoIFP(GvIOn(argvoutgv))); /* chmod must follow last write */
330 (void)fchmod(lastfd,filemode);
332 (void)chmod(oldname,filemode);
336 while (av_len(GvAV(gv)) >= 0) {
338 sv = av_shift(GvAV(gv));
340 sv_setsv(GvSV(gv),sv);
341 SvSETMAGIC(GvSV(gv));
342 oldname = SvPVx(GvSV(gv), len);
343 if (do_open(gv,oldname,len,Nullfp)) {
345 TAINT_PROPER("inplace open");
346 if (strEQ(oldname,"-")) {
347 setdefout(gv_fetchpv("STDOUT",TRUE,SVt_PVIO));
348 return IoIFP(GvIOp(gv));
350 #ifndef FLEXFILENAMES
351 filedev = statbuf.st_dev;
352 fileino = statbuf.st_ino;
354 filemode = statbuf.st_mode;
355 fileuid = statbuf.st_uid;
356 filegid = statbuf.st_gid;
357 if (!S_ISREG(filemode)) {
358 warn("Can't do inplace edit: %s is not a regular file",
365 add_suffix(sv,inplace);
367 sv_catpv(sv,inplace);
369 #ifndef FLEXFILENAMES
370 if (Stat(SvPVX(sv),&statbuf) >= 0
371 && statbuf.st_dev == filedev
372 && statbuf.st_ino == fileino ) {
373 warn("Can't do inplace edit: %s > 14 characters",
381 if (rename(oldname,SvPVX(sv)) < 0) {
382 warn("Can't rename %s to %s: %s, skipping file",
383 oldname, SvPVX(sv), Strerror(errno) );
389 (void)unlink(SvPVX(sv));
390 (void)rename(oldname,SvPVX(sv));
391 do_open(gv,SvPVX(sv),SvCUR(GvSV(gv)),Nullfp);
394 (void)UNLINK(SvPVX(sv));
395 if (link(oldname,SvPVX(sv)) < 0) {
396 warn("Can't rename %s to %s: %s, skipping file",
397 oldname, SvPVX(sv), Strerror(errno) );
401 (void)UNLINK(oldname);
406 if (UNLINK(oldname) < 0) {
407 warn("Can't rename %s to %s: %s, skipping file",
408 oldname, SvPVX(sv), Strerror(errno) );
413 croak("Can't do inplace edit without backup");
418 sv_catpv(sv,oldname);
419 SETERRNO(0,0); /* in case sprintf set errno */
420 if (!do_open(argvoutgv,SvPVX(sv),SvCUR(sv),Nullfp)) {
421 warn("Can't do inplace edit on %s: %s",
422 oldname, Strerror(errno) );
426 setdefout(argvoutgv);
427 lastfd = fileno(IoIFP(GvIOp(argvoutgv)));
428 (void)Fstat(lastfd,&statbuf);
430 (void)fchmod(lastfd,filemode);
432 (void)chmod(oldname,filemode);
434 if (fileuid != statbuf.st_uid || filegid != statbuf.st_gid) {
436 (void)fchown(lastfd,fileuid,filegid);
439 (void)chown(oldname,fileuid,filegid);
444 return IoIFP(GvIOp(gv));
447 fprintf(stderr,"Can't open %s: %s\n",SvPV(sv, na), Strerror(errno));
450 (void)do_close(argvoutgv,FALSE);
451 setdefout(gv_fetchpv("STDOUT",TRUE,SVt_PVIO));
458 do_pipe(sv, rgv, wgv)
482 IoIFP(rstio) = fdopen(fd[0], "r");
483 IoOFP(wstio) = fdopen(fd[1], "w");
484 IoIFP(wstio) = IoOFP(wstio);
487 if (!IoIFP(rstio) || !IoOFP(wstio)) {
488 if (IoIFP(rstio)) fclose(IoIFP(rstio));
490 if (IoOFP(wstio)) fclose(IoOFP(wstio));
495 sv_setsv(sv,&sv_yes);
499 sv_setsv(sv,&sv_undef);
505 #ifndef CAN_PROTOTYPE
506 do_close(gv,explicit)
510 do_close(GV *gv, bool explicit)
511 #endif /* CAN_PROTOTYPE */
519 if (!gv || SvTYPE(gv) != SVt_PVGV) {
520 SETERRNO(EBADF,SS$_IVCHAN);
524 if (!io) { /* never opened */
525 if (dowarn && explicit)
526 warn("Close on unopened file <%s>",GvENAME(gv));
530 if (IoTYPE(io) == '|') {
531 status = my_pclose(IoIFP(io));
532 retval = (status == 0);
533 statusvalue = FIXSTATUS(status);
535 else if (IoTYPE(io) == '-')
538 if (IoOFP(io) && IoOFP(io) != IoIFP(io)) { /* a socket */
539 retval = (fclose(IoOFP(io)) != EOF);
540 fclose(IoIFP(io)); /* clear stdio, fd already closed */
543 retval = (fclose(IoIFP(io)) != EOF);
545 IoOFP(io) = IoIFP(io) = Nullfp;
550 IoLINES_LEFT(io) = IoPAGE_LEN(io);
570 #ifdef USE_STDIO_PTR /* (the code works without this) */
571 if (FILE_cnt(IoIFP(io)) > 0) /* cheat a little, since */
572 return FALSE; /* this is the most usual case */
575 ch = getc(IoIFP(io));
577 (void)ungetc(ch, IoIFP(io));
580 #if defined(USE_STDIO_PTR) && defined(STDIO_CNT_LVALUE)
581 if (FILE_cnt(IoIFP(io)) < -1)
582 FILE_cnt(IoIFP(io)) = -1;
584 if (op->op_flags & OPf_SPECIAL) { /* not necessarily a real EOF yet? */
585 if (!nextargv(argvgv)) /* get another fp handy */
589 return TRUE; /* normal fp, definitely end of file */
604 if (!io || !IoIFP(io))
607 #ifdef ULTRIX_STDIO_BOTCH
609 (void)fseek (IoIFP(io), 0L, 2); /* ultrix 1.2 workaround */
612 return ftell(IoIFP(io));
616 warn("tell() on unopened file");
617 SETERRNO(EBADF,RMS$_IFI);
622 do_seek(gv, pos, whence)
633 if (!io || !IoIFP(io))
636 #ifdef ULTRIX_STDIO_BOTCH
638 (void)fseek (IoIFP(io), 0L, 2); /* ultrix 1.2 workaround */
641 return fseek(IoIFP(io), pos, whence) >= 0;
645 warn("seek() on unopened file");
646 SETERRNO(EBADF,RMS$_IFI);
650 #if !defined(HAS_TRUNCATE) && !defined(HAS_CHSIZE) && defined(F_FREESP)
651 /* code courtesy of William Kucharski */
654 I32 chsize(fd, length)
655 I32 fd; /* file descriptor */
656 Off_t length; /* length to set file to */
662 if (Fstat(fd, &filebuf) < 0)
665 if (filebuf.st_size < length) {
667 /* extend file length */
669 if ((lseek(fd, (length - 1), 0)) < 0)
672 /* write a "0" byte */
674 if ((write(fd, "", 1)) != 1)
678 /* truncate length */
683 fl.l_type = F_WRLCK; /* write lock on file space */
686 * This relies on the UNDOCUMENTED F_FREESP argument to
687 * fcntl(2), which truncates the file so that it ends at the
688 * position indicated by fl.l_start.
690 * Will minor miracles never cease?
693 if (fcntl(fd, F_FREESP, &fl) < 0)
700 #endif /* F_FREESP */
703 looks_like_number(sv)
718 send = s + SvCUR(sv);
724 if (*s == '+' || *s == '-')
732 else if (s == SvPVX(sv))
738 if (*s == 'e' || *s == 'E') {
740 if (*s == '+' || *s == '-')
760 /* assuming fp is checked earlier */
766 if (SvIOK(sv) && SvIVX(sv) != 0) {
767 fprintf(fp, ofmt, (double)SvIVX(sv));
770 if ( (SvNOK(sv) && SvNVX(sv) != 0.0)
771 || (looks_like_number(sv) && sv_2nv(sv) != 0.0) ) {
772 fprintf(fp, ofmt, SvNVX(sv));
776 switch (SvTYPE(sv)) {
785 fprintf(fp, "%ld", (long)SvIVX(sv));
790 tmps = SvPV(sv, len);
793 if (len && (fwrite1(tmps,1,len,fp) == 0 || ferror(fp)))
806 if (op->op_flags & OPf_REF) {
808 tmpgv = cGVOP->op_gv;
811 if (io && IoIFP(io)) {
813 sv_setpv(statname,"");
815 return (laststatval = Fstat(fileno(IoIFP(io)), &statcache));
821 warn("Stat on unopened file <%s>",
824 sv_setpv(statname,"");
825 return (laststatval = -1);
831 if (SvTYPE(sv) == SVt_PVGV) {
835 else if (SvROK(sv) && SvTYPE(SvRV(sv)) == SVt_PVGV) {
836 tmpgv = (GV*)SvRV(sv);
841 sv_setpv(statname,SvPV(sv, na));
843 laststatval = Stat(SvPV(sv, na),&statcache);
844 if (laststatval < 0 && dowarn && strchr(SvPV(sv, na), '\n'))
845 warn(warn_nl, "stat");
856 if (op->op_flags & OPf_REF) {
858 if (cGVOP->op_gv == defgv) {
859 if (laststype != OP_LSTAT)
860 croak("The stat preceding -l _ wasn't an lstat");
863 croak("You can't use -l on a filehandle");
866 laststype = OP_LSTAT;
870 sv_setpv(statname,SvPV(sv, na));
872 laststatval = lstat(SvPV(sv, na),&statcache);
874 laststatval = Stat(SvPV(sv, na),&statcache);
876 if (laststatval < 0 && dowarn && strchr(SvPV(sv, na), '\n'))
877 warn(warn_nl, "lstat");
882 do_aexec(really,mark,sp)
891 New(401,Argv, sp - mark + 1, char*);
893 while (++mark <= sp) {
895 *a++ = SvPVx(*mark, na);
900 if (*Argv[0] != '/') /* will execvp use PATH? */
901 TAINT_ENV(); /* testing IFS here is overkill, probably */
902 if (really && *(tmps = SvPV(really, na)))
905 execvp(Argv[0],Argv);
907 warn("Can't exec \"%s\": %s", Argv[0], Strerror(errno));
918 Argv = Null(char **);
934 while (*cmd && isSPACE(*cmd))
937 /* save an extra exec if possible */
940 if (strnEQ(cmd,cshname,cshlen) && strnEQ(cmd+cshlen," -c",3)) {
958 execl(cshname,"csh", flags,ncmd,(char*)0);
966 /* see if there are shell metacharacters in it */
968 if (*cmd == '.' && isSPACE(cmd[1]))
971 if (strnEQ(cmd,"exec",4) && isSPACE(cmd[4]))
974 for (s = cmd; *s && isALPHA(*s); s++) ; /* catch VAR=val gizmo */
978 for (s = cmd; *s; s++) {
979 if (*s != ' ' && !isALPHA(*s) && strchr("$&*(){}[]'\";\\|?<>~`\n",*s)) {
980 if (*s == '\n' && !s[1]) {
985 execl("/bin/sh","sh","-c",cmd,(char*)0);
990 New(402,Argv, (s - cmd) / 2 + 2, char*);
991 Cmd = savepvn(cmd, s-cmd);
994 while (*s && isSPACE(*s)) s++;
997 while (*s && !isSPACE(*s)) s++;
1003 execvp(Argv[0],Argv);
1004 if (errno == ENOEXEC) { /* for system V NIH syndrome */
1009 warn("Can't exec \"%s\": %s", Argv[0], Strerror(errno));
1023 register I32 tot = 0;
1025 SV **oldmark = mark;
1028 while (++mark <= sp) {
1030 if (SvMAGICAL(*mark) && (mg = mg_find(*mark, 't')) && mg->mg_len & 1)
1037 TAINT_PROPER("chmod");
1041 while (++mark <= sp) {
1042 if (chmod(SvPVx(*mark, na),val))
1049 TAINT_PROPER("chown");
1050 if (sp - mark > 2) {
1051 val = SvIVx(*++mark);
1052 val2 = SvIVx(*++mark);
1054 while (++mark <= sp) {
1055 if (chown(SvPVx(*mark, na),val,val2))
1063 TAINT_PROPER("kill");
1064 s = SvPVx(*++mark, na);
1067 if (*s == 'S' && s[1] == 'I' && s[2] == 'G')
1069 if (!(val = whichsig(s)))
1070 croak("Unrecognized signal name \"%s\"",s);
1075 /* kill() doesn't do process groups (job trees?) under VMS */
1076 if (val < 0) val = -val;
1077 if (val == SIGKILL) {
1078 # include <starlet.h>
1079 /* Use native sys$delprc() to insure that target process is
1080 * deleted; supervisor-mode images don't pay attention to
1081 * CRTL's emulation of Unix-style signals and kill()
1083 while (++mark <= sp) {
1084 I32 proc = SvIVx(*mark);
1085 register unsigned long int __vmssts;
1086 if (!((__vmssts = sys$delprc(&proc,0)) & 1)) {
1090 case SS$_NOSUCHNODE:
1091 SETERRNO(ESRCH,__vmssts);
1094 SETERRNO(EPERM,__vmssts);
1097 SETERRNO(EVMSERR,__vmssts);
1106 while (++mark <= sp) {
1107 I32 proc = SvIVx(*mark);
1109 if (killpg(proc,val)) /* BSD */
1111 if (kill(-proc,val)) /* SYSV */
1117 while (++mark <= sp) {
1118 if (kill(SvIVx(*mark),val))
1125 TAINT_PROPER("unlink");
1127 while (++mark <= sp) {
1128 s = SvPVx(*mark, na);
1129 if (euid || unsafe) {
1133 else { /* don't let root wipe out directories without -U */
1135 if (lstat(s,&statbuf) < 0 || S_ISDIR(statbuf.st_mode))
1137 if (Stat(s,&statbuf) < 0 || S_ISDIR(statbuf.st_mode))
1149 TAINT_PROPER("utime");
1150 if (sp - mark > 2) {
1151 #if defined(I_UTIME) || defined(VMS)
1152 struct utimbuf utbuf;
1160 Zero(&utbuf, sizeof utbuf, char);
1161 utbuf.actime = SvIVx(*++mark); /* time accessed */
1162 utbuf.modtime = SvIVx(*++mark); /* time modified */
1164 while (++mark <= sp) {
1165 if (utime(SvPVx(*mark, na),&utbuf))
1177 /* Do the permissions allow some operation? Assumes statcache already set. */
1178 #ifndef VMS /* VMS' cando is in vms.c */
1180 cando(bit, effective, statbufp)
1183 register struct stat *statbufp;
1186 /* [Comments and code from Len Reed]
1187 * MS-DOS "user" is similar to UNIX's "superuser," but can't write
1188 * to write-protected files. The execute permission bit is set
1189 * by the Miscrosoft C library stat() function for the following:
1194 * All files and directories are readable.
1195 * Directories and special files, e.g. "CON", cannot be
1197 * [Comment by Tom Dinger -- a directory can have the write-protect
1198 * bit set in the file system, but DOS permits changes to
1199 * the directory anyway. In addition, all bets are off
1200 * here for networked software, such as Novell and
1204 /* Atari stat() does pretty much the same thing. we set x_bit_set_in_stat
1205 * too so it will actually look into the files for magic numbers
1207 return (bit & statbufp->st_mode) ? TRUE : FALSE;
1210 if ((effective ? euid : uid) == 0) { /* root is special */
1211 if (bit == S_IXUSR) {
1212 if (statbufp->st_mode & 0111 || S_ISDIR(statbufp->st_mode))
1216 return TRUE; /* root reads and writes anything */
1219 if (statbufp->st_uid == (effective ? euid : uid) ) {
1220 if (statbufp->st_mode & bit)
1221 return TRUE; /* ok as "user" */
1223 else if (ingroup((I32)statbufp->st_gid,effective)) {
1224 if (statbufp->st_mode & bit >> 3)
1225 return TRUE; /* ok as "group" */
1227 else if (statbufp->st_mode & bit >> 6)
1228 return TRUE; /* ok as "other" */
1230 #endif /* ! MSDOS */
1235 ingroup(testgid,effective)
1239 if (testgid == (effective ? egid : gid))
1241 #ifdef HAS_GETGROUPS
1246 Groups_t gary[NGROUPS];
1249 anum = getgroups(NGROUPS,gary);
1251 if (gary[anum] == testgid)
1258 #if defined(HAS_MSG) || defined(HAS_SEM) || defined(HAS_SHM)
1261 do_ipcget(optype, mark, sp)
1269 key = (key_t)SvNVx(*++mark);
1270 n = (optype == OP_MSGGET) ? 0 : SvIVx(*++mark);
1271 flags = SvIVx(*++mark);
1277 return msgget(key, flags);
1281 return semget(key, n, flags);
1285 return shmget(key, n, flags);
1287 #if !defined(HAS_MSG) || !defined(HAS_SEM) || !defined(HAS_SHM)
1289 croak("%s not implemented", op_name[optype]);
1292 return -1; /* should never happen */
1296 do_ipcctl(optype, mark, sp)
1303 I32 id, n, cmd, infosize, getinfo;
1306 id = SvIVx(*++mark);
1307 n = (optype == OP_SEMCTL) ? SvIVx(*++mark) : 0;
1308 cmd = SvIVx(*++mark);
1311 getinfo = (cmd == IPC_STAT);
1317 if (cmd == IPC_STAT || cmd == IPC_SET)
1318 infosize = sizeof(struct msqid_ds);
1323 if (cmd == IPC_STAT || cmd == IPC_SET)
1324 infosize = sizeof(struct shmid_ds);
1329 if (cmd == IPC_STAT || cmd == IPC_SET)
1330 infosize = sizeof(struct semid_ds);
1331 else if (cmd == GETALL || cmd == SETALL)
1333 struct semid_ds semds;
1334 if (semctl(id, 0, IPC_STAT, &semds) == -1)
1336 getinfo = (cmd == GETALL);
1337 infosize = semds.sem_nsems * sizeof(short);
1338 /* "short" is technically wrong but much more portable
1339 than guessing about u_?short(_t)? */
1343 #if !defined(HAS_MSG) || !defined(HAS_SEM) || !defined(HAS_SHM)
1345 croak("%s not implemented", op_name[optype]);
1354 SvPV_force(astr, len);
1355 a = SvGROW(astr, infosize+1);
1359 a = SvPV(astr, len);
1360 if (len != infosize)
1361 croak("Bad arg length for %s, is %d, should be %d",
1362 op_name[optype], len, infosize);
1368 a = (char *)i; /* ouch */
1375 ret = msgctl(id, cmd, (struct msqid_ds *)a);
1380 ret = semctl(id, n, cmd, (struct semid_ds *)a);
1385 ret = shmctl(id, cmd, (struct shmid_ds *)a);
1389 if (getinfo && ret >= 0) {
1390 SvCUR_set(astr, infosize);
1391 *SvEND(astr) = '\0';
1405 I32 id, msize, flags;
1408 id = SvIVx(*++mark);
1410 flags = SvIVx(*++mark);
1411 mbuf = SvPV(mstr, len);
1412 if ((msize = len - sizeof(long)) < 0)
1413 croak("Arg too short for msgsnd");
1415 return msgsnd(id, (struct msgbuf *)mbuf, msize, flags);
1417 croak("msgsnd not implemented");
1430 I32 id, msize, flags, ret;
1433 id = SvIVx(*++mark);
1435 msize = SvIVx(*++mark);
1436 mtype = (long)SvIVx(*++mark);
1437 flags = SvIVx(*++mark);
1438 if (SvTHINKFIRST(mstr)) {
1439 if (SvREADONLY(mstr))
1440 croak("Can't msgrcv to readonly var");
1444 SvPV_force(mstr, len);
1445 mbuf = SvGROW(mstr, sizeof(long)+msize+1);
1448 ret = msgrcv(id, (struct msgbuf *)mbuf, msize, mtype, flags);
1450 SvCUR_set(mstr, sizeof(long)+ret);
1451 *SvEND(mstr) = '\0';
1455 croak("msgrcv not implemented");
1470 id = SvIVx(*++mark);
1472 opbuf = SvPV(opstr, opsize);
1473 if (opsize < sizeof(struct sembuf)
1474 || (opsize % sizeof(struct sembuf)) != 0) {
1475 SETERRNO(EINVAL,LIB$_INVARG);
1479 return semop(id, (struct sembuf *)opbuf, opsize/sizeof(struct sembuf));
1481 croak("semop not implemented");
1486 do_shmio(optype, mark, sp)
1494 I32 id, mpos, msize;
1496 struct shmid_ds shmds;
1498 id = SvIVx(*++mark);
1500 mpos = SvIVx(*++mark);
1501 msize = SvIVx(*++mark);
1503 if (shmctl(id, IPC_STAT, &shmds) == -1)
1505 if (mpos < 0 || msize < 0 || mpos + msize > shmds.shm_segsz) {
1506 SETERRNO(EFAULT,SS$_ACCVIO); /* can't do as caller requested */
1509 shm = (Shmat_t)shmat(id, (char*)NULL, (optype == OP_SHMREAD) ? SHM_RDONLY : 0);
1510 if (shm == (char *)-1) /* I hate System V IPC, I really do */
1512 if (optype == OP_SHMREAD) {
1513 SvPV_force(mstr, len);
1514 mbuf = SvGROW(mstr, msize+1);
1516 Copy(shm + mpos, mbuf, msize, char);
1517 SvCUR_set(mstr, msize);
1518 *SvEND(mstr) = '\0';
1524 mbuf = SvPV(mstr, len);
1525 if ((n = len) > msize)
1527 Copy(mbuf, shm + mpos, n, char);
1529 memzero(shm + mpos + n, msize - n);
1533 croak("shm I/O not implemented");
1537 #endif /* SYSV IPC */