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/* $RCSfile: doio.c,v $$Revision: 4.1 $$Date: 92/08/07 17:19:42 $
*
* Copyright (c) 1991, Larry Wall
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
* $Log: doio.c,v $
* Revision 4.1 92/08/07 17:19:42 lwall
* Stage 6 Snapshot
*
* Revision 4.0.1.6 92/06/11 21:08:16 lwall
* patch34: some systems don't declare h_errno extern in header files
*
* Revision 4.0.1.5 92/06/08 13:00:21 lwall
* patch20: some machines don't define ENOTSOCK in errno.h
* patch20: new warnings for failed use of stat operators on filenames with \n
* patch20: wait failed when STDOUT or STDERR reopened to a pipe
* patch20: end of file latch not reset on reopen of STDIN
* patch20: seek(HANDLE, 0, 1) went to eof because of ancient Ultrix workaround
* patch20: fixed memory leak on system() for vfork() machines
* patch20: get*by* routines now return something useful in a scalar context
* patch20: h_errno now accessible via $?
*
* Revision 4.0.1.4 91/11/05 16:51:43 lwall
* patch11: prepared for ctype implementations that don't define isascii()
* patch11: perl mistook some streams for sockets because they return mode 0 too
* patch11: reopening STDIN, STDOUT and STDERR failed on some machines
* patch11: certain perl errors should set EBADF so that $! looks better
* patch11: truncate on a closed filehandle could dump
* patch11: stats of _ forgot whether prior stat was actually lstat
* patch11: -T returned true on NFS directory
*
* Revision 4.0.1.3 91/06/10 01:21:19 lwall
* patch10: read didn't work from character special files open for writing
* patch10: close-on-exec wrongly set on system file descriptors
*
* Revision 4.0.1.2 91/06/07 10:53:39 lwall
* patch4: new copyright notice
* patch4: system fd's are now treated specially
* patch4: added $^F variable to specify maximum system fd, default 2
* patch4: character special files now opened with bidirectional stdio buffers
* patch4: taintchecks could improperly modify parent in vfork()
* patch4: many, many itty-bitty portability fixes
*
* Revision 4.0.1.1 91/04/11 17:41:06 lwall
* patch1: hopefully straightened out some of the Xenix mess
*
* Revision 4.0 91/03/20 01:07:06 lwall
* 4.0 baseline.
*
*/
#include "EXTERN.h"
#include "perl.h"
#if defined(HAS_MSG) || defined(HAS_SEM) || defined(HAS_SHM)
#include <sys/ipc.h>
#ifdef HAS_MSG
#include <sys/msg.h>
#endif
#ifdef HAS_SEM
#include <sys/sem.h>
#endif
#ifdef HAS_SHM
#include <sys/shm.h>
#endif
#endif
#ifdef I_UTIME
#include <utime.h>
#endif
#ifdef I_FCNTL
#include <fcntl.h>
#endif
#ifdef I_SYS_FILE
#include <sys/file.h>
#endif
bool
do_open(gv,name,len)
GV *gv;
register char *name;
I32 len;
{
FILE *fp;
register IO *io = GvIO(gv);
char *myname = savestr(name);
int result;
int fd;
int writing = 0;
char mode[3]; /* stdio file mode ("r\0" or "r+\0") */
FILE *saveifp = Nullfp;
FILE *saveofp = Nullfp;
char savetype = ' ';
mode[0] = mode[1] = mode[2] = '\0';
name = myname;
forkprocess = 1; /* assume true if no fork */
while (len && isSPACE(name[len-1]))
name[--len] = '\0';
if (!io)
io = GvIO(gv) = newIO();
else if (io->ifp) {
fd = fileno(io->ifp);
if (io->type == '-')
result = 0;
else if (fd <= maxsysfd) {
saveifp = io->ifp;
saveofp = io->ofp;
savetype = io->type;
result = 0;
}
else if (io->type == '|')
result = my_pclose(io->ifp);
else if (io->ifp != io->ofp) {
if (io->ofp) {
result = fclose(io->ofp);
fclose(io->ifp); /* clear stdio, fd already closed */
}
else
result = fclose(io->ifp);
}
else
result = fclose(io->ifp);
if (result == EOF && fd > maxsysfd)
fprintf(stderr,"Warning: unable to close filehandle %s properly.\n",
GvENAME(gv));
io->ofp = io->ifp = Nullfp;
}
if (*name == '+' && len > 1 && name[len-1] != '|') { /* scary */
mode[1] = *name++;
mode[2] = '\0';
--len;
writing = 1;
}
else {
mode[1] = '\0';
}
io->type = *name;
if (*name == '|') {
/*SUPPRESS 530*/
for (name++; isSPACE(*name); name++) ;
if (strNE(name,"-"))
TAINT_ENV();
TAINT_PROPER("piped open");
fp = my_popen(name,"w");
writing = 1;
}
else if (*name == '>') {
TAINT_PROPER("open");
name++;
if (*name == '>') {
mode[0] = io->type = 'a';
name++;
}
else
mode[0] = 'w';
writing = 1;
if (*name == '&') {
duplicity:
name++;
while (isSPACE(*name))
name++;
if (isDIGIT(*name))
fd = atoi(name);
else {
gv = gv_fetchpv(name,FALSE);
if (!gv || !GvIO(gv)) {
#ifdef EINVAL
errno = EINVAL;
#endif
goto say_false;
}
if (GvIO(gv) && GvIO(gv)->ifp) {
fd = fileno(GvIO(gv)->ifp);
if (GvIO(gv)->type == 's')
io->type = 's';
}
else
fd = -1;
}
if (!(fp = fdopen(fd = dup(fd),mode))) {
close(fd);
}
}
else {
while (isSPACE(*name))
name++;
if (strEQ(name,"-")) {
fp = stdout;
io->type = '-';
}
else {
fp = fopen(name,mode);
}
}
}
else {
if (*name == '<') {
mode[0] = 'r';
name++;
while (isSPACE(*name))
name++;
if (*name == '&')
goto duplicity;
if (strEQ(name,"-")) {
fp = stdin;
io->type = '-';
}
else
fp = fopen(name,mode);
}
else if (name[len-1] == '|') {
name[--len] = '\0';
while (len && isSPACE(name[len-1]))
name[--len] = '\0';
/*SUPPRESS 530*/
for (; isSPACE(*name); name++) ;
if (strNE(name,"-"))
TAINT_ENV();
TAINT_PROPER("piped open");
fp = my_popen(name,"r");
io->type = '|';
}
else {
io->type = '<';
/*SUPPRESS 530*/
for (; isSPACE(*name); name++) ;
if (strEQ(name,"-")) {
fp = stdin;
io->type = '-';
}
else
fp = fopen(name,"r");
}
}
if (!fp) {
if (dowarn && io->type == '<' && index(name, '\n'))
warn(warn_nl, "open");
Safefree(myname);
goto say_false;
}
Safefree(myname);
if (io->type &&
io->type != '|' && io->type != '-') {
if (fstat(fileno(fp),&statbuf) < 0) {
(void)fclose(fp);
goto say_false;
}
if (S_ISSOCK(statbuf.st_mode))
io->type = 's'; /* in case a socket was passed in to us */
#ifdef HAS_SOCKET
else if (
#ifdef S_IFMT
!(statbuf.st_mode & S_IFMT)
#else
!statbuf.st_mode
#endif
) {
I32 buflen = sizeof tokenbuf;
if (getsockname(fileno(fp), tokenbuf, &buflen) >= 0
|| errno != ENOTSOCK)
io->type = 's'; /* some OS's return 0 on fstat()ed socket */
/* but some return 0 for streams too, sigh */
}
#endif
}
if (saveifp) { /* must use old fp? */
fd = fileno(saveifp);
if (saveofp) {
fflush(saveofp); /* emulate fclose() */
if (saveofp != saveifp) { /* was a socket? */
fclose(saveofp);
if (fd > 2)
Safefree(saveofp);
}
}
if (fd != fileno(fp)) {
int pid;
SV *sv;
dup2(fileno(fp), fd);
sv = *av_fetch(fdpid,fileno(fp),TRUE);
SvUPGRADE(sv, SVt_IV);
pid = SvIV(sv);
SvIV(sv) = 0;
sv = *av_fetch(fdpid,fd,TRUE);
SvUPGRADE(sv, SVt_IV);
SvIV(sv) = pid;
fclose(fp);
}
fp = saveifp;
clearerr(fp);
}
#if defined(HAS_FCNTL) && defined(FFt_SETFD)
fd = fileno(fp);
fcntl(fd,FFt_SETFD,fd > maxsysfd);
#endif
io->ifp = fp;
if (writing) {
if (io->type == 's'
|| (io->type == '>' && S_ISCHR(statbuf.st_mode)) ) {
if (!(io->ofp = fdopen(fileno(fp),"w"))) {
fclose(fp);
io->ifp = Nullfp;
goto say_false;
}
}
else
io->ofp = fp;
}
return TRUE;
say_false:
io->ifp = saveifp;
io->ofp = saveofp;
io->type = savetype;
return FALSE;
}
FILE *
nextargv(gv)
register GV *gv;
{
register SV *sv;
#ifndef FLEXFILENAMES
int filedev;
int fileino;
#endif
int fileuid;
int filegid;
if (!argvoutgv)
argvoutgv = gv_fetchpv("ARGVOUT",TRUE);
if (filemode & (S_ISUID|S_ISGID)) {
fflush(GvIO(argvoutgv)->ifp); /* chmod must follow last write */
#ifdef HAS_FCHMOD
(void)fchmod(lastfd,filemode);
#else
(void)chmod(oldname,filemode);
#endif
}
filemode = 0;
while (av_len(GvAV(gv)) >= 0) {
sv = av_shift(GvAV(gv));
sv_setsv(GvSV(gv),sv);
SvSETMAGIC(GvSV(gv));
oldname = SvPVnx(GvSV(gv));
if (do_open(gv,oldname,SvCUR(GvSV(gv)))) {
if (inplace) {
TAINT_PROPER("inplace open");
if (strEQ(oldname,"-")) {
sv_free(sv);
defoutgv = gv_fetchpv("STDOUT",TRUE);
return GvIO(gv)->ifp;
}
#ifndef FLEXFILENAMES
filedev = statbuf.st_dev;
fileino = statbuf.st_ino;
#endif
filemode = statbuf.st_mode;
fileuid = statbuf.st_uid;
filegid = statbuf.st_gid;
if (!S_ISREG(filemode)) {
warn("Can't do inplace edit: %s is not a regular file",
oldname );
do_close(gv,FALSE);
sv_free(sv);
continue;
}
if (*inplace) {
#ifdef SUFFIX
add_suffix(sv,inplace);
#else
sv_catpv(sv,inplace);
#endif
#ifndef FLEXFILENAMES
if (stat(SvPV(sv),&statbuf) >= 0
&& statbuf.st_dev == filedev
&& statbuf.st_ino == fileino ) {
warn("Can't do inplace edit: %s > 14 characters",
SvPV(sv) );
do_close(gv,FALSE);
sv_free(sv);
continue;
}
#endif
#ifdef HAS_RENAME
#ifndef DOSISH
if (rename(oldname,SvPV(sv)) < 0) {
warn("Can't rename %s to %s: %s, skipping file",
oldname, SvPV(sv), strerror(errno) );
do_close(gv,FALSE);
sv_free(sv);
continue;
}
#else
do_close(gv,FALSE);
(void)unlink(SvPV(sv));
(void)rename(oldname,SvPV(sv));
do_open(gv,SvPV(sv),SvCUR(GvSV(gv)));
#endif /* MSDOS */
#else
(void)UNLINK(SvPV(sv));
if (link(oldname,SvPV(sv)) < 0) {
warn("Can't rename %s to %s: %s, skipping file",
oldname, SvPV(sv), strerror(errno) );
do_close(gv,FALSE);
sv_free(sv);
continue;
}
(void)UNLINK(oldname);
#endif
}
else {
#ifndef DOSISH
if (UNLINK(oldname) < 0) {
warn("Can't rename %s to %s: %s, skipping file",
oldname, SvPV(sv), strerror(errno) );
do_close(gv,FALSE);
sv_free(sv);
continue;
}
#else
fatal("Can't do inplace edit without backup");
#endif
}
sv_setpvn(sv,">",1);
sv_catpv(sv,oldname);
errno = 0; /* in case sprintf set errno */
if (!do_open(argvoutgv,SvPV(sv),SvCUR(sv))) {
warn("Can't do inplace edit on %s: %s",
oldname, strerror(errno) );
do_close(gv,FALSE);
sv_free(sv);
continue;
}
defoutgv = argvoutgv;
lastfd = fileno(GvIO(argvoutgv)->ifp);
(void)fstat(lastfd,&statbuf);
#ifdef HAS_FCHMOD
(void)fchmod(lastfd,filemode);
#else
(void)chmod(oldname,filemode);
#endif
if (fileuid != statbuf.st_uid || filegid != statbuf.st_gid) {
#ifdef HAS_FCHOWN
(void)fchown(lastfd,fileuid,filegid);
#else
#ifdef HAS_CHOWN
(void)chown(oldname,fileuid,filegid);
#endif
#endif
}
}
sv_free(sv);
return GvIO(gv)->ifp;
}
else
fprintf(stderr,"Can't open %s: %s\n",SvPVn(sv), strerror(errno));
sv_free(sv);
}
if (inplace) {
(void)do_close(argvoutgv,FALSE);
defoutgv = gv_fetchpv("STDOUT",TRUE);
}
return Nullfp;
}
#ifdef HAS_PIPE
void
do_pipe(sv, rgv, wgv)
SV *sv;
GV *rgv;
GV *wgv;
{
register IO *rstio;
register IO *wstio;
int fd[2];
if (!rgv)
goto badexit;
if (!wgv)
goto badexit;
rstio = GvIO(rgv);
wstio = GvIO(wgv);
if (!rstio)
rstio = GvIO(rgv) = newIO();
else if (rstio->ifp)
do_close(rgv,FALSE);
if (!wstio)
wstio = GvIO(wgv) = newIO();
else if (wstio->ifp)
do_close(wgv,FALSE);
if (pipe(fd) < 0)
goto badexit;
rstio->ifp = fdopen(fd[0], "r");
wstio->ofp = fdopen(fd[1], "w");
wstio->ifp = wstio->ofp;
rstio->type = '<';
wstio->type = '>';
if (!rstio->ifp || !wstio->ofp) {
if (rstio->ifp) fclose(rstio->ifp);
else close(fd[0]);
if (wstio->ofp) fclose(wstio->ofp);
else close(fd[1]);
goto badexit;
}
sv_setsv(sv,&sv_yes);
return;
badexit:
sv_setsv(sv,&sv_undef);
return;
}
#endif
bool
do_close(gv,explicit)
GV *gv;
bool explicit;
{
bool retval = FALSE;
register IO *io;
int status;
if (!gv)
gv = argvgv;
if (!gv) {
errno = EBADF;
return FALSE;
}
io = GvIO(gv);
if (!io) { /* never opened */
if (dowarn && explicit)
warn("Close on unopened file <%s>",GvENAME(gv));
return FALSE;
}
if (io->ifp) {
if (io->type == '|') {
status = my_pclose(io->ifp);
retval = (status == 0);
statusvalue = (unsigned short)status & 0xffff;
}
else if (io->type == '-')
retval = TRUE;
else {
if (io->ofp && io->ofp != io->ifp) { /* a socket */
retval = (fclose(io->ofp) != EOF);
fclose(io->ifp); /* clear stdio, fd already closed */
}
else
retval = (fclose(io->ifp) != EOF);
}
io->ofp = io->ifp = Nullfp;
}
if (explicit) {
io->lines = 0;
io->page = 0;
io->lines_left = io->page_len;
}
io->type = ' ';
return retval;
}
bool
do_eof(gv)
GV *gv;
{
register IO *io;
int ch;
io = GvIO(gv);
if (!io)
return TRUE;
while (io->ifp) {
#ifdef STDSTDIO /* (the code works without this) */
if (io->ifp->_cnt > 0) /* cheat a little, since */
return FALSE; /* this is the most usual case */
#endif
ch = getc(io->ifp);
if (ch != EOF) {
(void)ungetc(ch, io->ifp);
return FALSE;
}
#ifdef STDSTDIO
if (io->ifp->_cnt < -1)
io->ifp->_cnt = -1;
#endif
if (gv == argvgv) { /* not necessarily a real EOF yet? */
if (!nextargv(argvgv)) /* get another fp handy */
return TRUE;
}
else
return TRUE; /* normal fp, definitely end of file */
}
return TRUE;
}
long
do_tell(gv)
GV *gv;
{
register IO *io;
if (!gv)
goto phooey;
io = GvIO(gv);
if (!io || !io->ifp)
goto phooey;
#ifdef ULTRIX_STDIO_BOTCH
if (feof(io->ifp))
(void)fseek (io->ifp, 0L, 2); /* ultrix 1.2 workaround */
#endif
return ftell(io->ifp);
phooey:
if (dowarn)
warn("tell() on unopened file");
errno = EBADF;
return -1L;
}
bool
do_seek(gv, pos, whence)
GV *gv;
long pos;
int whence;
{
register IO *io;
if (!gv)
goto nuts;
io = GvIO(gv);
if (!io || !io->ifp)
goto nuts;
#ifdef ULTRIX_STDIO_BOTCH
if (feof(io->ifp))
(void)fseek (io->ifp, 0L, 2); /* ultrix 1.2 workaround */
#endif
return fseek(io->ifp, pos, whence) >= 0;
nuts:
if (dowarn)
warn("seek() on unopened file");
errno = EBADF;
return FALSE;
}
I32
do_ctl(optype,gv,func,argstr)
I32 optype;
GV *gv;
I32 func;
SV *argstr;
{
register IO *io;
register char *s;
I32 retval;
if (!gv || !argstr || !(io = GvIO(gv)) || !io->ifp) {
errno = EBADF; /* well, sort of... */
return -1;
}
if (SvPOK(argstr) || !SvNIOK(argstr)) {
if (!SvPOK(argstr))
s = SvPVn(argstr);
#ifdef IOCPARM_MASK
#ifndef IOCPARM_LEN
#define IOCPARM_LEN(x) (((x) >> 16) & IOCPARM_MASK)
#endif
#endif
#ifdef IOCPARM_LEN
retval = IOCPARM_LEN(func); /* on BSDish systes we're safe */
#else
retval = 256; /* otherwise guess at what's safe */
#endif
if (SvCUR(argstr) < retval) {
Sv_Grow(argstr,retval+1);
SvCUR_set(argstr, retval);
}
s = SvPV(argstr);
s[SvCUR(argstr)] = 17; /* a little sanity check here */
}
else {
retval = SvIVn(argstr);
#ifdef DOSISH
s = (char*)(long)retval; /* ouch */
#else
s = (char*)retval; /* ouch */
#endif
}
#ifndef lint
if (optype == OP_IOCTL)
retval = ioctl(fileno(io->ifp), func, s);
else
#ifdef DOSISH
fatal("fcntl is not implemented");
#else
#ifdef HAS_FCNTL
retval = fcntl(fileno(io->ifp), func, s);
#else
fatal("fcntl is not implemented");
#endif
#endif
#else /* lint */
retval = 0;
#endif /* lint */
if (SvPOK(argstr)) {
if (s[SvCUR(argstr)] != 17)
fatal("Return value overflowed string");
s[SvCUR(argstr)] = 0; /* put our null back */
}
return retval;
}
#if !defined(HAS_TRUNCATE) && !defined(HAS_CHSIZE) && defined(FFt_FREESP)
/* code courtesy of William Kucharski */
#define HAS_CHSIZE
I32 chsize(fd, length)
I32 fd; /* file descriptor */
off_t length; /* length to set file to */
{
extern long lseek();
struct flock fl;
struct stat filebuf;
if (fstat(fd, &filebuf) < 0)
return -1;
if (filebuf.st_size < length) {
/* extend file length */
if ((lseek(fd, (length - 1), 0)) < 0)
return -1;
/* write a "0" byte */
if ((write(fd, "", 1)) != 1)
return -1;
}
else {
/* truncate length */
fl.l_whence = 0;
fl.l_len = 0;
fl.l_start = length;
fl.l_type = FFt_WRLCK; /* write lock on file space */
/*
* This relies on the UNDOCUMENTED FFt_FREESP argument to
* fcntl(2), which truncates the file so that it ends at the
* position indicated by fl.l_start.
*
* Will minor miracles never cease?
*/
if (fcntl(fd, FFt_FREESP, &fl) < 0)
return -1;
}
return 0;
}
#endif /* FFt_FREESP */
I32
looks_like_number(sv)
SV *sv;
{
register char *s;
register char *send;
if (!SvPOK(sv))
return TRUE;
s = SvPV(sv);
send = s + SvCUR(sv);
while (isSPACE(*s))
s++;
if (s >= send)
return FALSE;
if (*s == '+' || *s == '-')
s++;
while (isDIGIT(*s))
s++;
if (s == send)
return TRUE;
if (*s == '.')
s++;
else if (s == SvPV(sv))
return FALSE;
while (isDIGIT(*s))
s++;
if (s == send)
return TRUE;
if (*s == 'e' || *s == 'E') {
s++;
if (*s == '+' || *s == '-')
s++;
while (isDIGIT(*s))
s++;
}
while (isSPACE(*s))
s++;
if (s >= send)
return TRUE;
return FALSE;
}
bool
do_print(sv,fp)
register SV *sv;
FILE *fp;
{
register char *tmps;
SV* tmpstr;
/* assuming fp is checked earlier */
if (!sv)
return TRUE;
if (ofmt) {
if (SvMAGICAL(sv))
mg_get(sv);
if (SvIOK(sv) && SvIV(sv) != 0) {
fprintf(fp, ofmt, (double)SvIV(sv));
return !ferror(fp);
}
if ( (SvNOK(sv) && SvNV(sv) != 0.0)
|| (looks_like_number(sv) && sv_2nv(sv) != 0.0) ) {
fprintf(fp, ofmt, SvNV(sv));
return !ferror(fp);
}
}
switch (SvTYPE(sv)) {
case SVt_NULL:
return TRUE;
case SVt_REF:
fprintf(fp, "%s", sv_2pv(sv));
return !ferror(fp);
case SVt_IV:
if (SvMAGICAL(sv))
mg_get(sv);
fprintf(fp, "%d", SvIV(sv));
return !ferror(fp);
default:
tmps = SvPVn(sv);
break;
}
if (SvCUR(sv) && (fwrite(tmps,1,SvCUR(sv),fp) == 0 || ferror(fp)))
return FALSE;
return TRUE;
}
I32
my_stat(ARGS)
dARGS
{
dSP;
IO *io;
if (op->op_flags & OPf_SPECIAL) {
EXTEND(sp,1);
io = GvIO(cGVOP->op_gv);
if (io && io->ifp) {
statgv = cGVOP->op_gv;
sv_setpv(statname,"");
laststype = OP_STAT;
return (laststatval = fstat(fileno(io->ifp), &statcache));
}
else {
if (cGVOP->op_gv == defgv)
return laststatval;
if (dowarn)
warn("Stat on unopened file <%s>",
GvENAME(cGVOP->op_gv));
statgv = Nullgv;
sv_setpv(statname,"");
return (laststatval = -1);
}
}
else {
dPOPss;
PUTBACK;
statgv = Nullgv;
sv_setpv(statname,SvPVn(sv));
laststype = OP_STAT;
laststatval = stat(SvPVn(sv),&statcache);
if (laststatval < 0 && dowarn && index(SvPVn(sv), '\n'))
warn(warn_nl, "stat");
return laststatval;
}
}
I32
my_lstat(ARGS)
dARGS
{
dSP;
SV *sv;
if (op->op_flags & OPf_SPECIAL) {
EXTEND(sp,1);
if (cGVOP->op_gv == defgv) {
if (laststype != OP_LSTAT)
fatal("The stat preceding -l _ wasn't an lstat");
return laststatval;
}
fatal("You can't use -l on a filehandle");
}
laststype = OP_LSTAT;
statgv = Nullgv;
sv = POPs;
PUTBACK;
sv_setpv(statname,SvPVn(sv));
#ifdef HAS_LSTAT
laststatval = lstat(SvPVn(sv),&statcache);
#else
laststatval = stat(SvPVn(sv),&statcache);
#endif
if (laststatval < 0 && dowarn && index(SvPVn(sv), '\n'))
warn(warn_nl, "lstat");
return laststatval;
}
bool
do_aexec(really,mark,sp)
SV *really;
register SV **mark;
register SV **sp;
{
register char **a;
char *tmps;
if (sp > mark) {
New(401,Argv, sp - mark + 1, char*);
a = Argv;
while (++mark <= sp) {
if (*mark)
*a++ = SvPVnx(*mark);
else
*a++ = "";
}
*a = Nullch;
if (*Argv[0] != '/') /* will execvp use PATH? */
TAINT_ENV(); /* testing IFS here is overkill, probably */
if (really && *(tmps = SvPVn(really)))
execvp(tmps,Argv);
else
execvp(Argv[0],Argv);
}
do_execfree();
return FALSE;
}
void
do_execfree()
{
if (Argv) {
Safefree(Argv);
Argv = Null(char **);
}
if (Cmd) {
Safefree(Cmd);
Cmd = Nullch;
}
}
bool
do_exec(cmd)
char *cmd;
{
register char **a;
register char *s;
char flags[10];
/* save an extra exec if possible */
#ifdef CSH
if (strnEQ(cmd,cshname,cshlen) && strnEQ(cmd+cshlen," -c",3)) {
strcpy(flags,"-c");
s = cmd+cshlen+3;
if (*s == 'f') {
s++;
strcat(flags,"f");
}
if (*s == ' ')
s++;
if (*s++ == '\'') {
char *ncmd = s;
while (*s)
s++;
if (s[-1] == '\n')
*--s = '\0';
if (s[-1] == '\'') {
*--s = '\0';
execl(cshname,"csh", flags,ncmd,(char*)0);
*s = '\'';
return FALSE;
}
}
}
#endif /* CSH */
/* see if there are shell metacharacters in it */
/*SUPPRESS 530*/
for (s = cmd; *s && isALPHA(*s); s++) ; /* catch VAR=val gizmo */
if (*s == '=')
goto doshell;
for (s = cmd; *s; s++) {
if (*s != ' ' && !isALPHA(*s) && index("$&*(){}[]'\";\\|?<>~`\n",*s)) {
if (*s == '\n' && !s[1]) {
*s = '\0';
break;
}
doshell:
execl("/bin/sh","sh","-c",cmd,(char*)0);
return FALSE;
}
}
New(402,Argv, (s - cmd) / 2 + 2, char*);
Cmd = nsavestr(cmd, s-cmd);
a = Argv;
for (s = Cmd; *s;) {
while (*s && isSPACE(*s)) s++;
if (*s)
*(a++) = s;
while (*s && !isSPACE(*s)) s++;
if (*s)
*s++ = '\0';
}
*a = Nullch;
if (Argv[0]) {
execvp(Argv[0],Argv);
if (errno == ENOEXEC) { /* for system V NIH syndrome */
do_execfree();
goto doshell;
}
}
do_execfree();
return FALSE;
}
I32
apply(type,mark,sp)
I32 type;
register SV **mark;
register SV **sp;
{
register I32 val;
register I32 val2;
register I32 tot = 0;
char *s;
SV **oldmark = mark;
#ifdef TAINT
while (++mark <= sp)
TAINT_IF((*mark)->sv_tainted);
mark = oldmark;
#endif
switch (type) {
case OP_CHMOD:
TAINT_PROPER("chmod");
if (++mark <= sp) {
tot = sp - mark;
val = SvIVnx(*mark);
while (++mark <= sp) {
if (chmod(SvPVnx(*mark),val))
tot--;
}
}
break;
#ifdef HAS_CHOWN
case OP_CHOWN:
TAINT_PROPER("chown");
if (sp - mark > 2) {
tot = sp - mark;
val = SvIVnx(*++mark);
val2 = SvIVnx(*++mark);
while (++mark <= sp) {
if (chown(SvPVnx(*mark),val,val2))
tot--;
}
}
break;
#endif
#ifdef HAS_KILL
case OP_KILL:
TAINT_PROPER("kill");
s = SvPVnx(*++mark);
tot = sp - mark;
if (isUPPER(*s)) {
if (*s == 'S' && s[1] == 'I' && s[2] == 'G')
s += 3;
if (!(val = whichsig(s)))
fatal("Unrecognized signal name \"%s\"",s);
}
else
val = SvIVnx(*mark);
if (val < 0) {
val = -val;
while (++mark <= sp) {
I32 proc = SvIVnx(*mark);
#ifdef HAS_KILLPG
if (killpg(proc,val)) /* BSD */
#else
if (kill(-proc,val)) /* SYSV */
#endif
tot--;
}
}
else {
while (++mark <= sp) {
if (kill(SvIVnx(*mark),val))
tot--;
}
}
break;
#endif
case OP_UNLINK:
TAINT_PROPER("unlink");
tot = sp - mark;
while (++mark <= sp) {
s = SvPVnx(*mark);
if (euid || unsafe) {
if (UNLINK(s))
tot--;
}
else { /* don't let root wipe out directories without -U */
#ifdef HAS_LSTAT
if (lstat(s,&statbuf) < 0 || S_ISDIR(statbuf.st_mode))
#else
if (stat(s,&statbuf) < 0 || S_ISDIR(statbuf.st_mode))
#endif
tot--;
else {
if (UNLINK(s))
tot--;
}
}
}
break;
case OP_UTIME:
TAINT_PROPER("utime");
if (sp - mark > 2) {
#ifdef I_UTIME
struct utimbuf utbuf;
#else
struct {
long actime;
long modtime;
} utbuf;
#endif
Zero(&utbuf, sizeof utbuf, char);
utbuf.actime = SvIVnx(*++mark); /* time accessed */
utbuf.modtime = SvIVnx(*++mark); /* time modified */
tot = sp - mark;
while (++mark <= sp) {
if (utime(SvPVnx(*mark),&utbuf))
tot--;
}
}
else
tot = 0;
break;
}
return tot;
}
/* Do the permissions allow some operation? Assumes statcache already set. */
I32
cando(bit, effective, statbufp)
I32 bit;
I32 effective;
register struct stat *statbufp;
{
#ifdef DOSISH
/* [Comments and code from Len Reed]
* MS-DOS "user" is similar to UNIX's "superuser," but can't write
* to write-protected files. The execute permission bit is set
* by the Miscrosoft C library stat() function for the following:
* .exe files
* .com files
* .bat files
* directories
* All files and directories are readable.
* Directories and special files, e.g. "CON", cannot be
* write-protected.
* [Comment by Tom Dinger -- a directory can have the write-protect
* bit set in the file system, but DOS permits changes to
* the directory anyway. In addition, all bets are off
* here for networked software, such as Novell and
* Sun's PC-NFS.]
*/
/* Atari stat() does pretty much the same thing. we set x_bit_set_in_stat
* too so it will actually look into the files for magic numbers
*/
return (bit & statbufp->st_mode) ? TRUE : FALSE;
#else /* ! MSDOS */
if ((effective ? euid : uid) == 0) { /* root is special */
if (bit == S_IXUSR) {
if (statbufp->st_mode & 0111 || S_ISDIR(statbufp->st_mode))
return TRUE;
}
else
return TRUE; /* root reads and writes anything */
return FALSE;
}
if (statbufp->st_uid == (effective ? euid : uid) ) {
if (statbufp->st_mode & bit)
return TRUE; /* ok as "user" */
}
else if (ingroup((I32)statbufp->st_gid,effective)) {
if (statbufp->st_mode & bit >> 3)
return TRUE; /* ok as "group" */
}
else if (statbufp->st_mode & bit >> 6)
return TRUE; /* ok as "other" */
return FALSE;
#endif /* ! MSDOS */
}
I32
ingroup(testgid,effective)
I32 testgid;
I32 effective;
{
if (testgid == (effective ? egid : gid))
return TRUE;
#ifdef HAS_GETGROUPS
#ifndef NGROUPS
#define NGROUPS 32
#endif
{
GROUPSTYPE gary[NGROUPS];
I32 anum;
anum = getgroups(NGROUPS,gary);
while (--anum >= 0)
if (gary[anum] == testgid)
return TRUE;
}
#endif
return FALSE;
}
#if defined(HAS_MSG) || defined(HAS_SEM) || defined(HAS_SHM)
I32
do_ipcget(optype, mark, sp)
I32 optype;
SV **mark;
SV **sp;
{
key_t key;
I32 n, flags;
key = (key_t)SvNVnx(*++mark);
n = (optype == OP_MSGGET) ? 0 : SvIVnx(*++mark);
flags = SvIVnx(*++mark);
errno = 0;
switch (optype)
{
#ifdef HAS_MSG
case OP_MSGGET:
return msgget(key, flags);
#endif
#ifdef HAS_SEM
case OP_SEMGET:
return semget(key, n, flags);
#endif
#ifdef HAS_SHM
case OP_SHMGET:
return shmget(key, n, flags);
#endif
#if !defined(HAS_MSG) || !defined(HAS_SEM) || !defined(HAS_SHM)
default:
fatal("%s not implemented", op_name[optype]);
#endif
}
return -1; /* should never happen */
}
I32
do_ipcctl(optype, mark, sp)
I32 optype;
SV **mark;
SV **sp;
{
SV *astr;
char *a;
I32 id, n, cmd, infosize, getinfo, ret;
id = SvIVnx(*++mark);
n = (optype == OP_SEMCTL) ? SvIVnx(*++mark) : 0;
cmd = SvIVnx(*++mark);
astr = *++mark;
infosize = 0;
getinfo = (cmd == IPC_STAT);
switch (optype)
{
#ifdef HAS_MSG
case OP_MSGCTL:
if (cmd == IPC_STAT || cmd == IPC_SET)
infosize = sizeof(struct msqid_ds);
break;
#endif
#ifdef HAS_SHM
case OP_SHMCTL:
if (cmd == IPC_STAT || cmd == IPC_SET)
infosize = sizeof(struct shmid_ds);
break;
#endif
#ifdef HAS_SEM
case OP_SEMCTL:
if (cmd == IPC_STAT || cmd == IPC_SET)
infosize = sizeof(struct semid_ds);
else if (cmd == GETALL || cmd == SETALL)
{
struct semid_ds semds;
if (semctl(id, 0, IPC_STAT, &semds) == -1)
return -1;
getinfo = (cmd == GETALL);
infosize = semds.sem_nsems * sizeof(short);
/* "short" is technically wrong but much more portable
than guessing about u_?short(_t)? */
}
break;
#endif
#if !defined(HAS_MSG) || !defined(HAS_SEM) || !defined(HAS_SHM)
default:
fatal("%s not implemented", op_name[optype]);
#endif
}
if (infosize)
{
if (getinfo)
{
SvGROW(astr, infosize+1);
a = SvPVn(astr);
}
else
{
a = SvPVn(astr);
if (SvCUR(astr) != infosize)
{
errno = EINVAL;
return -1;
}
}
}
else
{
I32 i = SvIVn(astr);
a = (char *)i; /* ouch */
}
errno = 0;
switch (optype)
{
#ifdef HAS_MSG
case OP_MSGCTL:
ret = msgctl(id, cmd, (struct msqid_ds *)a);
break;
#endif
#ifdef HAS_SEM
case OP_SEMCTL:
ret = semctl(id, n, cmd, (struct semid_ds *)a);
break;
#endif
#ifdef HAS_SHM
case OP_SHMCTL:
ret = shmctl(id, cmd, (struct shmid_ds *)a);
break;
#endif
}
if (getinfo && ret >= 0) {
SvCUR_set(astr, infosize);
*SvEND(astr) = '\0';
}
return ret;
}
I32
do_msgsnd(mark, sp)
SV **mark;
SV **sp;
{
#ifdef HAS_MSG
SV *mstr;
char *mbuf;
I32 id, msize, flags;
id = SvIVnx(*++mark);
mstr = *++mark;
flags = SvIVnx(*++mark);
mbuf = SvPVn(mstr);
if ((msize = SvCUR(mstr) - sizeof(long)) < 0) {
errno = EINVAL;
return -1;
}
errno = 0;
return msgsnd(id, (struct msgbuf *)mbuf, msize, flags);
#else
fatal("msgsnd not implemented");
#endif
}
I32
do_msgrcv(mark, sp)
SV **mark;
SV **sp;
{
#ifdef HAS_MSG
SV *mstr;
char *mbuf;
long mtype;
I32 id, msize, flags, ret;
id = SvIVnx(*++mark);
mstr = *++mark;
msize = SvIVnx(*++mark);
mtype = (long)SvIVnx(*++mark);
flags = SvIVnx(*++mark);
mbuf = SvPVn(mstr);
if (SvCUR(mstr) < sizeof(long)+msize+1) {
SvGROW(mstr, sizeof(long)+msize+1);
mbuf = SvPVn(mstr);
}
errno = 0;
ret = msgrcv(id, (struct msgbuf *)mbuf, msize, mtype, flags);
if (ret >= 0) {
SvCUR_set(mstr, sizeof(long)+ret);
*SvEND(mstr) = '\0';
}
return ret;
#else
fatal("msgrcv not implemented");
#endif
}
I32
do_semop(mark, sp)
SV **mark;
SV **sp;
{
#ifdef HAS_SEM
SV *opstr;
char *opbuf;
I32 id, opsize;
id = SvIVnx(*++mark);
opstr = *++mark;
opbuf = SvPVn(opstr);
opsize = SvCUR(opstr);
if (opsize < sizeof(struct sembuf)
|| (opsize % sizeof(struct sembuf)) != 0) {
errno = EINVAL;
return -1;
}
errno = 0;
return semop(id, (struct sembuf *)opbuf, opsize/sizeof(struct sembuf));
#else
fatal("semop not implemented");
#endif
}
I32
do_shmio(optype, mark, sp)
I32 optype;
SV **mark;
SV **sp;
{
#ifdef HAS_SHM
SV *mstr;
char *mbuf, *shm;
I32 id, mpos, msize;
struct shmid_ds shmds;
#ifndef VOIDSHMAT
extern char *shmat();
#endif
id = SvIVnx(*++mark);
mstr = *++mark;
mpos = SvIVnx(*++mark);
msize = SvIVnx(*++mark);
errno = 0;
if (shmctl(id, IPC_STAT, &shmds) == -1)
return -1;
if (mpos < 0 || msize < 0 || mpos + msize > shmds.shm_segsz) {
errno = EFAULT; /* can't do as caller requested */
return -1;
}
shm = (char*)shmat(id, (char*)NULL, (optype == OP_SHMREAD) ? SHM_RDONLY : 0);
if (shm == (char *)-1) /* I hate System V IPC, I really do */
return -1;
mbuf = SvPVn(mstr);
if (optype == OP_SHMREAD) {
if (SvCUR(mstr) < msize) {
SvGROW(mstr, msize+1);
mbuf = SvPVn(mstr);
}
Copy(shm + mpos, mbuf, msize, char);
SvCUR_set(mstr, msize);
*SvEND(mstr) = '\0';
}
else {
I32 n;
if ((n = SvCUR(mstr)) > msize)
n = msize;
Copy(mbuf, shm + mpos, n, char);
if (n < msize)
memzero(shm + mpos + n, msize - n);
}
return shmdt(shm);
#else
fatal("shm I/O not implemented");
#endif
}
#endif /* SYSV IPC */
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