* Copyright (c) 1988 The Regents of the University of California.
* This code is derived from software written by Ken Arnold and
* published in UNIX Review, Vol. 6, No. 8.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
static char sccsid
[] = "@(#)popen.c 5.9 (Berkeley) 2/25/91";
* Special version of popen which avoids call to shell. This insures noone
* may create a pipe to a hidden program as a side effect of a list or dir
ftpd_popen(program
, type
)
int argc
, gargc
, pdes
[2], pid
;
char **pop
, *argv
[100], *gargv
[1000], *vv
[2];
extern char **ftpglob(), **copyblk();
if (*type
!= 'r' && *type
!= 'w' || type
[1])
if ((fds
= getdtablesize()) <= 0)
if ((pids
= (int *)malloc((u_int
)(fds
* sizeof(int)))) == NULL
)
bzero((char *)pids
, fds
* sizeof(int));
/* break up string into pieces */
for (argc
= 0, cp
= program
;; cp
= NULL
)
if (!(argv
[argc
++] = strtok(cp
, " \t\n")))
for (gargc
= argc
= 1; argv
[argc
]; argc
++) {
if (!(pop
= ftpglob(argv
[argc
]))) { /* globbing failed */
argv
[argc
] = (char *)pop
; /* save to free later */
while (*pop
&& gargc
< 1000)
dup2(pdes
[1], 2); /* stderr, too! */
/* parent; assume fdopen can't fail... */
iop
= fdopen(pdes
[0], type
);
iop
= fdopen(pdes
[1], type
);
pfree
: for (argc
= 1; argv
[argc
] != NULL
; argc
++) {
blkfree((char **)argv
[argc
]);
free((char *)argv
[argc
]);
* pclose returns -1 if stream is not associated with a
* `popened' command, or, if already `pclosed'.
if (pids
== 0 || pids
[fdes
= fileno(iop
)] == 0)
omask
= sigblock(sigmask(SIGINT
)|sigmask(SIGQUIT
)|sigmask(SIGHUP
));
while ((pid
= wait((int *)&stat_loc
)) != pids
[fdes
] && pid
!= -1);
return(pid
== -1 ? -1 : stat_loc
.w_status
);