* 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.
* %sccs.include.redist.c%
static char sccsid
[] = "@(#)popen.c 5.9 (Berkeley) %G%";
* 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
);