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reactos/rosapps/mc/src/utilunix.c
Steven Edwards e5c0c7185e Midnight Commander for Win32 
svn path=/trunk/; revision=2456
2001-12-30 10:02:14 +00:00

933 lines
22 KiB
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/* Various utilities - Unix variants
Copyright (C) 1994, 1995, 1996 the Free Software Foundation.
Written 1994, 1995, 1996 by:
Miguel de Icaza, Janne Kukonlehto, Dugan Porter,
Jakub Jelinek, Mauricio Plaza.
The file_date routine is mostly from GNU's fileutils package,
written by Richard Stallman and David MacKenzie.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <fcntl.h>
#include <signal.h> /* my_system */
#include <limits.h> /* INT_MAX */
#include <sys/time.h> /* select: timeout */
#include <sys/param.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdarg.h>
#ifdef HAVE_SYS_WAIT_H
# include <sys/wait.h> /* my_system */
#endif
#include <errno.h> /* my_system */
#include <pwd.h>
#include <grp.h>
#include <string.h>
#include <ctype.h>
#ifdef HAVE_SYS_SELECT_H
# include <sys/select.h>
#endif
#ifdef SCO_FLAVOR
# include <sys/timeb.h>
#endif
#include <time.h>
#ifdef __linux__
# if defined(__GLIBC__) && (__GLIBC__ < 2)
# include <linux/termios.h> /* This is needed for TIOCLINUX */
# else
# include <termios.h>
# endif
# include <sys/ioctl.h>
#endif
#ifdef __QNX__
# include <unix.h> /* exec*() from <process.h> */
#endif
#include "util.h"
#include "global.h"
#include "fsusage.h"
#include "fsusage.h"
#include "mountlist.h"
#include "mad.h"
#include "dialog.h" /* message() */
#include "../vfs/vfs.h" /* mc_read() */
#include "x.h"
struct sigaction startup_handler;
extern struct mount_entry *mount_list;
uid_t current_user_uid;
user_in_groups *current_user_gid;
int
max_open_files (void)
{
static int files;
if (files)
return files;
#ifdef HAVE_SYSCONF
files = sysconf (_SC_OPEN_MAX);
if (files != -1)
return files;
#endif
#ifdef OPEN_MAX
return files = OPEN_MAX;
#else
return files = 256;
#endif
}
void init_groups (void)
{
int i;
struct passwd *pwd;
struct group *grp;
user_in_groups *cug, *pug;
pwd = getpwuid (current_user_uid=getuid ());
current_user_gid = (pug = xmalloc (sizeof (user_in_groups), "init_groups"));
current_user_gid->gid = getgid (); current_user_gid->next = 0;
if (pwd == 0)
return;
setgrent ();
while ((grp = getgrent ()))
for (i = 0; grp->gr_mem[i]; i++)
if (!strcmp (pwd->pw_name,grp->gr_mem[i]))
{
cug = xmalloc (sizeof (user_in_groups), "init_groups");
cug->gid = grp->gr_gid;
pug->next = cug;
cug->next = 0;
pug = cug;
break;
}
endgrent ();
}
/* Return the index of permission triplet */
int
get_user_rights (struct stat *buf)
{
user_in_groups *cug;
if (buf->st_uid == current_user_uid || current_user_uid == 0)
return 0;
for (cug = current_user_gid; cug; cug = cug->next)
if (cug->gid == buf->st_gid) return 1;
return 2;
}
void
delete_groups (void)
{
user_in_groups *pug, *cug = current_user_gid;
while (cug){
pug = cug->next;
free (cug);
cug = pug;
}
}
#define UID_CACHE_SIZE 200
#define GID_CACHE_SIZE 30
typedef struct {
int index;
char *string;
} int_cache;
int_cache uid_cache [UID_CACHE_SIZE];
int_cache gid_cache [GID_CACHE_SIZE];
void init_uid_gid_cache (void)
{
int i;
for (i = 0; i < UID_CACHE_SIZE; i++)
uid_cache [i].string = 0;
for (i = 0; i < GID_CACHE_SIZE; i++)
gid_cache [i].string = 0;
}
static char *i_cache_match (int id, int_cache *cache, int size)
{
int i;
for (i = 0; i < size; i++)
if (cache [i].index == id)
return cache [i].string;
return 0;
}
static void i_cache_add (int id, int_cache *cache, int size, char *text,
int *last)
{
if (cache [*last].string)
free (cache [*last].string);
cache [*last].string = strdup (text);
cache [*last].index = id;
*last = ((*last)+1) % size;
}
char *get_owner (int uid)
{
struct passwd *pwd;
static char ibuf [8];
char *name;
static int uid_last;
if ((name = i_cache_match (uid, uid_cache, UID_CACHE_SIZE)) != NULL)
return name;
pwd = getpwuid (uid);
if (pwd){
i_cache_add (uid, uid_cache, UID_CACHE_SIZE, pwd->pw_name, &uid_last);
return pwd->pw_name;
}
else {
sprintf (ibuf, "%d", uid);
return ibuf;
}
}
char *get_group (int gid)
{
struct group *grp;
static char gbuf [8];
char *name;
static int gid_last;
if ((name = i_cache_match (gid, gid_cache, GID_CACHE_SIZE)) != NULL)
return name;
grp = getgrgid (gid);
if (grp){
i_cache_add (gid, gid_cache, GID_CACHE_SIZE, grp->gr_name, &gid_last);
return grp->gr_name;
} else {
sprintf (gbuf, "%d", gid);
return gbuf;
}
}
/* Since ncurses uses a handler that automatically refreshes the */
/* screen after a SIGCONT, and we don't want this behavior when */
/* spawning a child, we save the original handler here */
void save_stop_handler (void)
{
sigaction (SIGTSTP, NULL, &startup_handler);
}
#ifdef HAVE_GNOME
#define PORT_HAS_MY_SYSTEM 1
#endif
#ifndef PORT_HAS_MY_SYSTEM
int my_system (int flags, const char *shell, const char *command)
{
struct sigaction ignore, save_intr, save_quit, save_stop;
pid_t pid;
int status = 0;
int as_shell_command = flags & EXECUTE_AS_SHELL;
ignore.sa_handler = SIG_IGN;
sigemptyset (&ignore.sa_mask);
ignore.sa_flags = 0;
sigaction (SIGINT, &ignore, &save_intr);
sigaction (SIGQUIT, &ignore, &save_quit);
/* Restore the original SIGTSTP handler, we don't want ncurses' */
/* handler messing the screen after the SIGCONT */
sigaction (SIGTSTP, &startup_handler, &save_stop);
if ((pid = fork ()) < 0){
fprintf (stderr, "\n\nfork () = -1\n");
return -1;
}
if (pid == 0){
sigaction (SIGINT, &save_intr, NULL);
sigaction (SIGQUIT, &save_quit, NULL);
#if 0
prepare_environment ();
#endif
if (as_shell_command)
execl (shell, shell, "-c", command, (char *) 0);
else
execlp (shell, shell, command, (char *) 0);
_exit (127); /* Exec error */
} else {
while (waitpid (pid, &status, 0) < 0)
if (errno != EINTR){
status = -1;
break;
}
}
sigaction (SIGINT, &save_intr, NULL);
sigaction (SIGQUIT, &save_quit, NULL);
sigaction (SIGTSTP, &save_stop, NULL);
#ifdef SCO_FLAVOR
waitpid(-1, NULL, WNOHANG);
#endif /* SCO_FLAVOR */
return WEXITSTATUS(status);
}
#endif
/* Returns a newly allocated string, if directory does not exist, return 0 */
char *tilde_expand (char *directory)
{
struct passwd *passwd;
char *p;
char *name;
int len;
if (*directory != '~')
return strdup (directory);
directory++;
p = strchr (directory, PATH_SEP);
/* d = "~" or d = "~/" */
if (!(*directory) || (*directory == PATH_SEP)){
passwd = getpwuid (geteuid ());
p = (*directory == PATH_SEP) ? directory+1 : "";
} else {
if (!p){
p = "";
passwd = getpwnam (directory);
} else {
name = xmalloc (p - directory + 1, "tilde_expand");
strncpy (name, directory, p - directory);
name [p - directory] = 0;
passwd = getpwnam (name);
free (name);
}
}
/* If we can't figure the user name, return NULL */
if (!passwd)
return 0;
len = strlen (passwd->pw_dir) + strlen (p) + 2;
directory = xmalloc (len, "tilde_expand");
strcpy (directory, passwd->pw_dir);
strcat (directory, PATH_SEP_STR);
strcat (directory, p);
return directory;
}
int
set_nonblocking (int fd)
{
int val;
val = fcntl (fd, F_GETFL, 0);
val |= O_NONBLOCK;
return fcntl (fd, F_SETFL, val) != -1;
}
/* Pipes are guaranteed to be able to hold at least 4096 bytes */
/* More than that would be unportable */
#define MAX_PIPE_SIZE 4096
static int error_pipe[2]; /* File descriptors of error pipe */
static int old_error; /* File descriptor of old standard error */
/* Creates a pipe to hold standard error for a later analysis. */
/* The pipe can hold 4096 bytes. Make sure no more is written */
/* or a deadlock might occur. */
void open_error_pipe (void)
{
if (pipe (error_pipe) < 0){
message (0, _(" Warning "), _(" Pipe failed "));
}
old_error = dup (2);
if(old_error < 0 || close(2) || dup (error_pipe[1]) != 2){
message (0, _(" Warning "), _(" Dup failed "));
close (error_pipe[0]);
close (error_pipe[1]);
}
close (error_pipe[1]);
}
void close_error_pipe (int error, char *text)
{
char *title;
char msg[MAX_PIPE_SIZE];
int len = 0;
if (error)
title = MSG_ERROR;
else
title = " Warning ";
if (old_error >= 0){
close (2);
dup (old_error);
close (old_error);
len = read (error_pipe[0], msg, MAX_PIPE_SIZE);
if (len >= 0)
msg[len] = 0;
close (error_pipe[0]);
}
if (error < 0)
return; /* Just ignore error message */
if (text == NULL){
if (len == 0) return; /* Nothing to show */
/* Show message from pipe */
message (error, title, msg);
} else {
/* Show given text and possible message from pipe */
message (error, title, " %s \n %s ", text, msg);
}
}
/* Checks for messages in the error pipe,
* closes the pipe and displays an error box if needed
*/
void check_error_pipe (void)
{
char error[MAX_PIPE_SIZE];
int len = 0;
if (old_error >= 0){
while (len < MAX_PIPE_SIZE)
{
fd_set select_set;
struct timeval timeout;
FD_ZERO (&select_set);
FD_SET (error_pipe[0], &select_set);
timeout.tv_sec = 0;
timeout.tv_usec = 0;
select (FD_SETSIZE, &select_set, 0, 0, &timeout);
if (!FD_ISSET (0, &select_set))
break;
read (error_pipe[0], error + len, 1);
len ++;
}
error[len] = 0;
close (error_pipe[0]);
}
if (len > 0)
message (0, _(" Warning "), error);
}
static struct sigaction ignore, save_intr, save_quit, save_stop;
/* INHANDLE is a result of some mc_open call to any vfs, this function
returns a normal handle (to be used with read) of a pipe for reading
of the output of COMMAND with arguments ... (must include argv[0] as
well) which gets as its input at most INLEN bytes from the INHANDLE
using mc_read. You have to call mc_doublepclose to close the returned
handle afterwards. If INLEN is -1, we read as much as we can :) */
int mc_doublepopen (int inhandle, int inlen, pid_t *the_pid, char *command, ...)
{
int pipe0 [2], pipe1 [2];
pid_t pid;
#define closepipes() close(pipe0[0]);close(pipe0[1]);close(pipe1[0]);close(pipe1[1])
#define is_a_pipe_fd(f) ((pipe0[0] == f) || (pipe0[1] == f) || (pipe1[0] == f) || (pipe1[1] == f))
pipe (pipe0); pipe (pipe1);
ignore.sa_handler = SIG_IGN;
sigemptyset (&ignore.sa_mask);
ignore.sa_flags = 0;
sigaction (SIGINT, &ignore, &save_intr);
sigaction (SIGQUIT, &ignore, &save_quit);
sigaction (SIGTSTP, &startup_handler, &save_stop);
switch (pid = fork ()) {
case -1:
closepipes ();
return -1;
case 0: {
sigaction (SIGINT, &save_intr, NULL);
sigaction (SIGQUIT, &save_quit, NULL);
switch (pid = fork ()) {
case -1:
closepipes ();
exit (1);
case 0: {
#define MAXARGS 16
int argno;
char *args[MAXARGS];
va_list ap;
int nulldevice;
port_shutdown_extra_fds ();
nulldevice = open ("/dev/null", O_WRONLY);
close (0);
dup (pipe0 [0]);
close (1);
dup (pipe1 [1]);
close (2);
dup (nulldevice);
close (nulldevice);
closepipes ();
va_start (ap, command);
argno = 0;
while ((args[argno++] = va_arg(ap, char *)) != NULL)
if (argno == (MAXARGS - 1)) {
args[argno] = NULL;
break;
}
va_end (ap);
execvp (command, args);
exit (0);
}
default:
{
char buffer [8192];
int i;
close (pipe0 [0]);
close (pipe1 [0]);
close (pipe1 [1]);
while ((i = mc_read (inhandle, buffer,
(inlen == -1 || inlen > 8192)
? 8192 : inlen)) > 0) {
write (pipe0 [1], buffer, i);
if (inlen != -1) {
inlen -= i;
if (!inlen)
break;
}
}
close (pipe0 [1]);
while (waitpid (pid, &i, 0) < 0)
if (errno != EINTR)
break;
port_shutdown_extra_fds ();
exit (i);
}
}
}
default:
*the_pid = pid;
break;
}
close (pipe0 [0]);
close (pipe0 [1]);
close (pipe1 [1]);
return pipe1 [0];
}
int mc_doublepclose (int pipe, pid_t pid)
{
int status = 0;
close (pipe);
waitpid (pid, &status, 0);
#ifdef SCO_FLAVOR
waitpid (-1, NULL, WNOHANG);
#endif /* SCO_FLAVOR */
sigaction (SIGINT, &save_intr, NULL);
sigaction (SIGQUIT, &save_quit, NULL);
sigaction (SIGTSTP, &save_stop, NULL);
return status;
}
/* Canonicalize path, and return a new path. Do everything in situ.
The new path differs from path in:
Multiple `/'s are collapsed to a single `/'.
Leading `./'s and trailing `/.'s are removed.
Trailing `/'s are removed.
Non-leading `../'s and trailing `..'s are handled by removing
portions of the path. */
char *canonicalize_pathname (char *path)
{
int i, start;
char stub_char;
stub_char = (*path == PATH_SEP) ? PATH_SEP : '.';
/* Walk along path looking for things to compact. */
i = 0;
for (;;) {
if (!path[i])
break;
while (path[i] && path[i] != PATH_SEP)
i++;
start = i++;
/* If we didn't find any slashes, then there is nothing left to do. */
if (!path[start])
break;
#if defined(__QNX__)
/*
** QNX accesses the directories of nodes on its peer-to-peer
** network by prefixing their directories with "//[nid]".
** We don't want to collapse two '/'s if they're at the start
** of the path, followed by digits, and ending with a '/'.
*/
if (start == 0 && i == 1)
{
char *p = path + 2;
char *q = strchr(p, PATH_SEP);
if (q > p)
{
*q = 0;
if (!strcspn(p, "0123456789"))
{
start = q - path;
i = start + 1;
}
*q = PATH_SEP;
}
}
#endif
/* Handle multiple `/'s in a row. */
while (path[i] == PATH_SEP)
i++;
if ((start + 1) != i) {
strcpy (path + start + 1, path + i);
i = start + 1;
}
/* Handle backquoted `/'. */
if (start > 0 && path[start - 1] == '\\')
continue;
/* Check for trailing `/'. */
if (start && !path[i]) {
zero_last:
path[--i] = '\0';
break;
}
/* Check for `../', `./' or trailing `.' by itself. */
if (path[i] == '.') {
/* Handle trailing `.' by itself. */
if (!path[i + 1])
goto zero_last;
/* Handle `./'. */
if (path[i + 1] == PATH_SEP) {
strcpy (path + i, path + i + 1);
i = start;
continue;
}
/* Handle `../' or trailing `..' by itself.
Remove the previous ?/ part with the exception of
../, which we should leave intact. */
if (path[i + 1] == '.' && (path[i + 2] == PATH_SEP || !path[i + 2])) {
while (--start > -1 && path[start] != PATH_SEP);
if (!strncmp (path + start + 1, "../", 3))
continue;
strcpy (path + start + 1, path + i + 2);
i = start;
continue;
}
}
}
if (!*path) {
*path = stub_char;
path[1] = '\0';
}
return path;
}
#ifdef SCO_FLAVOR
int gettimeofday( struct timeval * tv, struct timezone * tz)
{
struct timeb tb;
struct tm * l;
ftime( &tb );
if (errno == EFAULT)
return -1;
l = localtime(&tb.time);
tv->tv_sec = l->tm_sec;
tv->tv_usec = (long) tb.millitm;
return 0;
}
#endif /* SCO_FLAVOR */
#ifndef HAVE_PUTENV
/* The following piece of code was copied from the GNU C Library */
/* And is provided here for nextstep who lacks putenv */
extern char **environ;
#ifndef HAVE_GNU_LD
#define __environ environ
#endif
/* Put STRING, which is of the form "NAME=VALUE", in the environment. */
int
putenv (const char *string)
{
const char *const name_end = strchr (string, '=');
register size_t size;
register char **ep;
if (name_end == NULL){
/* Remove the variable from the environment. */
size = strlen (string);
for (ep = __environ; *ep != NULL; ++ep)
if (!strncmp (*ep, string, size) && (*ep)[size] == '='){
while (ep[1] != NULL){
ep[0] = ep[1];
++ep;
}
*ep = NULL;
return 0;
}
}
size = 0;
for (ep = __environ; *ep != NULL; ++ep)
if (!strncmp (*ep, string, name_end - string) &&
(*ep)[name_end - string] == '=')
break;
else
++size;
if (*ep == NULL){
static char **last_environ = NULL;
char **new_environ = (char **) malloc ((size + 2) * sizeof (char *));
if (new_environ == NULL)
return -1;
(void) memcpy ((void *) new_environ, (void *) __environ,
size * sizeof (char *));
new_environ[size] = (char *) string;
new_environ[size + 1] = NULL;
if (last_environ != NULL)
free ((void *) last_environ);
last_environ = new_environ;
__environ = new_environ;
}
else
*ep = (char *) string;
return 0;
}
#endif /* !HAVE_PUTENV */
void my_statfs (struct my_statfs *myfs_stats, char *path)
{
int i, len = 0;
#ifndef NO_INFOMOUNT
struct mount_entry *entry = NULL;
struct mount_entry *temp = mount_list;
struct fs_usage fs_use;
while (temp){
i = strlen (temp->me_mountdir);
if (i > len && (strncmp (path, temp->me_mountdir, i) == 0))
if (!entry || (path [i] == PATH_SEP || path [i] == 0)){
len = i;
entry = temp;
}
temp = temp->me_next;
}
if (entry){
get_fs_usage (entry->me_mountdir, &fs_use);
myfs_stats->type = entry->me_dev;
myfs_stats->typename = entry->me_type;
myfs_stats->mpoint = entry->me_mountdir;
myfs_stats->device = entry->me_devname;
myfs_stats->avail = getuid () ? fs_use.fsu_bavail/2 : fs_use.fsu_bfree/2;
myfs_stats->total = fs_use.fsu_blocks/2;
myfs_stats->nfree = fs_use.fsu_ffree;
myfs_stats->nodes = fs_use.fsu_files;
} else
#endif
#if defined(NO_INFOMOUNT) && defined(__QNX__)
/*
** This is the "other side" of the hack to read_filesystem_list() in
** mountlist.c.
** It's not the most efficient approach, but consumes less memory. It
** also accomodates QNX's ability to mount filesystems on the fly.
*/
struct mount_entry *entry;
struct fs_usage fs_use;
if ((entry = read_filesystem_list(0, 0)) != NULL)
{
get_fs_usage(entry->me_mountdir, &fs_use);
myfs_stats->type = entry->me_dev;
myfs_stats->typename = entry->me_type;
myfs_stats->mpoint = entry->me_mountdir;
myfs_stats->device = entry->me_devname;
myfs_stats->avail = fs_use.fsu_bfree / 2;
myfs_stats->total = fs_use.fsu_blocks / 2;
myfs_stats->nfree = fs_use.fsu_ffree;
myfs_stats->nodes = fs_use.fsu_files;
}
else
#endif
{
myfs_stats->type = 0;
myfs_stats->mpoint = "unknown";
myfs_stats->device = "unknown";
myfs_stats->avail = 0;
myfs_stats->total = 0;
myfs_stats->nfree = 0;
myfs_stats->nodes = 0;
}
}
#ifdef HAVE_GET_PROCESS_STATS
# include <sys/procstats.h>
int gettimeofday (struct timeval *tp, void *tzp)
{
return get_process_stats(tp, PS_SELF, 0, 0);
}
#endif
#ifdef SCO_FLAVOR
/* Define this only for SCO */
#ifdef USE_NETCODE
#ifndef HAVE_SOCKETPAIR
/*
The code for s_pipe function is adapted from Section 7.9
of the "UNIX Network Programming" by W. Richard Stevens,
published by Prentice Hall, ISBN 0-13-949876-1
(c) 1990 by P T R Prentice Hall
It is used to implement socketpair function for SVR3 systems
that lack it.
*/
#include <sys/types.h>
#include <sys/stream.h> /* defines queue_t */
#include <stropts.h> /* defines struct strtdinsert */
#include <fcntl.h>
#define SPX_DEVICE "/dev/spx"
#define S_PIPE_HANDLE_ERRNO 1
/* if the above is defined to 1, we will attempt to
save and restore errno to indicate failure
reason to the caller;
Please note that this will not work in environments
where errno is not just an integer
*/
#if S_PIPE_HANDLE_ERRNO
#include <errno.h>
/* This is for "extern int errno;" */
#endif
/* s_pipe returns 0 if OK, -1 on error */
/* two file descriptors are returned */
int s_pipe(int fd[2])
{
struct strfdinsert ins; /* stream I_FDINSERT ioctl format */
queue_t *pointer;
#if S_PIPE_HANDLE_ERRNO
int err_save;
#endif
/*
* First open the stream clone device "dev/spx" twice,
* obtaining the two file descriptors
*/
if ( (fd[0] = open(SPX_DEVICE, O_RDWR)) < 0)
return -1;
if ( (fd[1] = open(SPX_DEVICE, O_RDWR)) < 0) {
#if S_PIPE_HANDLE_ERRNO
err_save = errno;
#endif
close(fd[0]);
#if S_PIPE_HANDLE_ERRNO
errno = err_save;
#endif
return -1;
}
/*
* Now link these two stream together with an I_FDINSERT ioctl.
*/
ins.ctlbuf.buf = (char *) &pointer; /* no control information, just the pointer */
ins.ctlbuf.maxlen = sizeof pointer;
ins.ctlbuf.len = sizeof pointer;
ins.databuf.buf = (char *) 0; /* no data to be sent */
ins.databuf.maxlen = 0;
ins.databuf.len = -1; /* magic: must be -1 rather than 0 for stream pipes */
ins.fildes = fd[1]; /* the fd to connect with fd[0] */
ins.flags = 0; /* nonpriority message */
ins.offset = 0; /* offset of pointer in control buffer */
if (ioctl(fd[0], I_FDINSERT, (char *) &ins) < 0) {
#if S_PIPE_HANDLE_ERRNO
err_save = errno;
#endif
close(fd[0]);
close(fd[1]);
#if S_PIPE_HANDLE_ERRNO
errno = err_save;
#endif
return -1;
}
/* all is OK if we came here, indicate success */
return 0;
}
int socketpair(int dummy1, int dummy2, int dummy3, int fd[2])
{
return s_pipe(fd);
}
#endif /* ifndef HAVE_SOCKETPAIR */
#endif /* ifdef USE_NETCODE */
#endif /* SCO_FLAVOR */
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