diff options
Diffstat (limited to 'release/picobsd/tinyware/ash/redir.c')
| -rw-r--r-- | release/picobsd/tinyware/ash/redir.c | 375 |
1 files changed, 0 insertions, 375 deletions
diff --git a/release/picobsd/tinyware/ash/redir.c b/release/picobsd/tinyware/ash/redir.c deleted file mode 100644 index ae9116a..0000000 --- a/release/picobsd/tinyware/ash/redir.c +++ /dev/null @@ -1,375 +0,0 @@ -/* $NetBSD: redir.c,v 1.16 1997/07/04 21:02:21 christos Exp $ */ - -/*- - * Copyright (c) 1991, 1993 - * The Regents of the University of California. All rights reserved. - * - * This code is derived from software contributed to Berkeley by - * Kenneth Almquist. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 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 - * SUCH DAMAGE. - */ - -#include <sys/cdefs.h> -#ifndef lint -#if 0 -static char sccsid[] = "@(#)redir.c 8.2 (Berkeley) 5/4/95"; -#else -__RCSID("$NetBSD: redir.c,v 1.16 1997/07/04 21:02:21 christos Exp $"); -#endif -#endif /* not lint */ - -#include <sys/types.h> -#include <signal.h> -#include <string.h> -#include <fcntl.h> -#include <errno.h> -#include <unistd.h> -#include <stdlib.h> - -/* - * Code for dealing with input/output redirection. - */ - -#include "shell.h" -#include "nodes.h" -#include "jobs.h" -#include "expand.h" -#include "redir.h" -#include "output.h" -#include "memalloc.h" -#include "error.h" - - -#define EMPTY -2 /* marks an unused slot in redirtab */ -#define PIPESIZE 4096 /* amount of buffering in a pipe */ - - -MKINIT -struct redirtab { - struct redirtab *next; - short renamed[10]; -}; - - -MKINIT struct redirtab *redirlist; - -/* - * We keep track of whether or not fd0 has been redirected. This is for - * background commands, where we want to redirect fd0 to /dev/null only - * if it hasn't already been redirected. -*/ -int fd0_redirected = 0; - -STATIC void openredirect __P((union node *, char[10 ])); -STATIC int openhere __P((union node *)); - - -/* - * Process a list of redirection commands. If the REDIR_PUSH flag is set, - * old file descriptors are stashed away so that the redirection can be - * undone by calling popredir. If the REDIR_BACKQ flag is set, then the - * standard output, and the standard error if it becomes a duplicate of - * stdout, is saved in memory. - */ - -void -redirect(redir, flags) - union node *redir; - int flags; - { - union node *n; - struct redirtab *sv = NULL; - int i; - int fd; - int try; - char memory[10]; /* file descriptors to write to memory */ - - for (i = 10 ; --i >= 0 ; ) - memory[i] = 0; - memory[1] = flags & REDIR_BACKQ; - if (flags & REDIR_PUSH) { - sv = ckmalloc(sizeof (struct redirtab)); - for (i = 0 ; i < 10 ; i++) - sv->renamed[i] = EMPTY; - sv->next = redirlist; - redirlist = sv; - } - for (n = redir ; n ; n = n->nfile.next) { - fd = n->nfile.fd; - try = 0; - if ((n->nfile.type == NTOFD || n->nfile.type == NFROMFD) && - n->ndup.dupfd == fd) - continue; /* redirect from/to same file descriptor */ - - if ((flags & REDIR_PUSH) && sv->renamed[fd] == EMPTY) { - INTOFF; -again: - if ((i = fcntl(fd, F_DUPFD, 10)) == -1) { - switch (errno) { - case EBADF: - if (!try) { - openredirect(n, memory); - try++; - goto again; - } - /* FALLTHROUGH*/ - default: - INTON; - error("%d: %s", fd, strerror(errno)); - break; - } - } - if (!try) { - sv->renamed[fd] = i; - close(fd); - } - INTON; - } else { - close(fd); - } - if (fd == 0) - fd0_redirected++; - if (!try) - openredirect(n, memory); - } - if (memory[1]) - out1 = &memout; - if (memory[2]) - out2 = &memout; -} - - -STATIC void -openredirect(redir, memory) - union node *redir; - char memory[10]; - { - int fd = redir->nfile.fd; - char *fname; - int f; - - /* - * We suppress interrupts so that we won't leave open file - * descriptors around. This may not be such a good idea because - * an open of a device or a fifo can block indefinitely. - */ - INTOFF; - memory[fd] = 0; - switch (redir->nfile.type) { - case NFROM: - fname = redir->nfile.expfname; - if ((f = open(fname, O_RDONLY)) < 0) - error("cannot open %s: %s", fname, errmsg(errno, E_OPEN)); -movefd: - if (f != fd) { - copyfd(f, fd); - close(f); - } - break; - case NTO: - fname = redir->nfile.expfname; -#ifdef O_CREAT - if ((f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) < 0) - error("cannot create %s: %s", fname, errmsg(errno, E_CREAT)); -#else - if ((f = creat(fname, 0666)) < 0) - error("cannot create %s: %s", fname, errmsg(errno, E_CREAT)); -#endif - goto movefd; - case NAPPEND: - fname = redir->nfile.expfname; -#ifdef O_APPEND - if ((f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666)) < 0) - error("cannot create %s: %s", fname, errmsg(errno, E_CREAT)); -#else - if ((f = open(fname, O_WRONLY)) < 0 - && (f = creat(fname, 0666)) < 0) - error("cannot create %s: %s", fname, errmsg(errno, E_CREAT)); - lseek(f, (off_t)0, 2); -#endif - goto movefd; - case NTOFD: - case NFROMFD: - if (redir->ndup.dupfd >= 0) { /* if not ">&-" */ - if (memory[redir->ndup.dupfd]) - memory[fd] = 1; - else - copyfd(redir->ndup.dupfd, fd); - } - break; - case NHERE: - case NXHERE: - f = openhere(redir); - goto movefd; - default: - abort(); - } - INTON; -} - - -/* - * Handle here documents. Normally we fork off a process to write the - * data to a pipe. If the document is short, we can stuff the data in - * the pipe without forking. - */ - -STATIC int -openhere(redir) - union node *redir; - { - int pip[2]; - int len = 0; - - if (pipe(pip) < 0) - error("Pipe call failed"); - if (redir->type == NHERE) { - len = strlen(redir->nhere.doc->narg.text); - if (len <= PIPESIZE) { - xwrite(pip[1], redir->nhere.doc->narg.text, len); - goto out; - } - } - if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) { - close(pip[0]); - signal(SIGINT, SIG_IGN); - signal(SIGQUIT, SIG_IGN); - signal(SIGHUP, SIG_IGN); -#ifdef SIGTSTP - signal(SIGTSTP, SIG_IGN); -#endif - signal(SIGPIPE, SIG_DFL); - if (redir->type == NHERE) - xwrite(pip[1], redir->nhere.doc->narg.text, len); - else - expandhere(redir->nhere.doc, pip[1]); - _exit(0); - } -out: - close(pip[1]); - return pip[0]; -} - - - -/* - * Undo the effects of the last redirection. - */ - -void -popredir() { - struct redirtab *rp = redirlist; - int i; - - for (i = 0 ; i < 10 ; i++) { - if (rp->renamed[i] != EMPTY) { - if (i == 0) - fd0_redirected--; - close(i); - if (rp->renamed[i] >= 0) { - copyfd(rp->renamed[i], i); - close(rp->renamed[i]); - } - } - } - INTOFF; - redirlist = rp->next; - ckfree(rp); - INTON; -} - -/* - * Undo all redirections. Called on error or interrupt. - */ - -#ifdef mkinit - -INCLUDE "redir.h" - -RESET { - while (redirlist) - popredir(); -} - -SHELLPROC { - clearredir(); -} - -#endif - -/* Return true if fd 0 has already been redirected at least once. */ -int -fd0_redirected_p () { - return fd0_redirected != 0; -} - -/* - * Discard all saved file descriptors. - */ - -void -clearredir() { - struct redirtab *rp; - int i; - - for (rp = redirlist ; rp ; rp = rp->next) { - for (i = 0 ; i < 10 ; i++) { - if (rp->renamed[i] >= 0) { - close(rp->renamed[i]); - } - rp->renamed[i] = EMPTY; - } - } -} - - - -/* - * Copy a file descriptor to be >= to. Returns -1 - * if the source file descriptor is closed, EMPTY if there are no unused - * file descriptors left. - */ - -int -copyfd(from, to) - int from; - int to; -{ - int newfd; - - newfd = fcntl(from, F_DUPFD, to); - if (newfd < 0) { - if (errno == EMFILE) - return EMPTY; - else - error("%d: %s", from, strerror(errno)); - } - return newfd; -} |
