/* redir.c -- Functions to perform input and output redirection. */
-/* Copyright (C) 1997-2002 Free Software Foundation, Inc.
+/* Copyright (C) 1997-2021 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
- Bash 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, or (at your option)
- any later version.
+ Bash 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 3 of the License, or
+ (at your option) any later version.
- Bash 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.
+ Bash 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 Bash; see the file COPYING. If not, write to the Free
- Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
+ along with Bash. If not, see <http://www.gnu.org/licenses/>.
+*/
+
#include "config.h"
#if !defined (__GNUC__) && !defined (HAVE_ALLOCA_H) && defined (_AIX)
#include <stdio.h>
#include "bashtypes.h"
-#ifndef _MINIX
+#if !defined (_MINIX) && defined (HAVE_SYS_FILE_H)
# include <sys/file.h>
#endif
#include "filecntl.h"
#endif
#include "bashansi.h"
-
+#include "bashintl.h"
#include "memalloc.h"
+
+#define NEED_FPURGE_DECL
+
#include "shell.h"
#include "flags.h"
#include "execute_cmd.h"
#include "redir.h"
+#include "trap.h"
#if defined (BUFFERED_INPUT)
# include "input.h"
#endif
-extern int posixly_correct;
+#include "builtins/pipesize.h"
+
+/* FreeBSD 13 can reliably handle atomic writes at this capacity without
+ hanging. */
+#if __FreeBSD__ && !defined (HEREDOC_PIPESIZE)
+# define HEREDOC_PIPESIZE 4096
+#endif
+
+/* Normally set by a build process command that computes pipe capacity */
+#ifndef PIPESIZE
+# ifdef PIPE_BUF
+# define PIPESIZE PIPE_BUF
+# else
+# define PIPESIZE 4096
+# endif
+#endif
+
+#ifndef HEREDOC_PIPESIZE
+# define HEREDOC_PIPESIZE PIPESIZE
+#endif
+
+#if defined (HEREDOC_PIPEMAX)
+# if HEREDOC_PIPESIZE > HEREDOC_PIPEMAX
+# define HEREDOC_PIPESIZE HEREDOC_PIPEMAX
+# endif
+#endif
+
+#define SHELL_FD_BASE 10
+
+int expanding_redir;
+int varassign_redir_autoclose = 0;
+
extern REDIRECT *redirection_undo_list;
extern REDIRECT *exec_redirection_undo_list;
/* Static functions defined and used in this file. */
-static void add_undo_close_redirect __P((int));
-static void add_exec_redirect __P((REDIRECT *));
-static int add_undo_redirect __P((int));
-static int expandable_redirection_filename __P((REDIRECT *));
-static int stdin_redirection __P((enum r_instruction, int));
-static int do_redirection_internal __P((REDIRECT *, int, int, int));
+static void add_exec_redirect PARAMS((REDIRECT *));
+static int add_undo_redirect PARAMS((int, enum r_instruction, int));
+static int add_undo_close_redirect PARAMS((int));
+static int expandable_redirection_filename PARAMS((REDIRECT *));
+static int stdin_redirection PARAMS((enum r_instruction, int));
+static int undoablefd PARAMS((int));
+static int do_redirection_internal PARAMS((REDIRECT *, int, char **));
-static int write_here_document __P((int, WORD_DESC *));
-static int write_here_string __P((int, WORD_DESC *));
-static int here_document_to_fd __P((WORD_DESC *, enum r_instruction));
+static char *heredoc_expand PARAMS((WORD_DESC *, enum r_instruction, size_t *));
+static int heredoc_write PARAMS((int, char *, size_t));
+static int here_document_to_fd PARAMS((WORD_DESC *, enum r_instruction));
-static int redir_special_open __P((int, char *, int, int, enum r_instruction));
-static int noclobber_open __P((char *, int, int, enum r_instruction));
-static int redir_open __P((char *, int, int, enum r_instruction));
+static int redir_special_open PARAMS((int, char *, int, int, enum r_instruction));
+static int noclobber_open PARAMS((char *, int, int, enum r_instruction));
+static int redir_open PARAMS((char *, int, int, enum r_instruction));
+
+static int redir_varassign PARAMS((REDIRECT *, int));
+static int redir_varvalue PARAMS((REDIRECT *));
/* Spare redirector used when translating [N]>&WORD[-] or [N]<&WORD[-] to
a new redirection and when creating the redirection undo list. */
Used to print a reasonable error message. */
static int heredoc_errno;
+#define REDIRECTION_ERROR(r, e, fd) \
+do { \
+ if ((r) < 0) \
+ { \
+ if (fd >= 0) \
+ close (fd); \
+ set_exit_status (EXECUTION_FAILURE);\
+ return ((e) == 0 ? EINVAL : (e));\
+ } \
+} while (0)
+
void
-redirection_error (temp, error)
+redirection_error (temp, error, fn)
REDIRECT *temp;
int error;
+ char *fn; /* already-expanded filename */
{
char *filename, *allocname;
int oflags;
allocname = 0;
- if (temp->redirector < 0)
+ if ((temp->rflags & REDIR_VARASSIGN) && error < 0)
+ filename = allocname = savestring (temp->redirector.filename->word);
+ else if ((temp->rflags & REDIR_VARASSIGN) == 0 && temp->redirector.dest < 0)
/* This can happen when read_token_word encounters overflow, like in
exec 4294967297>x */
- filename = "file descriptor out of range";
+ filename = _("file descriptor out of range");
#ifdef EBADF
- else if (temp->redirector >= 0 && errno == EBADF)
+ /* This error can never involve NOCLOBBER */
+ else if (error != NOCLOBBER_REDIRECT && temp->redirector.dest >= 0 && error == EBADF)
{
/* If we're dealing with two file descriptors, we have to guess about
which one is invalid; in the cases of r_{duplicating,move}_input and
case r_move_output:
filename = allocname = itos (temp->redirectee.dest);
break;
+ case r_duplicating_input_word:
+ if (temp->redirector.dest == 0) /* Guess */
+ filename = temp->redirectee.filename->word; /* XXX */
+ else
+ filename = allocname = itos (temp->redirector.dest);
+ break;
+ case r_duplicating_output_word:
+ if (temp->redirector.dest == 1) /* Guess */
+ filename = temp->redirectee.filename->word; /* XXX */
+ else
+ filename = allocname = itos (temp->redirector.dest);
+ break;
default:
- filename = allocname = itos (temp->redirector);
+ filename = allocname = itos (temp->redirector.dest);
break;
}
}
#endif
+ else if (fn)
+ filename = fn;
else if (expandable_redirection_filename (temp))
{
+ oflags = temp->redirectee.filename->flags;
if (posixly_correct && interactive_shell == 0)
- {
- oflags = temp->redirectee.filename->flags;
- temp->redirectee.filename->flags |= W_NOGLOB;
- }
+ temp->redirectee.filename->flags |= W_NOGLOB;
+ temp->redirectee.filename->flags |= W_NOCOMSUB;
filename = allocname = redirection_expand (temp->redirectee.filename);
- if (posixly_correct && interactive_shell == 0)
- temp->redirectee.filename->flags = oflags;
+ temp->redirectee.filename->flags = oflags;
if (filename == 0)
filename = temp->redirectee.filename->word;
}
else if (temp->redirectee.dest < 0)
- filename = "file descriptor out of range";
+ filename = _("file descriptor out of range");
else
filename = allocname = itos (temp->redirectee.dest);
switch (error)
{
case AMBIGUOUS_REDIRECT:
- internal_error ("%s: ambiguous redirect", filename);
+ internal_error (_("%s: ambiguous redirect"), filename);
break;
case NOCLOBBER_REDIRECT:
- internal_error ("%s: cannot overwrite existing file", filename);
+ internal_error (_("%s: cannot overwrite existing file"), filename);
break;
#if defined (RESTRICTED_SHELL)
case RESTRICTED_REDIRECT:
- internal_error ("%s: restricted: cannot redirect output", filename);
+ internal_error (_("%s: restricted: cannot redirect output"), filename);
break;
#endif /* RESTRICTED_SHELL */
case HEREDOC_REDIRECT:
- internal_error ("cannot create temp file for here document: %s", strerror (heredoc_errno));
+ internal_error (_("cannot create temp file for here-document: %s"), strerror (heredoc_errno));
+ break;
+
+ case BADVAR_REDIRECT:
+ internal_error (_("%s: cannot assign fd to variable"), filename);
break;
default:
FREE (allocname);
}
-/* Perform the redirections on LIST. If FOR_REAL, then actually make
- input and output file descriptors, otherwise just do whatever is
- neccessary for side effecting. INTERNAL says to remember how to
- undo the redirections later, if non-zero. If SET_CLEXEC is non-zero,
- file descriptors opened in do_redirection () have their close-on-exec
- flag set. */
+/* Perform the redirections on LIST. If flags & RX_ACTIVE, then actually
+ make input and output file descriptors, otherwise just do whatever is
+ necessary for side effecting. flags & RX_UNDOABLE says to remember
+ how to undo the redirections later, if non-zero. If flags & RX_CLEXEC
+ is non-zero, file descriptors opened in do_redirection () have their
+ close-on-exec flag set. */
int
-do_redirections (list, for_real, internal, set_clexec)
+do_redirections (list, flags)
REDIRECT *list;
- int for_real, internal, set_clexec;
+ int flags;
{
int error;
REDIRECT *temp;
+ char *fn;
- if (internal)
+ if (flags & RX_UNDOABLE)
{
if (redirection_undo_list)
{
for (temp = list; temp; temp = temp->next)
{
- error = do_redirection_internal (temp, for_real, internal, set_clexec);
+ fn = 0;
+ error = do_redirection_internal (temp, flags, &fn);
if (error)
{
- redirection_error (temp, error);
+ redirection_error (temp, error, fn);
+ FREE (fn);
return (error);
}
+ FREE (fn);
}
return (0);
}
case r_input_direction:
case r_inputa_direction:
case r_err_and_out:
+ case r_append_err_and_out:
case r_input_output:
case r_output_force:
case r_duplicating_input_word:
char *result;
WORD_LIST *tlist1, *tlist2;
WORD_DESC *w;
+ int old;
w = copy_word (word);
if (posixly_correct)
w->flags |= W_NOSPLIT;
tlist1 = make_word_list (w, (WORD_LIST *)NULL);
+ expanding_redir = 1;
+ /* Now that we've changed the variable search order to ignore the temp
+ environment, see if we need to change the cached IFS values. */
+ sv_ifs ("IFS");
tlist2 = expand_words_no_vars (tlist1);
+ expanding_redir = 0;
+ /* Now we need to change the variable search order back to include the temp
+ environment. We force the temp environment search by forcing
+ executing_builtin to 1. This is what makes `read' get the right values
+ for the IFS-related cached variables, for example. */
+ old = executing_builtin;
+ executing_builtin = 1;
+ sv_ifs ("IFS");
+ executing_builtin = old;
dispose_words (tlist1);
- if (!tlist2 || tlist2->next)
+ if (tlist2 == 0 || tlist2->next)
{
/* We expanded to no words, or to more than a single word.
Dispose of the word list and return NULL. */
return (result);
}
-static int
-write_here_string (fd, redirectee)
- int fd;
+/* Expand a here-document or here-string (determined by RI) contained in
+ REDIRECTEE and return the expanded document. If LENP is non-zero, put
+ the length of the returned string into *LENP.
+
+ This captures everything about expanding here-documents and here-strings:
+ the returned document should be written directly to whatever file
+ descriptor is specified. In particular, it adds a newline to the end of
+ a here-string to preserve previous semantics. */
+static char *
+heredoc_expand (redirectee, ri, lenp)
WORD_DESC *redirectee;
+ enum r_instruction ri;
+ size_t *lenp;
{
- char *herestr;
- int herelen, n, e;
+ char *document;
+ size_t dlen;
+ int old;
- herestr = expand_string_to_string (redirectee->word, 0);
- herelen = strlen (herestr);
+ if (redirectee->word == 0 || redirectee->word[0] == '\0')
+ {
+ if (lenp)
+ *lenp = 0;
+ return (redirectee->word);
+ }
- n = write (fd, herestr, herelen);
- if (n == herelen)
+ /* Quoted here documents are not expanded */
+ if (ri != r_reading_string && (redirectee->flags & W_QUOTED))
{
- n = write (fd, "\n", 1);
- herelen = 1;
+ if (lenp)
+ *lenp = STRLEN (redirectee->word);
+ return (redirectee->word);
}
+
+ expanding_redir = 1;
+ /* Now that we've changed the variable search order to ignore the temp
+ environment, see if we need to change the cached IFS values. */
+ sv_ifs ("IFS");
+ document = (ri == r_reading_string) ? expand_assignment_string_to_string (redirectee->word, 0)
+ : expand_string_to_string (redirectee->word, Q_HERE_DOCUMENT);
+ expanding_redir = 0;
+ /* Now we need to change the variable search order back to include the temp
+ environment. We force the temp environment search by forcing
+ executing_builtin to 1. This is what makes `read' get the right values
+ for the IFS-related cached variables, for example. */
+ old = executing_builtin;
+ executing_builtin = 1;
+ sv_ifs ("IFS");
+ executing_builtin = old;
+
+ dlen = STRLEN (document);
+ /* XXX - Add trailing newline to here-string */
+ if (ri == r_reading_string)
+ {
+ document = xrealloc (document, dlen + 2);
+ document[dlen++] = '\n';
+ document[dlen] = '\0';
+ }
+ if (lenp)
+ *lenp = dlen;
+
+ return document;
+}
+
+/* Write HEREDOC (of length HDLEN) to FD, returning 0 on success and ERRNO on
+ error. Don't handle interrupts. */
+static int
+heredoc_write (fd, heredoc, herelen)
+ int fd;
+ char *heredoc;
+ size_t herelen;
+{
+ ssize_t nw;
+ int e;
+
+ errno = 0;
+ nw = write (fd, heredoc, herelen);
e = errno;
- free (herestr);
- if (n != herelen)
+ if (nw != herelen)
{
if (e == 0)
e = ENOSPC;
return e;
}
return 0;
-}
+}
-/* Write the text of the here document pointed to by REDIRECTEE to the file
- descriptor FD, which is already open to a temp file. Return 0 if the
- write is successful, otherwise return errno. */
+/* Create a temporary file or pipe holding the text of the here document
+ pointed to by REDIRECTEE, and return a file descriptor open for reading
+ to it. Return -1 on any error, and make sure errno is set appropriately. */
static int
-write_here_document (fd, redirectee)
- int fd;
+here_document_to_fd (redirectee, ri)
WORD_DESC *redirectee;
+ enum r_instruction ri;
{
+ char *filename;
+ int r, fd, fd2, herepipe[2];
char *document;
- int document_len, fd2;
- FILE *fp;
- register WORD_LIST *t, *tlist;
+ size_t document_len;
+#if HEREDOC_PARANOID
+ struct stat st1, st2;
+#endif
- /* Expand the text if the word that was specified had
- no quoting. The text that we expand is treated
- exactly as if it were surrounded by double quotes. */
+ /* Expand the here-document/here-string first and then decide what to do. */
+ document = heredoc_expand (redirectee, ri, &document_len);
- if (redirectee->flags & W_QUOTED)
+ /* If we have a zero-length document, don't mess with a temp file */
+ if (document_len == 0)
{
- document = redirectee->word;
- document_len = strlen (document);
- /* Set errno to something reasonable if the write fails. */
- if (write (fd, document, document_len) < document_len)
- {
- if (errno == 0)
- errno = ENOSPC;
- return (errno);
- }
- else
- return 0;
+ fd = open ("/dev/null", O_RDONLY);
+ r = errno;
+ if (document != redirectee->word)
+ FREE (document);
+ errno = r;
+ return fd;
}
- tlist = expand_string (redirectee->word, Q_HERE_DOCUMENT);
- if (tlist)
+ if (shell_compatibility_level <= 50)
+ goto use_tempfile;
+
+#if HEREDOC_PIPESIZE
+ /* Try to use a pipe internal to this process if the document is shorter
+ than the system's pipe capacity (computed at build time). We want to
+ write the entire document without write blocking. */
+ if (document_len <= HEREDOC_PIPESIZE)
{
- /* Try using buffered I/O (stdio) and writing a word
- at a time, letting stdio do the work of buffering
- for us rather than managing our own strings. Most
- stdios are not particularly fast, however -- this
- may need to be reconsidered later. */
- if ((fd2 = dup (fd)) < 0 || (fp = fdopen (fd2, "w")) == NULL)
+ if (pipe (herepipe) < 0)
{
- if (fd2 >= 0)
- close (fd2);
- return (errno);
+ /* XXX - goto use_tempfile; ? */
+ r = errno;
+ if (document != redirectee->word)
+ free (document);
+ errno = r;
+ return (-1);
}
- errno = 0;
- for (t = tlist; t; t = t->next)
- {
- /* This is essentially the body of
- string_list_internal expanded inline. */
- document = t->word->word;
- document_len = strlen (document);
- if (t != tlist)
- putc (' ', fp); /* separator */
- fwrite (document, document_len, 1, fp);
- if (ferror (fp))
- {
- if (errno == 0)
- errno = ENOSPC;
- fd2 = errno;
- fclose(fp);
- dispose_words (tlist);
- return (fd2);
- }
- }
- dispose_words (tlist);
- if (fclose (fp) != 0)
+
+#if defined (F_GETPIPE_SZ)
+ if (fcntl (herepipe[1], F_GETPIPE_SZ, 0) < document_len)
+ goto use_tempfile;
+#endif
+
+ r = heredoc_write (herepipe[1], document, document_len);
+ if (document != redirectee->word)
+ free (document);
+ close (herepipe[1]);
+ if (r) /* write error */
{
- if (errno == 0)
- errno = ENOSPC;
- return (errno);
+ close (herepipe[0]);
+ errno = r;
+ return (-1);
}
+ return (herepipe[0]);
}
- return 0;
-}
+#endif
-/* Create a temporary file holding the text of the here document pointed to
- by REDIRECTEE, and return a file descriptor open for reading to the temp
- file. Return -1 on any error, and make sure errno is set appropriately. */
-static int
-here_document_to_fd (redirectee, ri)
- WORD_DESC *redirectee;
- enum r_instruction ri;
-{
- char *filename;
- int r, fd, fd2;
+use_tempfile:
- fd = sh_mktmpfd ("sh-thd", MT_USERANDOM, &filename);
+ fd = sh_mktmpfd ("sh-thd", MT_USERANDOM|MT_USETMPDIR, &filename);
/* If we failed for some reason other than the file existing, abort */
if (fd < 0)
{
+ r = errno;
FREE (filename);
+ if (document != redirectee->word)
+ FREE (document);
+ errno = r;
return (fd);
}
+ fchmod (fd, S_IRUSR | S_IWUSR);
+ SET_CLOSE_ON_EXEC (fd);
+
errno = r = 0; /* XXX */
- /* write_here_document returns 0 on success, errno on failure. */
- if (redirectee->word)
- r = (ri != r_reading_string) ? write_here_document (fd, redirectee)
- : write_here_string (fd, redirectee);
+ r = heredoc_write (fd, document, document_len);
+ if (document != redirectee->word)
+ FREE (document);
if (r)
{
/* In an attempt to avoid races, we close the first fd only after opening
the second. */
/* Make the document really temporary. Also make it the input. */
- fd2 = open (filename, O_RDONLY, 0600);
+ fd2 = open (filename, O_RDONLY|O_BINARY, 0600);
if (fd2 < 0)
{
return -1;
}
+#if HEREDOC_PARANOID
+ /* We can use same_file here to check whether or not fd and fd2 refer to
+ the same file, but we don't do that unless HEREDOC_PARANOID is defined. */
+ if (fstat (fd, &st1) < 0 || S_ISREG (st1.st_mode) == 0 ||
+ fstat (fd2, &st2) < 0 || S_ISREG (st2.st_mode) == 0 ||
+ same_file (filename, filename, &st1, &st2) == 0)
+ {
+ unlink (filename);
+ free (filename);
+ close (fd);
+ close (fd2);
+ errno = EEXIST;
+ return -1;
+ }
+#endif
+
close (fd);
if (unlink (filename) < 0)
{
r = errno;
-#if defined (__CYGWIN__)
- /* Under CygWin 1.1.0, the unlink will fail if the file is
- open. This hack will allow the previous action of silently
- ignoring the error, but will still leave the file there. This
- needs some kind of magic. */
- if (r == EACCES)
- return (fd2);
-#endif /* __CYGWIN__ */
close (fd2);
free (filename);
errno = r;
}
free (filename);
+
+ fchmod (fd2, S_IRUSR);
return (fd2);
}
if (all_digits (filename+8) && legal_number (filename+8, &lfd) && lfd == (int)lfd)
{
fd = lfd;
- fd = fcntl (fd, F_DUPFD, 10);
+ fd = fcntl (fd, F_DUPFD, SHELL_FD_BASE);
}
else
fd = AMBIGUOUS_REDIRECT;
#if !defined (HAVE_DEV_STDIN)
case RF_DEVSTDIN:
- fd = fcntl (0, F_DUPFD, 10);
+ fd = fcntl (0, F_DUPFD, SHELL_FD_BASE);
break;
case RF_DEVSTDOUT:
- fd = fcntl (1, F_DUPFD, 10);
+ fd = fcntl (1, F_DUPFD, SHELL_FD_BASE);
break;
case RF_DEVSTDERR:
- fd = fcntl (2, F_DUPFD, 10);
+ fd = fcntl (2, F_DUPFD, SHELL_FD_BASE);
break;
#endif
#if defined (NETWORK_REDIRECTIONS)
case RF_DEVTCP:
case RF_DEVUDP:
+#if defined (RESTRICTED_SHELL)
+ if (restricted)
+ return (RESTRICTED_REDIRECT);
+#endif
#if defined (HAVE_NETWORK)
fd = netopen (filename);
#else
- internal_warning ("/dev/(tcp|udp)/host/port not supported without networking");
+ internal_warning (_("/dev/(tcp|udp)/host/port not supported without networking"));
fd = open (filename, flags, mode);
#endif
break;
int flags, mode;
enum r_instruction ri;
{
- int fd, r;
+ int fd, r, e;
r = find_string_in_alist (filename, _redir_special_filenames, 1);
if (r >= 0)
}
else
{
- fd = open (filename, flags, mode);
+ do
+ {
+ fd = open (filename, flags, mode);
+ e = errno;
+ if (fd < 0 && e == EINTR)
+ {
+ QUIT;
+ run_pending_traps ();
+ }
+ errno = e;
+ }
+ while (fd < 0 && errno == EINTR);
+
#if defined (AFS)
if ((fd < 0) && (errno == EACCES))
- fd = open (filename, flags & ~O_CREAT, mode);
+ {
+ fd = open (filename, flags & ~O_CREAT, mode);
+ errno = EACCES; /* restore errno */
+ }
#endif /* AFS */
}
return fd;
}
+static int
+undoablefd (fd)
+ int fd;
+{
+ int clexec;
+
+ clexec = fcntl (fd, F_GETFD, 0);
+ if (clexec == -1 || (fd >= SHELL_FD_BASE && clexec == 1))
+ return 0;
+ return 1;
+}
+
/* Do the specific redirection requested. Returns errno or one of the
special redirection errors (*_REDIRECT) in case of error, 0 on success.
- If FOR_REAL is zero, then just do whatever is neccessary to produce the
- appropriate side effects. REMEMBERING, if non-zero, says to remember
- how to undo each redirection. If SET_CLEXEC is non-zero, then
- we set all file descriptors > 2 that we open to be close-on-exec. */
+ If flags & RX_ACTIVE is zero, then just do whatever is necessary to
+ produce the appropriate side effects. flags & RX_UNDOABLE, if non-zero,
+ says to remember how to undo each redirection. If flags & RX_CLEXEC is
+ non-zero, then we set all file descriptors > 2 that we open to be
+ close-on-exec. FNP, if non-null is a pointer to a location where the
+ expanded filename is stored. The caller will free it. */
static int
-do_redirection_internal (redirect, for_real, remembering, set_clexec)
+do_redirection_internal (redirect, flags, fnp)
REDIRECT *redirect;
- int for_real, remembering, set_clexec;
+ int flags;
+ char **fnp;
{
WORD_DESC *redirectee;
int redir_fd, fd, redirector, r, oflags;
char *redirectee_word;
enum r_instruction ri;
REDIRECT *new_redirect;
+ REDIRECTEE sd;
redirectee = redirect->redirectee.filename;
redir_fd = redirect->redirectee.dest;
- redirector = redirect->redirector;
+ redirector = redirect->redirector.dest;
ri = redirect->instruction;
+ if (redirect->flags & RX_INTERNAL)
+ flags |= RX_INTERNAL;
+
if (TRANSLATE_REDIRECT (ri))
{
- /* We have [N]>&WORD[-] or [N]<&WORD[-]. Expand WORD, then translate
- the redirection into a new one and continue. */
+ /* We have [N]>&WORD[-] or [N]<&WORD[-] (or {V}>&WORD[-] or {V}<&WORD-).
+ and WORD, then translate the redirection into a new one and
+ continue. */
redirectee_word = redirection_expand (redirectee);
/* XXX - what to do with [N]<&$w- where w is unset or null? ksh93
- closes N. */
- if (redirectee_word == 0)
+ turns it into [N]<&- or [N]>&- and closes N. */
+ if ((ri == r_move_input_word || ri == r_move_output_word) && redirectee_word == 0)
+ {
+ sd = redirect->redirector;
+ rd.dest = 0;
+ new_redirect = make_redirection (sd, r_close_this, rd, 0);
+ }
+ else if (redirectee_word == 0)
return (AMBIGUOUS_REDIRECT);
else if (redirectee_word[0] == '-' && redirectee_word[1] == '\0')
{
+ sd = redirect->redirector;
rd.dest = 0;
- new_redirect = make_redirection (redirector, r_close_this, rd);
+ new_redirect = make_redirection (sd, r_close_this, rd, 0);
}
else if (all_digits (redirectee_word))
{
+ sd = redirect->redirector;
if (legal_number (redirectee_word, &lfd) && (int)lfd == lfd)
rd.dest = lfd;
else
switch (ri)
{
case r_duplicating_input_word:
- new_redirect = make_redirection (redirector, r_duplicating_input, rd);
+ new_redirect = make_redirection (sd, r_duplicating_input, rd, 0);
break;
case r_duplicating_output_word:
- new_redirect = make_redirection (redirector, r_duplicating_output, rd);
+ new_redirect = make_redirection (sd, r_duplicating_output, rd, 0);
break;
case r_move_input_word:
- new_redirect = make_redirection (redirector, r_move_input, rd);
+ new_redirect = make_redirection (sd, r_move_input, rd, 0);
break;
case r_move_output_word:
- new_redirect = make_redirection (redirector, r_move_output, rd);
+ new_redirect = make_redirection (sd, r_move_output, rd, 0);
break;
+ default:
+ break; /* shut up gcc */
}
}
- else if (ri == r_duplicating_output_word && redirector == 1)
+ else if (ri == r_duplicating_output_word && (redirect->rflags & REDIR_VARASSIGN) == 0 && redirector == 1)
{
+ sd = redirect->redirector;
rd.filename = make_bare_word (redirectee_word);
- new_redirect = make_redirection (1, r_err_and_out, rd);
+ new_redirect = make_redirection (sd, r_err_and_out, rd, 0);
}
else
{
redirectee = new_redirect->redirectee.filename;
redir_fd = new_redirect->redirectee.dest;
- redirector = new_redirect->redirector;
+ redirector = new_redirect->redirector.dest;
ri = new_redirect->instruction;
/* Overwrite the flags element of the old redirect with the new value. */
case r_input_direction:
case r_inputa_direction:
case r_err_and_out: /* command &>filename */
+ case r_append_err_and_out: /* command &>> filename */
case r_input_output:
case r_output_force:
if (posixly_correct && interactive_shell == 0)
#endif /* RESTRICTED_SHELL */
fd = redir_open (redirectee_word, redirect->flags, 0666, ri);
- free (redirectee_word);
+ if (fnp)
+ *fnp = redirectee_word;
+ else
+ free (redirectee_word);
- if (fd == NOCLOBBER_REDIRECT)
+ if (fd == NOCLOBBER_REDIRECT || fd == RESTRICTED_REDIRECT)
return (fd);
if (fd < 0)
return (errno);
- if (for_real)
+ if (flags & RX_ACTIVE)
{
- if (remembering)
+ if (redirect->rflags & REDIR_VARASSIGN)
{
- /* Only setup to undo it if the thing to undo is active. */
- if ((fd != redirector) && (fcntl (redirector, F_GETFD, 0) != -1))
- add_undo_redirect (redirector);
+ redirector = fcntl (fd, F_DUPFD, SHELL_FD_BASE); /* XXX try this for now */
+ r = errno;
+ if (redirector < 0)
+ sys_error (_("redirection error: cannot duplicate fd"));
+ REDIRECTION_ERROR (redirector, r, fd);
+ }
+
+ if ((flags & RX_UNDOABLE) && ((redirect->rflags & REDIR_VARASSIGN) == 0 || varassign_redir_autoclose))
+ {
+ /* Only setup to undo it if the thing to undo is active. We want
+ to autoclose if we are doing a varassign redirection and the
+ varredir_close shell option is set, and we can't test
+ redirector in this case since we just assigned it above. */
+ if (fd != redirector && (redirect->rflags & REDIR_VARASSIGN) && varassign_redir_autoclose)
+ r = add_undo_close_redirect (redirector);
+ else if ((fd != redirector) && (fcntl (redirector, F_GETFD, 0) != -1))
+ r = add_undo_redirect (redirector, ri, -1);
else
- add_undo_close_redirect (redirector);
+ r = add_undo_close_redirect (redirector);
+ REDIRECTION_ERROR (r, errno, fd);
}
#if defined (BUFFERED_INPUT)
- check_bash_input (redirector);
+ /* inhibit call to sync_buffered_stream() for async processes */
+ if (redirector != 0 || (subshell_environment & SUBSHELL_ASYNC) == 0)
+ check_bash_input (redirector);
#endif
- if ((fd != redirector) && (dup2 (fd, redirector) < 0))
- return (errno);
+ /* Make sure there is no pending output before we change the state
+ of the underlying file descriptor, since the builtins use stdio
+ for output. */
+ if (redirector == 1 && fileno (stdout) == redirector)
+ {
+ fflush (stdout);
+ fpurge (stdout);
+ }
+ else if (redirector == 2 && fileno (stderr) == redirector)
+ {
+ fflush (stderr);
+ fpurge (stderr);
+ }
+
+ if (redirect->rflags & REDIR_VARASSIGN)
+ {
+ if ((r = redir_varassign (redirect, redirector)) < 0)
+ {
+ close (redirector);
+ close (fd);
+ return (r); /* XXX */
+ }
+ }
+ else if ((fd != redirector) && (dup2 (fd, redirector) < 0))
+ {
+ close (fd); /* dup2 failed? must be fd limit issue */
+ return (errno);
+ }
#if defined (BUFFERED_INPUT)
/* Do not change the buffered stream for an implicit redirection
* both sh and ksh leave the file descriptors open across execs.
* The Posix standard mentions only the exec builtin.
*/
- if (set_clexec && (redirector > 2))
+ if ((flags & RX_CLEXEC) && (redirector > 2))
SET_CLOSE_ON_EXEC (redirector);
}
}
/* If we are hacking both stdout and stderr, do the stderr
- redirection here. */
- if (ri == r_err_and_out)
+ redirection here. XXX - handle {var} here? */
+ if (ri == r_err_and_out || ri == r_append_err_and_out)
{
- if (for_real)
+ if (flags & RX_ACTIVE)
{
- if (remembering)
- add_undo_redirect (2);
+ if (flags & RX_UNDOABLE)
+ add_undo_redirect (2, ri, -1);
if (dup2 (1, 2) < 0)
return (errno);
}
return (HEREDOC_REDIRECT);
}
- if (for_real)
+ if (redirect->rflags & REDIR_VARASSIGN)
+ {
+ redirector = fcntl (fd, F_DUPFD, SHELL_FD_BASE); /* XXX try this for now */
+ r = errno;
+ if (redirector < 0)
+ sys_error (_("redirection error: cannot duplicate fd"));
+ REDIRECTION_ERROR (redirector, r, fd);
+ }
+
+ if (flags & RX_ACTIVE)
{
- if (remembering)
+ if ((flags & RX_UNDOABLE) && ((redirect->rflags & REDIR_VARASSIGN) == 0 || varassign_redir_autoclose))
{
- /* Only setup to undo it if the thing to undo is active. */
- if ((fd != redirector) && (fcntl (redirector, F_GETFD, 0) != -1))
- add_undo_redirect (redirector);
+ /* Only setup to undo it if the thing to undo is active.
+ Close if the right option is set and we are doing a
+ varassign redirection. */
+ if (fd != redirector && (redirect->rflags & REDIR_VARASSIGN) && varassign_redir_autoclose)
+ r = add_undo_close_redirect (redirector);
+ else if ((fd != redirector) && (fcntl (redirector, F_GETFD, 0) != -1))
+ r = add_undo_redirect (redirector, ri, -1);
else
- add_undo_close_redirect (redirector);
+ r = add_undo_close_redirect (redirector);
+ REDIRECTION_ERROR (r, errno, fd);
}
#if defined (BUFFERED_INPUT)
check_bash_input (redirector);
#endif
- if (fd != redirector && dup2 (fd, redirector) < 0)
+ if (redirect->rflags & REDIR_VARASSIGN)
+ {
+ if ((r = redir_varassign (redirect, redirector)) < 0)
+ {
+ close (redirector);
+ close (fd);
+ return (r); /* XXX */
+ }
+ }
+ else if (fd != redirector && dup2 (fd, redirector) < 0)
{
r = errno;
close (fd);
duplicate_buffered_stream (fd, redirector);
#endif
- if (set_clexec && (redirector > 2))
+ if ((flags & RX_CLEXEC) && (redirector > 2))
SET_CLOSE_ON_EXEC (redirector);
}
case r_duplicating_output:
case r_move_input:
case r_move_output:
- if (for_real && (redir_fd != redirector))
+ if ((flags & RX_ACTIVE) && (redirect->rflags & REDIR_VARASSIGN))
+ {
+ redirector = fcntl (redir_fd, F_DUPFD, SHELL_FD_BASE); /* XXX try this for now */
+ r = errno;
+ if (redirector < 0)
+ sys_error (_("redirection error: cannot duplicate fd"));
+ REDIRECTION_ERROR (redirector, r, -1);
+ }
+
+ if ((flags & RX_ACTIVE) && (redir_fd != redirector))
{
- if (remembering)
+ if ((flags & RX_UNDOABLE) && ((redirect->rflags & REDIR_VARASSIGN) == 0 || varassign_redir_autoclose))
{
- /* Only setup to undo it if the thing to undo is active. */
- if (fcntl (redirector, F_GETFD, 0) != -1)
- add_undo_redirect (redirector);
+ /* Only setup to undo it if the thing to undo is active.
+ Close if the right option is set and we are doing a
+ varassign redirection. */
+ if ((redirect->rflags & REDIR_VARASSIGN) && varassign_redir_autoclose)
+ r = add_undo_close_redirect (redirector);
+ else if (fcntl (redirector, F_GETFD, 0) != -1)
+ r = add_undo_redirect (redirector, ri, redir_fd);
else
- add_undo_close_redirect (redirector);
+ r = add_undo_close_redirect (redirector);
+ REDIRECTION_ERROR (r, errno, -1);
+ }
+ if ((flags & RX_UNDOABLE) && (ri == r_move_input || ri == r_move_output))
+ {
+ /* r_move_input and r_move_output add an additional close()
+ that needs to be undone */
+ if (fcntl (redirector, F_GETFD, 0) != -1)
+ {
+ r = add_undo_redirect (redir_fd, r_close_this, -1);
+ REDIRECTION_ERROR (r, errno, -1);
+ }
}
-
#if defined (BUFFERED_INPUT)
- check_bash_input (redirector);
+ /* inhibit call to sync_buffered_stream() for async processes */
+ if (redirector != 0 || (subshell_environment & SUBSHELL_ASYNC) == 0)
+ check_bash_input (redirector);
#endif
+ if (redirect->rflags & REDIR_VARASSIGN)
+ {
+ if ((r = redir_varassign (redirect, redirector)) < 0)
+ {
+ close (redirector);
+ return (r); /* XXX */
+ }
+ }
/* This is correct. 2>&1 means dup2 (1, 2); */
- if (dup2 (redir_fd, redirector) < 0)
+ else if (dup2 (redir_fd, redirector) < 0)
return (errno);
#if defined (BUFFERED_INPUT)
leaves the flag unset on the new descriptor, which means it
stays open. Only set the close-on-exec bit for file descriptors
greater than 2 in any case, since 0-2 should always be open
- unless closed by something like `exec 2<&-'. */
+ unless closed by something like `exec 2<&-'. It should always
+ be safe to set fds > 2 to close-on-exec if they're being used to
+ save file descriptors < 2, since we don't need to preserve the
+ state of the close-on-exec flag for those fds -- they should
+ always be open. */
/* if ((already_set || set_unconditionally) && (ok_to_set))
set_it () */
- if (((fcntl (redir_fd, F_GETFD, 0) == 1) || set_clexec) &&
+#if 0
+ if (((fcntl (redir_fd, F_GETFD, 0) == 1) || redir_fd < 2 || (flags & RX_CLEXEC)) &&
(redirector > 2))
+#else
+ if (((fcntl (redir_fd, F_GETFD, 0) == 1) || (redir_fd < 2 && (flags & RX_INTERNAL)) || (flags & RX_CLEXEC)) &&
+ (redirector > 2))
+#endif
SET_CLOSE_ON_EXEC (redirector);
+ /* When undoing saving of non-standard file descriptors (>=3) using
+ file descriptors >= SHELL_FD_BASE, we set the saving fd to be
+ close-on-exec and use a flag to decide how to set close-on-exec
+ when the fd is restored. */
+ if ((redirect->flags & RX_INTERNAL) && (redirect->flags & RX_SAVCLEXEC) && redirector >= 3 && (redir_fd >= SHELL_FD_BASE || (redirect->flags & RX_SAVEFD)))
+ SET_OPEN_ON_EXEC (redirector);
+
/* dup-and-close redirection */
if (ri == r_move_input || ri == r_move_output)
- close (redir_fd);
+ {
+ xtrace_fdchk (redir_fd);
+
+ close (redir_fd);
+#if defined (COPROCESS_SUPPORT)
+ coproc_fdchk (redir_fd); /* XXX - loses coproc fds */
+#endif
+ }
}
break;
case r_close_this:
- if (for_real)
+ if (flags & RX_ACTIVE)
{
- if (remembering && (fcntl (redirector, F_GETFD, 0) != -1))
- add_undo_redirect (redirector);
+ if (redirect->rflags & REDIR_VARASSIGN)
+ {
+ redirector = redir_varvalue (redirect);
+ if (redirector < 0)
+ return AMBIGUOUS_REDIRECT;
+ }
+
+ r = 0;
+ if (flags & RX_UNDOABLE)
+ {
+ if (fcntl (redirector, F_GETFD, 0) != -1)
+ r = add_undo_redirect (redirector, ri, -1);
+ else
+ r = add_undo_close_redirect (redirector);
+ REDIRECTION_ERROR (r, errno, redirector);
+ }
+
+#if defined (COPROCESS_SUPPORT)
+ coproc_fdchk (redirector);
+#endif
+ xtrace_fdchk (redirector);
#if defined (BUFFERED_INPUT)
- check_bash_input (redirector);
- close_buffered_fd (redirector);
+ /* inhibit call to sync_buffered_stream() for async processes */
+ if (redirector != 0 || (subshell_environment & SUBSHELL_ASYNC) == 0)
+ check_bash_input (redirector);
+ r = close_buffered_fd (redirector);
#else /* !BUFFERED_INPUT */
- close (redirector);
+ r = close (redirector);
#endif /* !BUFFERED_INPUT */
+
+ if (r < 0 && (flags & RX_INTERNAL) && (errno == EIO || errno == ENOSPC))
+ REDIRECTION_ERROR (r, errno, -1);
}
break;
case r_duplicating_input_word:
case r_duplicating_output_word:
+ case r_move_input_word:
+ case r_move_output_word:
break;
}
return (0);
}
-#define SHELL_FD_BASE 10
-
/* Remember the file descriptor associated with the slot FD,
on REDIRECTION_UNDO_LIST. Note that the list will be reversed
before it is executed. Any redirections that need to be undone
even if REDIRECTION_UNDO_LIST is discarded by the exec builtin
- are also saved on EXEC_REDIRECTION_UNDO_LIST. */
+ are also saved on EXEC_REDIRECTION_UNDO_LIST. FDBASE says where to
+ start the duplicating. If it's less than SHELL_FD_BASE, we're ok,
+ and can use SHELL_FD_BASE (-1 == don't care). If it's >= SHELL_FD_BASE,
+ we have to make sure we don't use fdbase to save a file descriptor,
+ since we're going to use it later (e.g., make sure we don't save fd 0
+ to fd 10 if we have a redirection like 0<&10). If the value of fdbase
+ puts the process over its fd limit, causing fcntl to fail, we try
+ again with SHELL_FD_BASE. Return 0 on success, -1 on error. */
static int
-add_undo_redirect (fd)
+add_undo_redirect (fd, ri, fdbase)
int fd;
+ enum r_instruction ri;
+ int fdbase;
{
- int new_fd, clexec_flag;
+ int new_fd, clexec_flag, savefd_flag;
REDIRECT *new_redirect, *closer, *dummy_redirect;
+ REDIRECTEE sd;
- new_fd = fcntl (fd, F_DUPFD, SHELL_FD_BASE);
+ savefd_flag = 0;
+ new_fd = fcntl (fd, F_DUPFD, (fdbase < SHELL_FD_BASE) ? SHELL_FD_BASE : fdbase+1);
+ if (new_fd < 0)
+ new_fd = fcntl (fd, F_DUPFD, SHELL_FD_BASE);
+ if (new_fd < 0)
+ {
+ new_fd = fcntl (fd, F_DUPFD, 0);
+ savefd_flag = 1;
+ }
if (new_fd < 0)
{
- sys_error ("redirection error: cannot duplicate fd");
+ sys_error (_("redirection error: cannot duplicate fd"));
return (-1);
}
clexec_flag = fcntl (fd, F_GETFD, 0);
+ sd.dest = new_fd;
rd.dest = 0;
- closer = make_redirection (new_fd, r_close_this, rd);
+ closer = make_redirection (sd, r_close_this, rd, 0);
+ closer->flags |= RX_INTERNAL;
dummy_redirect = copy_redirects (closer);
+ sd.dest = fd;
rd.dest = new_fd;
if (fd == 0)
- new_redirect = make_redirection (fd, r_duplicating_input, rd);
+ new_redirect = make_redirection (sd, r_duplicating_input, rd, 0);
else
- new_redirect = make_redirection (fd, r_duplicating_output, rd);
+ new_redirect = make_redirection (sd, r_duplicating_output, rd, 0);
+ new_redirect->flags |= RX_INTERNAL;
+ if (savefd_flag)
+ new_redirect->flags |= RX_SAVEFD;
+ if (clexec_flag == 0 && fd >= 3 && (new_fd >= SHELL_FD_BASE || savefd_flag))
+ new_redirect->flags |= RX_SAVCLEXEC;
new_redirect->next = closer;
closer->next = redirection_undo_list;
is thrown away by the `exec' builtin. */
add_exec_redirect (dummy_redirect);
+ /* experimental: if we're saving a redirection to undo for a file descriptor
+ above SHELL_FD_BASE, add a redirection to be undone if the exec builtin
+ causes redirections to be discarded. There needs to be a difference
+ between fds that are used to save other fds and then are the target of
+ user redirections and fds that are just the target of user redirections.
+ We use the close-on-exec flag to tell the difference; fds > SHELL_FD_BASE
+ that have the close-on-exec flag set are assumed to be fds used internally
+ to save others. */
+ if (fd >= SHELL_FD_BASE && ri != r_close_this && clexec_flag)
+ {
+ sd.dest = fd;
+ rd.dest = new_fd;
+ new_redirect = make_redirection (sd, r_duplicating_output, rd, 0);
+ new_redirect->flags |= RX_INTERNAL;
+
+ add_exec_redirect (new_redirect);
+ }
+
/* File descriptors used only for saving others should always be
marked close-on-exec. Unfortunately, we have to preserve the
close-on-exec state of the file descriptor we are saving, since
and the restore above in do_redirection() will take care of it. */
if (clexec_flag || fd < 3)
SET_CLOSE_ON_EXEC (new_fd);
+ else if (redirection_undo_list->flags & RX_SAVCLEXEC)
+ SET_CLOSE_ON_EXEC (new_fd);
return (0);
}
/* Set up to close FD when we are finished with the current command
- and its redirections. */
-static void
+ and its redirections. Return 0 on success, -1 on error. */
+static int
add_undo_close_redirect (fd)
int fd;
{
REDIRECT *closer;
+ REDIRECTEE sd;
+ sd.dest = fd;
rd.dest = 0;
- closer = make_redirection (fd, r_close_this, rd);
+ closer = make_redirection (sd, r_close_this, rd, 0);
+ closer->flags |= RX_INTERNAL;
closer->next = redirection_undo_list;
redirection_undo_list = closer;
+
+ return 0;
}
static void
case r_appending_to:
case r_duplicating_output:
case r_err_and_out:
+ case r_append_err_and_out:
case r_output_force:
case r_duplicating_output_word:
+ case r_move_input:
+ case r_move_output:
+ case r_move_input_word:
+ case r_move_output_word:
return (0);
}
return (0);
int n;
for (n = 0, rp = redirs; rp; rp = rp->next)
- n += stdin_redirection (rp->instruction, rp->redirector);
+ if ((rp->rflags & REDIR_VARASSIGN) == 0)
+ n += stdin_redirection (rp->instruction, rp->redirector.dest);
return n;
}
+/* bind_var_to_int handles array references */
+static int
+redir_varassign (redir, fd)
+ REDIRECT *redir;
+ int fd;
+{
+ WORD_DESC *w;
+ SHELL_VAR *v;
+
+ w = redir->redirector.filename;
+ v = bind_var_to_int (w->word, fd, 0);
+ if (v == 0 || readonly_p (v) || noassign_p (v))
+ return BADVAR_REDIRECT;
+
+ stupidly_hack_special_variables (w->word);
+ return 0;
+}
+
+/* Handles {array[ind]} for redirection words */
+static int
+redir_varvalue (redir)
+ REDIRECT *redir;
+{
+ SHELL_VAR *v;
+ char *val, *w;
+ intmax_t vmax;
+ int i;
+#if defined (ARRAY_VARS)
+ char *sub;
+ int len, vr;
+#endif
+
+ w = redir->redirector.filename->word; /* shorthand */
+ /* XXX - handle set -u here? */
+#if defined (ARRAY_VARS)
+ if (vr = valid_array_reference (w, 0))
+ {
+ v = array_variable_part (w, 0, &sub, &len);
+ }
+ else
+#endif
+ {
+ v = find_variable (w);
+#if defined (ARRAY_VARS)
+ if (v == 0)
+ {
+ v = find_variable_last_nameref (w, 0);
+ if (v && nameref_p (v))
+ {
+ w = nameref_cell (v);
+ if (vr = valid_array_reference (w, 0))
+ v = array_variable_part (w, 0, &sub, &len);
+ else
+ v = find_variable (w);
+ }
+ }
+#endif
+ }
+
+ if (v == 0 || invisible_p (v))
+ return -1;
+
+#if defined (ARRAY_VARS)
+ /* get_variable_value handles references to array variables without
+ subscripts */
+ if (vr && (array_p (v) || assoc_p (v)))
+ val = get_array_value (w, 0, (array_eltstate_t *)NULL);
+ else
+#endif
+ val = get_variable_value (v);
+ if (val == 0 || *val == 0)
+ return -1;
+
+ if (legal_number (val, &vmax) < 0)
+ return -1;
+
+ i = vmax; /* integer truncation */
+ return i;
+}
projects / thirdparty / bash.git / blobdiff