/* redir.c -- Functions to perform input and output redirection. */
-/* Copyright (C) 1997-2009 Free Software Foundation, Inc.
+/* Copyright (C) 1997-2012 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
int expanding_redir;
extern int posixly_correct;
+extern int last_command_exit_value;
+extern int executing_builtin;
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, enum r_instruction, int));
+static int add_undo_close_redirect __P((int));
static int expandable_redirection_filename __P((REDIRECT *));
static int stdin_redirection __P((enum r_instruction, int));
static int undoablefd __P((int));
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); \
+ last_command_exit_value = EXECUTION_FAILURE;\
+ return ((e) == 0 ? EINVAL : (e));\
+ } \
+} while (0)
+
void
redirection_error (temp, error)
REDIRECT *temp;
allocname = 0;
if (temp->rflags & REDIR_VARASSIGN)
- filename = savestring (temp->redirector.filename->word);
+ filename = allocname = savestring (temp->redirector.filename->word);
else if (temp->redirector.dest < 0)
/* This can happen when read_token_word encounters overflow, like in
exec 4294967297>x */
else if (expandable_redirection_filename (temp))
{
expandable_filename:
+ 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);
/* Perform the redirections on LIST. If flags & RX_ACTIVE, then actually
make input and output file descriptors, otherwise just do whatever is
- neccessary for side effecting. flags & RX_UNDOABLE says to remember
+ 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. */
char *result;
WORD_LIST *tlist1, *tlist2;
WORD_DESC *w;
+ int old;
w = copy_word (word);
if (posixly_correct)
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. */
WORD_DESC *redirectee;
{
char *herestr;
- int herelen, n, e;
+ int herelen, n, e, old;
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");
herestr = expand_string_to_string (redirectee->word, 0);
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;
+
herelen = STRLEN (herestr);
n = write (fd, herestr, herelen);
WORD_DESC *redirectee;
{
char *document;
- int document_len, fd2;
+ int document_len, fd2, old;
FILE *fp;
register WORD_LIST *t, *tlist;
}
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");
tlist = expand_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;
if (tlist)
{
/* 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)
{
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;
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;
+ errno = e;
+ }
+ while (fd < 0 && errno == EINTR);
+
#if defined (AFS)
if ((fd < 0) && (errno == EACCES))
{
/* Do the specific redirection requested. Returns errno or one of the
special redirection errors (*_REDIRECT) in case of error, 0 on success.
- If flags & RX_ACTIVE is zero, then just do whatever is neccessary to
+ 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
if (flags & RX_ACTIVE)
{
if (redirect->rflags & REDIR_VARASSIGN)
- redirector = fcntl (fd, F_DUPFD, SHELL_FD_BASE); /* XXX try this for now */
+ {
+ 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)
+ if ((flags & RX_UNDOABLE) && (redirect->rflags & REDIR_VARASSIGN) == 0)
{
/* 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, ri, -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
/* Make sure there is no pending output before we change the state
}
if (redirect->rflags & REDIR_VARASSIGN)
- redirector = fcntl (fd, F_DUPFD, SHELL_FD_BASE); /* XXX try this for now */
+ {
+ 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 (flags & RX_UNDOABLE)
+ if ((flags & RX_UNDOABLE) && (redirect->rflags & REDIR_VARASSIGN) == 0)
{
/* 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, ri, -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)
case r_move_input:
case r_move_output:
if ((flags & RX_ACTIVE) && (redirect->rflags & REDIR_VARASSIGN))
- redirector = fcntl (redir_fd, F_DUPFD, SHELL_FD_BASE); /* XXX try this for now */
+ {
+ 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 (flags & RX_UNDOABLE)
+ if ((flags & RX_UNDOABLE) && (redirect->rflags & REDIR_VARASSIGN) == 0)
{
/* Only setup to undo it if the thing to undo is active. */
if (fcntl (redirector, F_GETFD, 0) != -1)
- add_undo_redirect (redirector, ri, redir_fd);
+ 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)
{
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)
+ 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 */
return AMBIGUOUS_REDIRECT;
}
+ r = 0;
+ /* XXX - only if REDIR_VARASSIGN not set? */
if ((flags & RX_UNDOABLE) && (fcntl (redirector, F_GETFD, 0) != -1))
- add_undo_redirect (redirector, ri, -1);
+ {
+ r = add_undo_redirect (redirector, ri, -1);
+ REDIRECTION_ERROR (r, errno, redirector);
+ }
#if defined (COPROCESS_SUPPORT)
coproc_fdchk (redirector);
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;
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. */
+ again with SHELL_FD_BASE. Return 0 on success, -1 on error. */
static int
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;
+ 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)
{
else
new_redirect = make_redirection (sd, r_duplicating_output, rd, 0);
new_redirect->flags |= RX_INTERNAL;
- if (clexec_flag == 0 && fd >= 3 && new_fd >= SHELL_FD_BASE)
+ 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;
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 redirctions and fds that are just the target of user redirections.
+ 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. */
}
/* 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;
{
closer->flags |= RX_INTERNAL;
closer->next = redirection_undo_list;
redirection_undo_list = closer;
+
+ return 0;
}
static void
n += stdin_redirection (rp->instruction, rp->redirector.dest);
return n;
}
-
-/* These don't yet handle array references */
+/* bind_var_to_int handles array references */
static int
redir_varassign (redir, fd)
REDIRECT *redir;
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;
+ 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? */
- v = find_variable (redir->redirector.filename->word);
+#if defined (ARRAY_VARS)
+ if (vr = valid_array_reference (w))
+ v = array_variable_part (w, &sub, &len);
+ else
+#endif
+ v = find_variable (w);
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, (int *)NULL, (arrayind_t *)0);
+ else
+#endif
val = get_variable_value (v);
if (val == 0 || *val == 0)
return -1;
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