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io.c
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io.c
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/*
* io.c --- routines for dealing with input and output and records
*/
/*
* Copyright (C) 1986, 1988, 1989, 1991-2011 the Free Software Foundation, Inc.
*
* This file is part of GAWK, the GNU implementation of the
* AWK Programming Language.
*
* GAWK 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.
*
* GAWK 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
/* For OSF/1 to get struct sockaddr_storage */
#if defined(__osf__) && !defined(_OSF_SOURCE)
#define _OSF_SOURCE
#endif
#include "awk.h"
#ifdef HAVE_SYS_PARAM_H
#undef RE_DUP_MAX /* avoid spurious conflict w/regex.h */
#include <sys/param.h>
#endif /* HAVE_SYS_PARAM_H */
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif /* HAVE_SYS_IOCTL_H */
#ifndef O_ACCMODE
#define O_ACCMODE (O_RDONLY|O_WRONLY|O_RDWR)
#endif
#ifdef HAVE_TERMIOS_H
#include <termios.h>
#endif
#ifdef HAVE_STROPTS_H
#include <stropts.h>
#endif
#ifdef HAVE_SOCKETS
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#else
#include <socket.h>
#endif /* HAVE_SYS_SOCKET_H */
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#else /* ! HAVE_NETINET_IN_H */
#include <in.h>
#endif /* HAVE_NETINET_IN_H */
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif /* HAVE_NETDB_H */
#if defined(HAVE_POPEN_H)
#include "popen.h"
#endif
#ifndef HAVE_GETADDRINFO
#include "missing_d/getaddrinfo.h"
#endif
#ifndef AI_ADDRCONFIG /* not everyone has this symbol */
#define AI_ADDRCONFIG 0
#endif /* AI_ADDRCONFIG */
#ifndef HAVE_SOCKADDR_STORAGE
#define sockaddr_storage sockaddr /* for older systems */
#endif /* HAVE_SOCKADDR_STORAGE */
#endif /* HAVE_SOCKETS */
#ifndef AF_UNSPEC
#define AF_UNSPEC 0
#endif
#ifndef AF_INET
#define AF_INET 2
#endif
#ifndef AF_INET6
#define AF_INET6 10
#endif
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
#ifdef __EMX__
#include <process.h>
#endif
#ifndef ENFILE
#define ENFILE EMFILE
#endif
#ifdef HAVE_SOCKETS
#ifndef SHUT_RD
#define SHUT_RD 0
#endif
#ifndef SHUT_WR
#define SHUT_WR 1
#endif
#ifndef SHUT_RDWR
#define SHUT_RDWR 2
#endif
#endif /* HAVE_SOCKETS */
#if defined(GAWK_AIX)
#undef TANDEM /* AIX defines this in one of its header files */
#endif
#if defined(__DJGPP__) || defined(__MINGW32__)
#define PIPES_SIMULATED
#endif
#ifdef HAVE_MPFR
/* increment NR or FNR */
#define INCREMENT_REC(X) (do_mpfr && X == (LONG_MAX - 1)) ? \
(mpz_add_ui(M##X, M##X, 1), X = 0) : X++
#else
#define INCREMENT_REC(X) X++
#endif
typedef enum { CLOSE_ALL, CLOSE_TO, CLOSE_FROM } two_way_close_type;
/* Several macros to make the code a bit clearer. */
#define at_eof(iop) (((iop)->flag & IOP_AT_EOF) != 0)
#define has_no_data(iop) ((iop)->dataend == NULL)
#define no_data_left(iop) ((iop)->off >= (iop)->dataend)
/*
* The key point to the design is to split out the code that searches through
* a buffer looking for the record and the terminator into separate routines,
* with a higher-level routine doing the reading of data and buffer management.
* This makes the code easier to manage; the buffering code is the same
* independent of how we find a record. Communication is via the return
* value:
*/
typedef enum recvalues {
REC_OK, /* record and terminator found, recmatch struct filled in */
NOTERM, /* no terminator found, give me more input data */
TERMATEND, /* found terminator at end of buffer */
TERMNEAREND /* found terminator close to end of buffer, for when
the RE might be match more data further in
the file. */
} RECVALUE;
/*
* Between calls to a scanning routine, the state is stored in
* an enum scanstate variable. Not all states apply to all
* variants, but the higher code doesn't really care.
*/
typedef enum scanstate {
NOSTATE, /* scanning not started yet (all) */
INLEADER, /* skipping leading data (RS = "") */
INDATA, /* in body of record (all) */
INTERM /* scanning terminator (RS = "", RS = regexp) */
} SCANSTATE;
/*
* When a record is seen (REC_OK or TERMATEND), the following
* structure is filled in.
*/
struct recmatch {
char *start; /* record start */
size_t len; /* length of record */
char *rt_start; /* start of terminator */
size_t rt_len; /* length of terminator */
};
static int iop_close(IOBUF *iop);
struct redirect *redirect(NODE *redir_exp, int redirtype, int *errflg);
static void close_one(void);
static int close_redir(struct redirect *rp, bool exitwarn, two_way_close_type how);
#ifndef PIPES_SIMULATED
static int wait_any(int interesting);
#endif
static IOBUF *gawk_popen(const char *cmd, struct redirect *rp);
static IOBUF *iop_alloc(int fd, const char *name, int errno_val);
static IOBUF *iop_finish(IOBUF *iop);
static int gawk_pclose(struct redirect *rp);
static int str2mode(const char *mode);
static int two_way_open(const char *str, struct redirect *rp);
static int pty_vs_pipe(const char *command);
static void find_input_parser(IOBUF *iop);
static bool find_output_wrapper(awk_output_buf_t *outbuf);
static void init_output_wrapper(awk_output_buf_t *outbuf);
static bool find_two_way_processor(const char *name, struct redirect *rp);
static RECVALUE rs1scan(IOBUF *iop, struct recmatch *recm, SCANSTATE *state);
static RECVALUE rsnullscan(IOBUF *iop, struct recmatch *recm, SCANSTATE *state);
static RECVALUE rsrescan(IOBUF *iop, struct recmatch *recm, SCANSTATE *state);
static RECVALUE (*matchrec)(IOBUF *iop, struct recmatch *recm, SCANSTATE *state) = rs1scan;
static int get_a_record(char **out, IOBUF *iop, int *errcode);
static void free_rp(struct redirect *rp);
static int inetfile(const char *str, int *length, int *family);
static NODE *in_PROCINFO(const char *pidx1, const char *pidx2, NODE **full_idx);
static long get_read_timeout(IOBUF *iop);
static ssize_t read_with_timeout(int fd, char *buf, size_t size);
static bool read_can_timeout = false;
static long read_timeout;
static long read_default_timeout;
static struct redirect *red_head = NULL;
static NODE *RS = NULL;
static Regexp *RS_re_yes_case; /* regexp for RS when ignoring case */
static Regexp *RS_re_no_case; /* regexp for RS when not ignoring case */
static Regexp *RS_regexp;
bool RS_is_null;
extern NODE *ARGC_node;
extern NODE *ARGV_node;
extern NODE *ARGIND_node;
extern NODE **fields_arr;
/* init_io --- set up timeout related variables */
void
init_io()
{
long tmout;
/*
* N.B.: all these hacks are to minimize the effect
* on programs that do not care about timeout.
*/
/* Parse the env. variable only once */
tmout = getenv_long("GAWK_READ_TIMEOUT");
if (tmout > 0) {
read_default_timeout = tmout;
read_can_timeout = true;
}
/*
* PROCINFO entries for timeout are dynamic;
* We can't be any more specific than this.
*/
if (PROCINFO_node != NULL)
read_can_timeout = true;
}
#if defined(__DJGPP__) || defined(__MINGW32__) || defined(__EMX__) || defined(__CYGWIN__)
/* binmode --- convert BINMODE to string for fopen */
static const char *
binmode(const char *mode)
{
switch (mode[0]) {
case 'r':
if ((BINMODE & 1) != 0)
mode = "rb";
break;
case 'w':
case 'a':
if ((BINMODE & 2) != 0)
mode = (mode[0] == 'w' ? "wb" : "ab");
break;
}
return mode;
}
#else
#define binmode(mode) (mode)
#endif
#ifdef VMS
/* File pointers have an extra level of indirection, and there are cases where
`stdin' can be null. That can crash gawk if fileno() is used as-is. */
static int vmsrtl_fileno(FILE *);
static int vmsrtl_fileno(fp) FILE *fp; { return fileno(fp); }
#undef fileno
#define fileno(FP) (((FP) && *(FP)) ? vmsrtl_fileno(FP) : -1)
#endif /* VMS */
/* after_beginfile --- reset necessary state after BEGINFILE has run */
void
after_beginfile(IOBUF **curfile)
{
IOBUF *iop;
iop = *curfile;
assert(iop != NULL);
/*
* Input parsers could have been changed by BEGINFILE,
* so delay check until now.
*/
find_input_parser(iop);
if (! iop->valid) {
const char *fname;
int errcode;
bool valid;
fname = iop->public.name;
errcode = iop->errcode;
valid = iop->valid;
errno = 0;
update_ERRNO_int(errcode);
iop_close(iop);
*curfile = NULL;
if (! valid && errcode == EISDIR && ! do_traditional) {
warning(_("command line argument `%s' is a directory: skipped"), fname);
return; /* read next file */
}
fatal(_("cannot open file `%s' for reading (%s)"),
fname, strerror(errcode));
}
}
/* nextfile --- move to the next input data file */
/*
* Return value > 0 ----> run BEGINFILE block
* *curfile = NULL ----> hit EOF, run ENDFILE block
*/
int
nextfile(IOBUF **curfile, bool skipping)
{
static long i = 1;
static bool files = false;
NODE *arg, *tmp;
const char *fname;
int fd = INVALID_HANDLE;
int errcode = 0;
IOBUF *iop = *curfile;
long argc;
if (skipping) { /* for 'nextfile' call */
errcode = 0;
if (iop != NULL) {
errcode = iop->errcode;
(void) iop_close(iop);
}
*curfile = NULL;
return (errcode == 0);
}
if (iop != NULL) {
if (at_eof(iop)) {
assert(iop->public.fd != INVALID_HANDLE);
(void) iop_close(iop);
*curfile = NULL;
return 1; /* run endfile block */
} else
return 0;
}
argc = get_number_si(ARGC_node->var_value);
for (; i < argc; i++) {
tmp = make_number((AWKNUM) i);
(void) force_string(tmp);
arg = in_array(ARGV_node, tmp);
unref(tmp);
if (arg == NULL || arg->stlen == 0)
continue;
arg = force_string(arg);
arg->stptr[arg->stlen] = '\0';
if (! do_traditional) {
unref(ARGIND_node->var_value);
ARGIND_node->var_value = make_number((AWKNUM) i);
}
if (! arg_assign(arg->stptr, false)) {
files = true;
fname = arg->stptr;
/* manage the awk variables: */
unref(FILENAME_node->var_value);
FILENAME_node->var_value = dupnode(arg);
#ifdef HAVE_MPFR
if (is_mpg_number(FNR_node->var_value))
mpz_set_ui(MFNR, 0);
#endif
FNR = 0;
/* IOBUF management: */
errno = 0;
fd = devopen(fname, binmode("r"));
errcode = errno;
if (! do_traditional)
update_ERRNO_int(errno);
iop = iop_alloc(fd, fname, errcode);
*curfile = iop_finish(iop);
if (iop->public.fd == INVALID_HANDLE)
iop->errcode = errcode;
else if (iop->valid)
iop->errcode = 0;
if (! do_traditional && iop->errcode != 0)
update_ERRNO_int(iop->errcode);
return ++i; /* run beginfile block */
}
}
if (files == false) {
files = true;
/* no args. -- use stdin */
/* FNR is init'ed to 0 */
errno = 0;
if (! do_traditional)
update_ERRNO_int(errno);
unref(FILENAME_node->var_value);
FILENAME_node->var_value = make_string("-", 1);
FILENAME_node->var_value->flags |= MAYBE_NUM; /* be pedantic */
fname = "-";
iop = iop_alloc(fileno(stdin), fname, 0);
*curfile = iop_finish(iop);
if (iop->public.fd == INVALID_HANDLE) {
errcode = errno;
errno = 0;
update_ERRNO_int(errno);
(void) iop_close(iop);
*curfile = NULL;
fatal(_("cannot open file `%s' for reading (%s)"),
fname, strerror(errcode));
}
return ++i; /* run beginfile block */
}
return -1; /* end of input, run end block or Op_atexit */
}
/* set_FNR --- update internal FNR from awk variable */
void
set_FNR()
{
NODE *n = FNR_node->var_value;
(void) force_number(n);
#ifdef HAVE_MPFR
if (is_mpg_number(n))
FNR = mpg_set_var(FNR_node);
else
#endif
FNR = get_number_si(n);
}
/* set_NR --- update internal NR from awk variable */
void
set_NR()
{
NODE *n = NR_node->var_value;
(void) force_number(n);
#ifdef HAVE_MPFR
if (is_mpg_number(n))
NR = mpg_set_var(NR_node);
else
#endif
NR = get_number_si(n);
}
/* inrec --- This reads in a record from the input file */
int
inrec(IOBUF *iop, int *errcode)
{
char *begin;
int cnt;
int retval = 0;
if (at_eof(iop) && no_data_left(iop))
cnt = EOF;
else if ((iop->flag & IOP_CLOSED) != 0)
cnt = EOF;
else
cnt = get_a_record(& begin, iop, errcode);
if (cnt == EOF) {
retval = 1;
if (*errcode > 0)
update_ERRNO_int(*errcode);
} else {
INCREMENT_REC(NR);
INCREMENT_REC(FNR);
set_record(begin, cnt);
}
return retval;
}
/* remap_std_file --- reopen a standard descriptor on /dev/null */
static int
remap_std_file(int oldfd)
{
int newfd;
int ret = -1;
/*
* Give OS-specific routines in gawkmisc.c a chance to interpret
* "/dev/null" as appropriate for their platforms.
*/
newfd = os_devopen("/dev/null", O_RDWR);
if (newfd == INVALID_HANDLE)
newfd = open("/dev/null", O_RDWR);
if (newfd >= 0) {
/* if oldfd is open, dup2() will close oldfd for us first. */
ret = dup2(newfd, oldfd);
if (ret == 0)
close(newfd);
} else
ret = 0;
return ret;
}
/* iop_close --- close an open IOP */
static int
iop_close(IOBUF *iop)
{
int ret = 0;
if (iop == NULL)
return 0;
errno = 0;
iop->flag &= ~IOP_AT_EOF;
iop->flag |= IOP_CLOSED; /* there may be dangling pointers */
iop->dataend = NULL;
/*
* Closing standard files can cause crufty code elsewhere to lose.
* So we remap the standard file to /dev/null.
* Thanks to Jim Meyering for the suggestion.
*/
if (iop->public.close_func != NULL)
iop->public.close_func(&iop->public);
if (iop->public.fd != INVALID_HANDLE) {
if (iop->public.fd == fileno(stdin)
|| iop->public.fd == fileno(stdout)
|| iop->public.fd == fileno(stderr))
ret = remap_std_file(iop->public.fd);
else
ret = close(iop->public.fd);
}
if (ret == -1)
warning(_("close of fd %d (`%s') failed (%s)"), iop->public.fd,
iop->public.name, strerror(errno));
/*
* Be careful -- $0 may still reference the buffer even though
* an explicit close is being done; in the future, maybe we
* can do this a bit better.
*/
if (iop->buf) {
if ((fields_arr[0]->stptr >= iop->buf)
&& (fields_arr[0]->stptr < (iop->buf + iop->size))) {
NODE *t;
t = make_string(fields_arr[0]->stptr,
fields_arr[0]->stlen);
unref(fields_arr[0]);
fields_arr[0] = t;
/*
* This used to be here:
*
* reset_record();
*
* Don't do that; reset_record() throws away all fields,
* saves FS etc. We just need to make sure memory isn't
* corrupted and that references to $0 and fields work.
*/
}
efree(iop->buf);
iop->buf = NULL;
}
efree(iop);
return ret == -1 ? 1 : 0;
}
/* redflags2str --- turn redirection flags into a string, for debugging */
const char *
redflags2str(int flags)
{
static const struct flagtab redtab[] = {
{ RED_FILE, "RED_FILE" },
{ RED_PIPE, "RED_PIPE" },
{ RED_READ, "RED_READ" },
{ RED_WRITE, "RED_WRITE" },
{ RED_APPEND, "RED_APPEND" },
{ RED_NOBUF, "RED_NOBUF" },
{ RED_EOF, "RED_EOF" },
{ RED_TWOWAY, "RED_TWOWAY" },
{ RED_PTY, "RED_PTY" },
{ RED_SOCKET, "RED_SOCKET" },
{ RED_TCP, "RED_TCP" },
{ 0, NULL }
};
return genflags2str(flags, redtab);
}
/* redirect --- Redirection for printf and print commands */
struct redirect *
redirect(NODE *redir_exp, int redirtype, int *errflg)
{
struct redirect *rp;
char *str;
int tflag = 0;
int outflag = 0;
const char *direction = "to";
const char *mode;
int fd;
const char *what = NULL;
bool new_rp = false;
int len; /* used with /inet */
static struct redirect *save_rp = NULL; /* hold onto rp that should
* be freed for reuse
*/
if (do_sandbox)
fatal(_("redirection not allowed in sandbox mode"));
switch (redirtype) {
case redirect_append:
tflag = RED_APPEND;
/* FALL THROUGH */
case redirect_output:
outflag = (RED_FILE|RED_WRITE);
tflag |= outflag;
if (redirtype == redirect_output)
what = ">";
else
what = ">>";
break;
case redirect_pipe:
tflag = (RED_PIPE|RED_WRITE);
what = "|";
break;
case redirect_pipein:
tflag = (RED_PIPE|RED_READ);
what = "|";
break;
case redirect_input:
tflag = (RED_FILE|RED_READ);
what = "<";
break;
case redirect_twoway:
tflag = (RED_READ|RED_WRITE|RED_TWOWAY);
what = "|&";
break;
default:
cant_happen();
}
if (do_lint && (redir_exp->flags & STRCUR) == 0)
lintwarn(_("expression in `%s' redirection only has numeric value"),
what);
redir_exp = force_string(redir_exp);
str = redir_exp->stptr;
if (str == NULL || *str == '\0')
fatal(_("expression for `%s' redirection has null string value"),
what);
if (do_lint && (strncmp(str, "0", redir_exp->stlen) == 0
|| strncmp(str, "1", redir_exp->stlen) == 0))
lintwarn(_("filename `%s' for `%s' redirection may be result of logical expression"),
str, what);
#ifdef HAVE_SOCKETS
/*
* Use /inet4 to force IPv4, /inet6 to force IPv6, and plain
* /inet will be whatever we get back from the system.
*/
if (inetfile(str, & len, NULL)) {
tflag |= RED_SOCKET;
if (strncmp(str + len, "tcp/", 4) == 0)
tflag |= RED_TCP; /* use shutdown when closing */
}
#endif /* HAVE_SOCKETS */
for (rp = red_head; rp != NULL; rp = rp->next) {
#ifndef PIPES_SIMULATED
/*
* This is an efficiency hack. We want to
* recover the process slot for dead children,
* if at all possible. Messing with signal() for
* SIGCLD leads to lots of headaches. However, if
* we've gotten EOF from a child input pipeline, it's
* a good bet that the child has died. So recover it.
*/
if ((rp->flag & RED_EOF) && redirtype == redirect_pipein) {
if (rp->pid != -1)
wait_any(0);
}
#endif /* PIPES_SIMULATED */
/* now check for a match */
if (strlen(rp->value) == redir_exp->stlen
&& memcmp(rp->value, str, redir_exp->stlen) == 0
&& ((rp->flag & ~(RED_NOBUF|RED_EOF|RED_PTY)) == tflag
|| (outflag != 0
&& (rp->flag & (RED_FILE|RED_WRITE)) == outflag))) {
int rpflag = (rp->flag & ~(RED_NOBUF|RED_EOF|RED_PTY));
int newflag = (tflag & ~(RED_NOBUF|RED_EOF|RED_PTY));
if (do_lint && rpflag != newflag)
lintwarn(
_("unnecessary mixing of `>' and `>>' for file `%.*s'"),
(int) redir_exp->stlen, rp->value);
break;
}
}
if (rp == NULL) {
new_rp = true;
if (save_rp != NULL) {
rp = save_rp;
efree(rp->value);
} else
emalloc(rp, struct redirect *, sizeof(struct redirect), "redirect");
emalloc(str, char *, redir_exp->stlen + 1, "redirect");
memcpy(str, redir_exp->stptr, redir_exp->stlen);
str[redir_exp->stlen] = '\0';
rp->value = str;
rp->flag = tflag;
init_output_wrapper(& rp->output);
rp->iop = NULL;
rp->pid = -1;
rp->status = 0;
} else
str = rp->value; /* get \0 terminated string */
save_rp = rp;
while (rp->output.fp == NULL && rp->iop == NULL) {
if (! new_rp && rp->flag & RED_EOF) {
/*
* Encountered EOF on file or pipe -- must be cleared
* by explicit close() before reading more
*/
save_rp = NULL;
return rp;
}
mode = NULL;
errno = 0;
switch (redirtype) {
case redirect_output:
mode = binmode("w");
if ((rp->flag & RED_USED) != 0)
mode = (rp->mode[1] == 'b') ? "ab" : "a";
break;
case redirect_append:
mode = binmode("a");
break;
case redirect_pipe:
/* synchronize output before new pipe */
(void) flush_io();
os_restore_mode(fileno(stdin));
if ((rp->output.fp = popen(str, binmode("w"))) == NULL)
fatal(_("can't open pipe `%s' for output (%s)"),
str, strerror(errno));
/* set close-on-exec */
os_close_on_exec(fileno(rp->output.fp), str, "pipe", "to");
rp->flag |= RED_NOBUF;
break;
case redirect_pipein:
direction = "from";
if (gawk_popen(str, rp) == NULL)
fatal(_("can't open pipe `%s' for input (%s)"),
str, strerror(errno));
break;
case redirect_input:
direction = "from";
fd = devopen(str, binmode("r"));
if (fd == INVALID_HANDLE && errno == EISDIR) {
*errflg = EISDIR;
/* do not free rp, saving it for reuse (save_rp = rp) */
return NULL;
}
rp->iop = iop_alloc(fd, str, errno);
find_input_parser(rp->iop);
iop_finish(rp->iop);
if (! rp->iop->valid) {
if (! do_traditional && rp->iop->errcode != 0)
update_ERRNO_int(rp->iop->errcode);
iop_close(rp->iop);
rp->iop = NULL;
}
break;
case redirect_twoway:
direction = "to/from";
if (! two_way_open(str, rp)) {
#ifdef HAVE_SOCKETS
if (inetfile(str, NULL, NULL)) {
*errflg = errno;
/* do not free rp, saving it for reuse (save_rp = rp) */
return NULL;
} else
#endif
fatal(_("can't open two way pipe `%s' for input/output (%s)"),
str, strerror(errno));
}
break;
default:
cant_happen();
}
if (mode != NULL) {
errno = 0;
rp->output.mode = mode;
fd = devopen(str, mode);
if (fd > INVALID_HANDLE) {
if (fd == fileno(stdin))
rp->output.fp = stdin;
else if (fd == fileno(stdout))
rp->output.fp = stdout;
else if (fd == fileno(stderr))
rp->output.fp = stderr;
else {
const char *omode = mode;
#if defined(F_GETFL) && defined(O_APPEND)
int fd_flags;
fd_flags = fcntl(fd, F_GETFL);
if (fd_flags != -1 && (fd_flags & O_APPEND) == O_APPEND)
omode = binmode("a");
#endif
os_close_on_exec(fd, str, "file", "");
rp->output.fp = fdopen(fd, (const char *) omode);
rp->mode = (const char *) mode;
/* don't leak file descriptors */
if (rp->output.fp == NULL)
close(fd);
}
if (rp->output.fp != NULL && os_isatty(fd))
rp->flag |= RED_NOBUF;
/* Move rp to the head of the list. */
if (! new_rp && red_head != rp) {
if ((rp->prev->next = rp->next) != NULL)
rp->next->prev = rp->prev;
red_head->prev = rp;
rp->prev = NULL;
rp->next = red_head;
red_head = rp;
}
}
find_output_wrapper(& rp->output);
}
if (rp->output.fp == NULL && rp->iop == NULL) {
/* too many files open -- close one and try again */
if (errno == EMFILE || errno == ENFILE)
close_one();
#if defined __MINGW32__
else if (errno == 0) /* HACK! */
close_one();
#endif
#ifdef VMS
/* Alpha/VMS V7.1's C RTL is returning this instead
of EMFILE (haven't tried other post-V6.2 systems) */
#define SS$_EXQUOTA 0x001C
else if (errno == EIO && vaxc$errno == SS$_EXQUOTA)
close_one();
#endif
else {
/*
* Some other reason for failure.
*
* On redirection of input from a file,
* just return an error, so e.g. getline
* can return -1. For output to file,
* complain. The shell will complain on
* a bad command to a pipe.
*/
if (errflg != NULL)
*errflg = errno;
if ( redirtype == redirect_output
|| redirtype == redirect_append) {
/* multiple messages make life easier for translators */
if (*direction == 'f')
fatal(_("can't redirect from `%s' (%s)"),
str, strerror(errno));
else
fatal(_("can't redirect to `%s' (%s)"),
str, strerror(errno));
} else {
/* do not free rp, saving it for reuse (save_rp = rp) */
return NULL;
}
}
}
}
if (new_rp) {
/*
* It opened successfully, hook it into the list.
* Maintain the list in most-recently-used first order.
*/
if (red_head != NULL)
red_head->prev = rp;
rp->prev = NULL;
rp->next = red_head;
red_head = rp;
}
save_rp = NULL;
return rp;
}
/* getredirect --- find the struct redirect for this file or pipe */
struct redirect *
getredirect(const char *str, int len)
{
struct redirect *rp;
for (rp = red_head; rp != NULL; rp = rp->next)
if (strlen(rp->value) == len && memcmp(rp->value, str, len) == 0)
return rp;
return NULL;
}
/* close_one --- temporarily close an open file to re-use the fd */
static void
close_one()
{
struct redirect *rp;
struct redirect *rplast = NULL;
static bool warned = false;
if (do_lint && ! warned) {
warned = true;
lintwarn(_("reached system limit for open files: starting to multiplex file descriptors"));
}
/* go to end of list first, to pick up least recently used entry */
for (rp = red_head; rp != NULL; rp = rp->next)
rplast = rp;
/* now work back up through the list */
for (rp = rplast; rp != NULL; rp = rp->prev) {
/* don't close standard files! */
if (rp->output.fp == NULL || rp->output.fp == stderr || rp->output.fp == stdout)
continue;
if ((rp->flag & (RED_FILE|RED_WRITE)) == (RED_FILE|RED_WRITE)) {
rp->flag |= RED_USED;
errno = 0;
if (rp->output.gawk_fclose(rp->output.fp, rp->output.opaque) != 0)
warning(_("close of `%s' failed (%s)."),
rp->value, strerror(errno));
rp->output.fp = NULL;
break;
}
}
if (rp == NULL)
/* surely this is the only reason ??? */