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- /*
- * io.c --- routines for dealing with input and output and records
- */
-
- /*
- * Copyright (C) 1986, 1988, 1989, 1991, 1992, 1993 the Free Software Foundation, Inc.
- *
- * This file is part of GAWK, the GNU implementation of the
- * AWK Progamming 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 2 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 GAWK; see the file COPYING. If not, write to
- * the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
- #if !defined(VMS) && !defined(VMS_POSIX) && !defined(_MSC_VER)
- #include <sys/param.h>
- #endif
- #include "awk.h"
-
- #ifndef O_RDONLY
- #include <fcntl.h>
- #endif
-
- #if !defined(S_ISDIR) && defined(S_IFDIR)
- #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
- #endif
-
- #ifndef ENFILE
- #define ENFILE EMFILE
- #endif
-
- #ifndef atarist
- #define INVALID_HANDLE (-1)
- #else
- #define INVALID_HANDLE (__SMALLEST_VALID_HANDLE - 1)
- #endif
-
- #if defined(MSDOS) || defined(OS2) || defined(atarist)
- #define PIPES_SIMULATED
- #endif
-
- static IOBUF *nextfile P((int skipping));
- static int inrec P((IOBUF *iop));
- static int iop_close P((IOBUF *iop));
- struct redirect *redirect P((NODE *tree, int *errflg));
- static void close_one P((void));
- static int close_redir P((struct redirect *rp, int exitwarn));
- #ifndef PIPES_SIMULATED
- static int wait_any P((int interesting));
- #endif
- static IOBUF *gawk_popen P((char *cmd, struct redirect *rp));
- static IOBUF *iop_open P((const char *file, const char *how));
- static int gawk_pclose P((struct redirect *rp));
- static int do_pathopen P((const char *file));
- static int str2mode P((const char *mode));
- static void spec_setup P((IOBUF *iop, int len, int allocate));
- static int specfdopen P((IOBUF *iop, const char *name, const char *mode));
- static int pidopen P((IOBUF *iop, const char *name, const char *mode));
- static int useropen P((IOBUF *iop, const char *name, const char *mode));
-
- extern FILE *fdopen();
-
- #if defined (MSDOS)
- #include "popen.h"
- #define popen(c,m) os_popen(c,m)
- #define pclose(f) os_pclose(f)
- #elif defined (OS2) /* OS/2, but not family mode */
- #if defined (_MSC_VER)
- #define popen(c,m) _popen(c,m)
- #define pclose(f) _pclose(f)
- #endif
- #else
- extern FILE *popen();
- #endif
-
- static struct redirect *red_head = NULL;
-
- extern int output_is_tty;
- extern NODE *ARGC_node;
- extern NODE *ARGV_node;
- extern NODE *ARGIND_node;
- extern NODE *ERRNO_node;
- extern NODE **fields_arr;
-
- static jmp_buf filebuf; /* for do_nextfile() */
-
- /* do_nextfile --- implement gawk "next file" extension */
-
- void
- do_nextfile()
- {
- (void) nextfile(1);
- longjmp(filebuf, 1);
- }
-
- static IOBUF *
- nextfile(skipping)
- int skipping;
- {
- static int i = 1;
- static int files = 0;
- NODE *arg;
- static IOBUF *curfile = NULL;
-
- if (skipping) {
- if (curfile != NULL)
- iop_close(curfile);
- curfile = NULL;
- return NULL;
- }
- if (curfile != NULL) {
- if (curfile->cnt == EOF) {
- (void) iop_close(curfile);
- curfile = NULL;
- } else
- return curfile;
- }
- for (; i < (int) (ARGC_node->lnode->numbr); i++) {
- arg = *assoc_lookup(ARGV_node, tmp_number((AWKNUM) i));
- if (arg->stptr[0] == '\0')
- continue;
- arg->stptr[arg->stlen] = '\0';
- if (! do_unix) {
- ARGIND_node->var_value->numbr = i;
- ARGIND_node->var_value->flags = NUM|NUMBER;
- }
- if (!arg_assign(arg->stptr)) {
- files++;
- curfile = iop_open(arg->stptr, "r");
- if (curfile == NULL)
- fatal("cannot open file `%s' for reading (%s)",
- arg->stptr, strerror(errno));
- /* NOTREACHED */
- /* This is a kludge. */
- unref(FILENAME_node->var_value);
- FILENAME_node->var_value = dupnode(arg);
- FNR = 0;
- i++;
- break;
- }
- }
- if (files == 0) {
- files++;
- /* no args. -- use stdin */
- /* FNR is init'ed to 0 */
- FILENAME_node->var_value = make_string("-", 1);
- curfile = iop_alloc(fileno(stdin));
- }
- return curfile;
- }
-
- void
- set_FNR()
- {
- FNR = (long) FNR_node->var_value->numbr;
- }
-
- void
- set_NR()
- {
- NR = (long) NR_node->var_value->numbr;
- }
-
- /*
- * This reads in a record from the input file
- */
- static int
- inrec(iop)
- IOBUF *iop;
- {
- char *begin;
- register int cnt;
- int retval = 0;
-
- cnt = get_a_record(&begin, iop, *RS, NULL);
- if (cnt == EOF) {
- cnt = 0;
- retval = 1;
- } else {
- NR += 1;
- FNR += 1;
- }
- set_record(begin, cnt, 1);
-
- return retval;
- }
-
- static int
- iop_close(iop)
- IOBUF *iop;
- {
- int ret;
-
- if (iop == NULL)
- return 0;
- errno = 0;
-
- #ifdef _CRAY
- /* Work around bug in UNICOS popen */
- if (iop->fd < 3)
- ret = 0;
- else
- #endif
- /* save these for re-use; don't free the storage */
- if ((iop->flag & IOP_IS_INTERNAL) != 0) {
- iop->off = iop->buf;
- iop->end = iop->buf + strlen(iop->buf);
- iop->cnt = 0;
- iop->secsiz = 0;
- return 0;
- }
-
- /* Don't close standard files or else crufty code elsewhere will lose */
- if (iop->fd == fileno(stdin) ||
- iop->fd == fileno(stdout) ||
- iop->fd == fileno(stderr))
- ret = 0;
- else
- ret = close(iop->fd);
- if (ret == -1)
- warning("close of fd %d failed (%s)", iop->fd, strerror(errno));
- if ((iop->flag & IOP_NO_FREE) == 0) {
- /*
- * 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->end)) {
- NODE *t;
-
- t = make_string(fields_arr[0]->stptr,
- fields_arr[0]->stlen);
- unref(fields_arr[0]);
- fields_arr [0] = t;
- reset_record ();
- }
- free(iop->buf);
- }
- free((char *)iop);
- }
- return ret == -1 ? 1 : 0;
- }
-
- void
- do_input()
- {
- IOBUF *iop;
- extern int exiting;
-
- (void) setjmp(filebuf);
-
- while ((iop = nextfile(0)) != NULL) {
- if (inrec(iop) == 0)
- while (interpret(expression_value) && inrec(iop) == 0)
- continue;
- /* recover any space from C based alloca */
- (void) alloca(0);
-
- if (exiting)
- break;
- }
- }
-
- /* Redirection for printf and print commands */
- struct redirect *
- redirect(tree, errflg)
- NODE *tree;
- int *errflg;
- {
- register NODE *tmp;
- register struct redirect *rp;
- register char *str;
- int tflag = 0;
- int outflag = 0;
- const char *direction = "to";
- const char *mode;
- int fd;
- const char *what = NULL;
-
- switch (tree->type) {
- case Node_redirect_append:
- tflag = RED_APPEND;
- /* FALL THROUGH */
- case Node_redirect_output:
- outflag = (RED_FILE|RED_WRITE);
- tflag |= outflag;
- if (tree->type == Node_redirect_output)
- what = ">";
- else
- what = ">>";
- break;
- case Node_redirect_pipe:
- tflag = (RED_PIPE|RED_WRITE);
- what = "|";
- break;
- case Node_redirect_pipein:
- tflag = (RED_PIPE|RED_READ);
- what = "|";
- break;
- case Node_redirect_input:
- tflag = (RED_FILE|RED_READ);
- what = "<";
- break;
- default:
- fatal ("invalid tree type %d in redirect()", tree->type);
- break;
- }
- tmp = tree_eval(tree->subnode);
- if (do_lint && ! (tmp->flags & STR))
- warning("expression in `%s' redirection only has numeric value",
- what);
- tmp = force_string(tmp);
- str = tmp->stptr;
- if (str == NULL || *str == '\0')
- fatal("expression for `%s' redirection has null string value",
- what);
- if (do_lint
- && (STREQN(str, "0", tmp->stlen) || STREQN(str, "1", tmp->stlen)))
- warning("filename `%s' for `%s' redirection may be result of logical expression", str, what);
- for (rp = red_head; rp != NULL; rp = rp->next)
- if (strlen(rp->value) == tmp->stlen
- && STREQN(rp->value, str, tmp->stlen)
- && ((rp->flag & ~(RED_NOBUF|RED_EOF)) == tflag
- || (outflag
- && (rp->flag & (RED_FILE|RED_WRITE)) == outflag)))
- break;
- if (rp == NULL) {
- emalloc(rp, struct redirect *, sizeof(struct redirect),
- "redirect");
- emalloc(str, char *, tmp->stlen+1, "redirect");
- memcpy(str, tmp->stptr, tmp->stlen);
- str[tmp->stlen] = '\0';
- rp->value = str;
- rp->flag = tflag;
- rp->fp = NULL;
- rp->iop = NULL;
- rp->pid = 0; /* unlikely that we're worried about init */
- rp->status = 0;
- /* maintain list in most-recently-used first order */
- if (red_head)
- red_head->prev = rp;
- rp->prev = NULL;
- rp->next = red_head;
- red_head = rp;
- }
- while (rp->fp == NULL && rp->iop == NULL) {
- if (rp->flag & RED_EOF)
- /* encountered EOF on file or pipe -- must be cleared
- * by explicit close() before reading more
- */
- return rp;
- mode = NULL;
- errno = 0;
- switch (tree->type) {
- case Node_redirect_output:
- mode = "w";
- if (rp->flag & RED_USED)
- mode = "a";
- break;
- case Node_redirect_append:
- mode = "a";
- break;
- case Node_redirect_pipe:
- if ((rp->fp = popen(str, "w")) == NULL)
- fatal("can't open pipe (\"%s\") for output (%s)",
- str, strerror(errno));
- rp->flag |= RED_NOBUF;
- break;
- case Node_redirect_pipein:
- direction = "from";
- if (gawk_popen(str, rp) == NULL)
- fatal("can't open pipe (\"%s\") for input (%s)",
- str, strerror(errno));
- break;
- case Node_redirect_input:
- direction = "from";
- rp->iop = iop_open(str, "r");
- break;
- default:
- cant_happen();
- }
- if (mode != NULL) {
- fd = devopen(str, mode);
- if (fd > INVALID_HANDLE) {
- if (fd == fileno(stdin))
- rp->fp = stdin;
- else if (fd == fileno(stdout))
- rp->fp = stdout;
- else if (fd == fileno(stderr))
- rp->fp = stderr;
- else {
- rp->fp = fdopen(fd, (char *) mode);
- /* don't leak file descriptors */
- if (rp->fp == NULL)
- close(fd);
- }
- if (rp->fp != NULL && isatty(fd))
- rp->flag |= RED_NOBUF;
- }
- }
- if (rp->fp == NULL && rp->iop == NULL) {
- /* too many files open -- close one and try again */
- if (errno == EMFILE || errno == ENFILE)
- close_one();
- 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.
- */
- *errflg = errno;
- if (tree->type == Node_redirect_output
- || tree->type == Node_redirect_append)
- fatal("can't redirect %s `%s' (%s)",
- direction, str, strerror(errno));
- else {
- free_temp(tmp);
- return NULL;
- }
- }
- }
- }
- free_temp(tmp);
- return rp;
- }
-
- static void
- close_one()
- {
- register struct redirect *rp;
- register struct redirect *rplast = NULL;
-
- /* 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)
- if (rp->fp && (rp->flag & RED_FILE)) {
- rp->flag |= RED_USED;
- errno = 0;
- if (fclose(rp->fp))
- warning("close of \"%s\" failed (%s).",
- rp->value, strerror(errno));
- rp->fp = NULL;
- break;
- }
- if (rp == NULL)
- /* surely this is the only reason ??? */
- fatal("too many pipes or input files open");
- }
-
- NODE *
- do_close(tree)
- NODE *tree;
- {
- NODE *tmp;
- register struct redirect *rp;
-
- tmp = force_string(tree_eval(tree->subnode));
- for (rp = red_head; rp != NULL; rp = rp->next) {
- if (strlen(rp->value) == tmp->stlen
- && STREQN(rp->value, tmp->stptr, tmp->stlen))
- break;
- }
- free_temp(tmp);
- if (rp == NULL) /* no match */
- return tmp_number((AWKNUM) 0.0);
- fflush(stdout); /* synchronize regular output */
- tmp = tmp_number((AWKNUM)close_redir(rp, 0));
- rp = NULL;
- return tmp;
- }
-
- static int
- close_redir(rp, exitwarn)
- register struct redirect *rp;
- int exitwarn;
- {
- int status = 0;
- char *what;
-
- if (rp == NULL)
- return 0;
- if (rp->fp == stdout || rp->fp == stderr)
- return 0;
- errno = 0;
- if ((rp->flag & (RED_PIPE|RED_WRITE)) == (RED_PIPE|RED_WRITE))
- status = pclose(rp->fp);
- else if (rp->fp)
- status = fclose(rp->fp);
- else if (rp->iop) {
- if (rp->flag & RED_PIPE)
- status = gawk_pclose(rp);
- else {
- status = iop_close(rp->iop);
- rp->iop = NULL;
- }
- }
-
- what = (rp->flag & RED_PIPE) ? "pipe" : "file";
-
- if (exitwarn)
- warning("no explicit close of %s \"%s\" provided",
- what, rp->value);
-
- /* SVR4 awk checks and warns about status of close */
- if (status) {
- char *s = strerror(errno);
-
- warning("failure status (%d) on %s close of \"%s\" (%s)",
- status, what, rp->value, s);
-
- if (! do_unix) {
- /* set ERRNO too so that program can get at it */
- unref(ERRNO_node->var_value);
- ERRNO_node->var_value = make_string(s, strlen(s));
- }
- }
- if (rp->next)
- rp->next->prev = rp->prev;
- if (rp->prev)
- rp->prev->next = rp->next;
- else
- red_head = rp->next;
- free(rp->value);
- free((char *)rp);
- return status;
- }
-
- int
- flush_io ()
- {
- register struct redirect *rp;
- int status = 0;
-
- errno = 0;
- if (fflush(stdout)) {
- warning("error writing standard output (%s).", strerror(errno));
- status++;
- }
- if (fflush(stderr)) {
- #ifndef __amigados__ /* HACK (fnf) */
- warning("error writing standard error (%s).", strerror(errno));
- status++;
- #endif
- }
- for (rp = red_head; rp != NULL; rp = rp->next)
- /* flush both files and pipes, what the heck */
- if ((rp->flag & RED_WRITE) && rp->fp != NULL) {
- if (fflush(rp->fp)) {
- warning("%s flush of \"%s\" failed (%s).",
- (rp->flag & RED_PIPE) ? "pipe" :
- "file", rp->value, strerror(errno));
- status++;
- }
- }
- return status;
- }
-
- int
- close_io ()
- {
- register struct redirect *rp;
- register struct redirect *next;
- int status = 0;
-
- errno = 0;
- for (rp = red_head; rp != NULL; rp = next) {
- next = rp->next;
- /* close_redir() will print a message if needed */
- /* if do_lint, warn about lack of explicit close */
- if (close_redir(rp, do_lint))
- status++;
- rp = NULL;
- }
- /*
- * Some of the non-Unix os's have problems doing an fclose
- * on stdout and stderr. Since we don't really need to close
- * them, we just flush them, and do that across the board.
- */
- if (fflush(stdout)) {
- warning("error writing standard output (%s).", strerror(errno));
- status++;
- }
- if (fflush(stderr)) {
- #ifndef __amigados__ /* HACK (fnf) */
- warning("error writing standard error (%s).", strerror(errno));
- status++;
- #endif
- }
- return status;
- }
-
- /* str2mode --- convert a string mode to an integer mode */
-
- static int
- str2mode(mode)
- const char *mode;
- {
- int ret;
-
- switch(mode[0]) {
- case 'r':
- ret = O_RDONLY;
- break;
-
- case 'w':
- ret = O_WRONLY|O_CREAT|O_TRUNC;
- break;
-
- case 'a':
- ret = O_WRONLY|O_APPEND|O_CREAT;
- break;
-
- default:
- ret = 0; /* lint */
- cant_happen();
- }
- return ret;
- }
-
- /* devopen --- handle /dev/std{in,out,err}, /dev/fd/N, regular files */
-
- /*
- * This separate version is still needed for output, since file and pipe
- * output is done with stdio. iop_open() handles input with IOBUFs of
- * more "special" files. Those files are not handled here since it makes
- * no sense to use them for output.
- */
-
- int
- devopen(name, mode)
- const char *name, *mode;
- {
- int openfd = INVALID_HANDLE;
- const char *cp, *ptr;
- int flag = 0;
- struct stat buf;
- extern double strtod();
-
- flag = str2mode(mode);
-
- if (do_unix)
- goto strictopen;
-
- #ifdef VMS
- if ((openfd = vms_devopen(name, flag)) >= 0)
- return openfd;
- #endif /* VMS */
-
- if (STREQ(name, "-"))
- openfd = fileno(stdin);
- else if (STREQN(name, "/dev/", 5) && stat((char *) name, &buf) == -1) {
- cp = name + 5;
-
- if (STREQ(cp, "stdin") && (flag & O_RDONLY) == O_RDONLY)
- openfd = fileno(stdin);
- else if (STREQ(cp, "stdout") && (flag & O_WRONLY) == O_WRONLY)
- openfd = fileno(stdout);
- else if (STREQ(cp, "stderr") && (flag & O_WRONLY) == O_WRONLY)
- openfd = fileno(stderr);
- else if (STREQN(cp, "fd/", 3)) {
- cp += 3;
- openfd = (int)strtod(cp, &ptr);
- if (openfd <= INVALID_HANDLE || ptr == cp)
- openfd = INVALID_HANDLE;
- }
- }
-
- strictopen:
- if (openfd == INVALID_HANDLE)
- openfd = open(name, flag, 0666);
- if (openfd != INVALID_HANDLE && fstat(openfd, &buf) > 0)
- if (S_ISDIR(buf.st_mode))
- fatal("file `%s' is a directory", name);
- return openfd;
- }
-
-
- /* spec_setup --- setup an IOBUF for a special internal file */
-
- static void
- spec_setup(iop, len, allocate)
- IOBUF *iop;
- int len;
- int allocate;
- {
- char *cp;
-
- if (allocate) {
- emalloc(cp, char *, len+2, "spec_setup");
- iop->buf = cp;
- } else {
- len = strlen(iop->buf);
- iop->buf[len++] = '\n'; /* get_a_record clobbered it */
- iop->buf[len] = '\0'; /* just in case */
- }
- iop->off = iop->buf;
- iop->cnt = 0;
- iop->secsiz = 0;
- iop->size = len;
- iop->end = iop->buf + len;
- iop->fd = -1;
- iop->flag = IOP_IS_INTERNAL;
- }
-
- /* specfdopen --- open a fd special file */
-
- static int
- specfdopen(iop, name, mode)
- IOBUF *iop;
- const char *name, *mode;
- {
- int fd;
- IOBUF *tp;
-
- fd = devopen(name, mode);
- if (fd == INVALID_HANDLE)
- return INVALID_HANDLE;
- tp = iop_alloc(fd);
- if (tp == NULL)
- return INVALID_HANDLE;
- *iop = *tp;
- iop->flag |= IOP_NO_FREE;
- free(tp);
- return 0;
- }
-
- /*
- * Following mess will improve in 2.16; this is written to avoid
- * long lines, avoid splitting #if with backslash, and avoid #elif
- * to maximize portability.
- */
- #ifndef GETPGRP_NOARG
- #if defined(__svr4__) || defined(BSD4_4) || defined(_POSIX_SOURCE)
- #define GETPGRP_NOARG
- #else
- #if defined(i860) || defined(_AIX) || defined(hpux) || defined(VMS)
- #define GETPGRP_NOARG
- #else
- #if defined(OS2) || defined(MSDOS) || defined(AMIGA) || defined(atarist)
- #define GETPGRP_NOARG
- #endif
- #endif
- #endif
- #endif
-
- #ifdef GETPGRP_NOARG
- #define getpgrp_ARG /* nothing */
- #else
- #define getpgrp_ARG getpid()
- #endif
-
- /* pidopen --- "open" /dev/pid, /dev/ppid, and /dev/pgrpid */
-
- static int
- pidopen(iop, name, mode)
- IOBUF *iop;
- const char *name, *mode;
- {
- char tbuf[BUFSIZ];
- int i;
-
- if (name[6] == 'g')
- sprintf(tbuf, "%d\n", getpgrp( getpgrp_ARG ));
- else if (name[6] == 'i')
- sprintf(tbuf, "%d\n", getpid());
- else
- sprintf(tbuf, "%d\n", getppid());
- i = strlen(tbuf);
- spec_setup(iop, i, 1);
- strcpy(iop->buf, tbuf);
- return 0;
- }
-
- /* useropen --- "open" /dev/user */
-
- /*
- * /dev/user creates a record as follows:
- * $1 = getuid()
- * $2 = geteuid()
- * $3 = getgid()
- * $4 = getegid()
- * If multiple groups are supported, the $5 through $NF are the
- * supplementary group set.
- */
-
- static int
- useropen(iop, name, mode)
- IOBUF *iop;
- const char *name, *mode;
- {
- char tbuf[BUFSIZ], *cp;
- int i;
- #if defined(NGROUPS_MAX) && NGROUPS_MAX > 0
- #if defined(atarist) || defined(__svr4__) || defined(__osf__)
- gid_t groupset[NGROUPS_MAX];
- #else
- int groupset[NGROUPS_MAX];
- #endif
- int ngroups;
- #endif
-
- sprintf(tbuf, "%d %d %d %d", getuid(), geteuid(), getgid(), getegid());
-
- cp = tbuf + strlen(tbuf);
- #if defined(NGROUPS_MAX) && NGROUPS_MAX > 0
- ngroups = getgroups(NGROUPS_MAX, groupset);
- if (ngroups == -1)
- fatal("could not find groups: %s", strerror(errno));
-
- for (i = 0; i < ngroups; i++) {
- *cp++ = ' ';
- sprintf(cp, "%d", (int)groupset[i]);
- cp += strlen(cp);
- }
- #endif
- *cp++ = '\n';
- *cp++ = '\0';
-
-
- i = strlen(tbuf);
- spec_setup(iop, i, 1);
- strcpy(iop->buf, tbuf);
- return 0;
- }
-
- /* iop_open --- handle special and regular files for input */
-
- static IOBUF *
- iop_open(name, mode)
- const char *name, *mode;
- {
- int openfd = INVALID_HANDLE;
- int flag = 0;
- struct stat buf;
- IOBUF *iop;
- static struct internal {
- const char *name;
- int compare;
- int (*fp) P((IOBUF*,const char *,const char *));
- IOBUF iob;
- } table[] = {
- { "/dev/fd/", 8, specfdopen },
- { "/dev/stdin", 10, specfdopen },
- { "/dev/stdout", 11, specfdopen },
- { "/dev/stderr", 11, specfdopen },
- { "/dev/pid", 8, pidopen },
- { "/dev/ppid", 9, pidopen },
- { "/dev/pgrpid", 11, pidopen },
- { "/dev/user", 9, useropen },
- };
- int devcount = sizeof(table) / sizeof(table[0]);
-
- flag = str2mode(mode);
-
- if (do_unix)
- goto strictopen;
-
- if (STREQ(name, "-"))
- openfd = fileno(stdin);
- else if (STREQN(name, "/dev/", 5) && stat((char *) name, &buf) == -1) {
- int i;
-
- for (i = 0; i < devcount; i++) {
- if (STREQN(name, table[i].name, table[i].compare)) {
- iop = & table[i].iob;
-
- if (iop->buf != NULL) {
- spec_setup(iop, 0, 0);
- return iop;
- } else if ((*table[i].fp)(iop, name, mode) == 0)
- return iop;
- else {
- warning("could not open %s, mode `%s'",
- name, mode);
- return NULL;
- }
- }
- }
- }
-
- strictopen:
- if (openfd == INVALID_HANDLE)
- openfd = open(name, flag, 0666);
- if (openfd != INVALID_HANDLE && fstat(openfd, &buf) > 0)
- if ((buf.st_mode & S_IFMT) == S_IFDIR)
- fatal("file `%s' is a directory", name);
- iop = iop_alloc(openfd);
- return iop;
- }
-
- #ifndef PIPES_SIMULATED
- /* real pipes */
- static int
- wait_any(interesting)
- int interesting; /* pid of interest, if any */
- {
- RETSIGTYPE (*hstat)(), (*istat)(), (*qstat)();
- int pid;
- int status = 0;
- struct redirect *redp;
- extern int errno;
-
- hstat = signal(SIGHUP, SIG_IGN);
- istat = signal(SIGINT, SIG_IGN);
- qstat = signal(SIGQUIT, SIG_IGN);
- for (;;) {
- #ifdef NeXT
- pid = wait((union wait *)&status);
- #else
- pid = wait(&status);
- #endif /* NeXT */
- if (interesting && pid == interesting) {
- break;
- } else if (pid != -1) {
- for (redp = red_head; redp != NULL; redp = redp->next)
- if (pid == redp->pid) {
- redp->pid = -1;
- redp->status = status;
- if (redp->fp) {
- pclose(redp->fp);
- redp->fp = 0;
- }
- if (redp->iop) {
- (void) iop_close(redp->iop);
- redp->iop = 0;
- }
- break;
- }
- }
- if (pid == -1 && errno == ECHILD)
- break;
- }
- signal(SIGHUP, hstat);
- signal(SIGINT, istat);
- signal(SIGQUIT, qstat);
- return(status);
- }
-
- static IOBUF *
- gawk_popen(cmd, rp)
- char *cmd;
- struct redirect *rp;
- {
- int p[2];
- register int pid;
-
- /* used to wait for any children to synchronize input and output,
- * but this could cause gawk to hang when it is started in a pipeline
- * and thus has a child process feeding it input (shell dependant)
- */
- /*(void) wait_any(0);*/ /* wait for outstanding processes */
-
- if (pipe(p) < 0)
- fatal("cannot open pipe \"%s\" (%s)", cmd, strerror(errno));
- if ((pid = fork()) == 0) {
- if (close(1) == -1)
- fatal("close of stdout in child failed (%s)",
- strerror(errno));
- if (dup(p[1]) != 1)
- fatal("dup of pipe failed (%s)", strerror(errno));
- if (close(p[0]) == -1 || close(p[1]) == -1)
- fatal("close of pipe failed (%s)", strerror(errno));
- if (close(0) == -1)
- fatal("close of stdin in child failed (%s)",
- strerror(errno));
- execl("/bin/sh", "sh", "-c", cmd, 0);
- _exit(127);
- }
- if (pid == -1)
- fatal("cannot fork for \"%s\" (%s)", cmd, strerror(errno));
- rp->pid = pid;
- if (close(p[1]) == -1)
- fatal("close of pipe failed (%s)", strerror(errno));
- return (rp->iop = iop_alloc(p[0]));
- }
-
- static int
- gawk_pclose(rp)
- struct redirect *rp;
- {
- (void) iop_close(rp->iop);
- rp->iop = NULL;
-
- /* process previously found, return stored status */
- if (rp->pid == -1)
- return (rp->status >> 8) & 0xFF;
- rp->status = wait_any(rp->pid);
- rp->pid = -1;
- return (rp->status >> 8) & 0xFF;
- }
-
- #else /* PIPES_SIMULATED */
- /* use temporary file rather than pipe */
- /* except if popen() provides real pipes too */
-
- #if defined(VMS) || defined(OS2) || defined (MSDOS)
- static IOBUF *
- gawk_popen(cmd, rp)
- char *cmd;
- struct redirect *rp;
- {
- FILE *current;
-
- if ((current = popen(cmd, "r")) == NULL)
- return NULL;
- return (rp->iop = iop_alloc(fileno(current)));
- }
-
- static int
- gawk_pclose(rp)
- struct redirect *rp;
- {
- int rval, aval, fd = rp->iop->fd;
- FILE *kludge = fdopen(fd, (char *) "r"); /* pclose needs FILE* w/ right fileno */
-
- rp->iop->fd = dup(fd); /* kludge to allow close() + pclose() */
- rval = iop_close(rp->iop);
- rp->iop = NULL;
- aval = pclose(kludge);
- return (rval < 0 ? rval : aval);
- }
- #else /* VMS || OS2 || MSDOS */
-
- static
- struct {
- char *command;
- char *name;
- } pipes[_NFILE];
-
- static IOBUF *
- gawk_popen(cmd, rp)
- char *cmd;
- struct redirect *rp;
- {
- extern char *strdup(const char *);
- int current;
- char *name;
- static char cmdbuf[256];
-
- /* get a name to use. */
- if ((name = tempnam(".", "pip")) == NULL)
- return NULL;
- sprintf(cmdbuf,"%s > %s", cmd, name);
- system(cmdbuf);
- if ((current = open(name,O_RDONLY)) == INVALID_HANDLE)
- return NULL;
- pipes[current].name = name;
- pipes[current].command = strdup(cmd);
- rp->iop = iop_alloc(current);
- return (rp->iop = iop_alloc(current));
- }
-
- static int
- gawk_pclose(rp)
- struct redirect *rp;
- {
- int cur = rp->iop->fd;
- int rval;
-
- rval = iop_close(rp->iop);
- rp->iop = NULL;
-
- /* check for an open file */
- if (pipes[cur].name == NULL)
- return -1;
- unlink(pipes[cur].name);
- free(pipes[cur].name);
- pipes[cur].name = NULL;
- free(pipes[cur].command);
- return rval;
- }
- #endif /* VMS || OS2 || MSDOS */
-
- #endif /* PIPES_SIMULATED */
-
- NODE *
- do_getline(tree)
- NODE *tree;
- {
- struct redirect *rp = NULL;
- IOBUF *iop;
- int cnt = EOF;
- char *s = NULL;
- int errcode;
-
- while (cnt == EOF) {
- if (tree->rnode == NULL) { /* no redirection */
- iop = nextfile(0);
- if (iop == NULL) /* end of input */
- return tmp_number((AWKNUM) 0.0);
- } else {
- int redir_error = 0;
-
- rp = redirect(tree->rnode, &redir_error);
- if (rp == NULL && redir_error) { /* failed redirect */
- if (! do_unix) {
- s = strerror(redir_error);
-
- unref(ERRNO_node->var_value);
- ERRNO_node->var_value =
- make_string(s, strlen(s));
- }
- return tmp_number((AWKNUM) -1.0);
- }
- iop = rp->iop;
- if (iop == NULL) /* end of input */
- return tmp_number((AWKNUM) 0.0);
- }
- errcode = 0;
- cnt = get_a_record(&s, iop, *RS, & errcode);
- if (! do_unix && errcode != 0) {
- s = strerror(errcode);
-
- unref(ERRNO_node->var_value);
- ERRNO_node->var_value = make_string(s, strlen(s));
- return tmp_number((AWKNUM) -1.0);
- }
- if (cnt == EOF) {
- if (rp) {
- /*
- * Don't do iop_close() here if we are
- * reading from a pipe; otherwise
- * gawk_pclose will not be called.
- */
- if (!(rp->flag & RED_PIPE)) {
- (void) iop_close(iop);
- rp->iop = NULL;
- }
- rp->flag |= RED_EOF; /* sticky EOF */
- return tmp_number((AWKNUM) 0.0);
- } else
- continue; /* try another file */
- }
- if (!rp) {
- NR += 1;
- FNR += 1;
- }
- if (tree->lnode == NULL) /* no optional var. */
- set_record(s, cnt, 1);
- else { /* assignment to variable */
- Func_ptr after_assign = NULL;
- NODE **lhs;
-
- lhs = get_lhs(tree->lnode, &after_assign);
- unref(*lhs);
- *lhs = make_string(s, strlen(s));
- (*lhs)->flags |= MAYBE_NUM;
- /* we may have to regenerate $0 here! */
- if (after_assign)
- (*after_assign)();
- }
- }
- return tmp_number((AWKNUM) 1.0);
- }
-
- int
- pathopen (file)
- const char *file;
- {
- int fd = do_pathopen(file);
-
- #ifdef DEFAULT_FILETYPE
- if (! do_unix && fd <= INVALID_HANDLE) {
- char *file_awk;
- int save = errno;
- #ifdef VMS
- int vms_save = vaxc$errno;
- #endif
-
- /* append ".awk" and try again */
- emalloc(file_awk, char *, strlen(file) +
- sizeof(DEFAULT_FILETYPE) + 1, "pathopen");
- sprintf(file_awk, "%s%s", file, DEFAULT_FILETYPE);
- fd = do_pathopen(file_awk);
- free(file_awk);
- if (fd <= INVALID_HANDLE) {
- errno = save;
- #ifdef VMS
- vaxc$errno = vms_save;
- #endif
- }
- }
- #endif /*DEFAULT_FILETYPE*/
-
- return fd;
- }
-
- static int
- do_pathopen (file)
- const char *file;
- {
- static const char *savepath = DEFPATH; /* defined in config.h */
- static int first = 1;
- const char *awkpath;
- char *cp, trypath[BUFSIZ];
- int fd;
-
- if (STREQ(file, "-"))
- return (0);
-
- if (do_unix)
- return (devopen(file, "r"));
-
- if (first) {
- first = 0;
- if ((awkpath = getenv ("AWKPATH")) != NULL && *awkpath)
- savepath = awkpath; /* used for restarting */
- }
- awkpath = savepath;
-
- /* some kind of path name, no search */
- #ifdef VMS /* (strchr not equal implies either or both not NULL) */
- if (strchr(file, ':') != strchr(file, ']')
- || strchr(file, '>') != strchr(file, '/'))
- #else /*!VMS*/
- #if defined(MSDOS) || defined(OS2)
- if (strchr(file, '/') != strchr(file, '\\')
- || strchr(file, ':') != NULL)
- #else
- if (strchr(file, '/') != NULL)
- #endif /*MSDOS*/
- #endif /*VMS*/
- return (devopen(file, "r"));
-
- #if defined(MSDOS) || defined(OS2)
- _searchenv(file, "AWKPATH", trypath);
- if (trypath[0] == '\0')
- _searchenv(file, "PATH", trypath);
- return (trypath[0] == '\0') ? 0 : devopen(trypath, "r");
- #else
- do {
- trypath[0] = '\0';
- /* this should take into account limits on size of trypath */
- for (cp = trypath; *awkpath && *awkpath != ENVSEP; )
- *cp++ = *awkpath++;
-
- if (cp != trypath) { /* nun-null element in path */
- /* add directory punctuation only if needed */
- #ifdef VMS
- if (strchr(":]>/", *(cp-1)) == NULL)
- #else
- #if defined(MSDOS) || defined(OS2)
- if (strchr(":\\/", *(cp-1)) == NULL)
- #else
- if (*(cp-1) != '/')
- #endif
- #endif
- *cp++ = '/';
- /* append filename */
- strcpy (cp, file);
- } else
- strcpy (trypath, file);
- if ((fd = devopen(trypath, "r")) >= 0)
- return (fd);
-
- /* no luck, keep going */
- if(*awkpath == ENVSEP && awkpath[1] != '\0')
- awkpath++; /* skip colon */
- } while (*awkpath);
- /*
- * You might have one of the awk
- * paths defined, WITHOUT the current working directory in it.
- * Therefore try to open the file in the current directory.
- */
- return (devopen(file, "r"));
- #endif
- }
-