/
proc.c
1150 lines (983 loc) · 27 KB
/
proc.c
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/**************************************************************************
* This program is Copyright (C) 1986-2002 by Jonathan Payne. JOVE is *
* provided by Jonathan and Jovehacks without charge and without *
* warranty. You may copy, modify, and/or distribute JOVE, provided that *
* this notice is included in all the source files and documentation. *
**************************************************************************/
#include "jove.h"
#include "jctype.h"
#include "fp.h"
#include "re.h"
#include "disp.h"
#include "sysprocs.h"
#include "ask.h"
#include "delete.h"
#include "extend.h"
#include "fmt.h"
#include "insert.h"
#ifdef IPROCS
# include "iproc.h"
#endif
#include "marks.h"
#include "misc.h"
#include "move.h"
#include "proc.h"
#include "wind.h"
#include <signal.h>
#include <sys/stat.h> /* for S_IWRITE and S_IREAD */
#ifdef POSIX_SIGS
# define SIGINTMASK_DECL sigset_t sigintmask;
# define SIGINTMASK_INIT() { sigemptyset(&sigintmask); sigaddset(&sigintmask, SIGINT); }
# define SIGINT_BLOCK() sigprocmask(SIG_BLOCK, &sigintmask, (sigset_t *)NULL)
# define SIGINT_UNBLOCK() sigprocmask(SIG_UNBLOCK, &sigintmask, (sigset_t *)NULL)
#else /* !POSIX_SIGS */
# ifdef USE_SIGSET
# define SIGINT_BLOCK() sighold(SIGINT)
# define SIGINT_UNBLOCK() sigrelse(SIGINT)
# else /* !USE_SIGSET */
# ifdef BSD_SIGS
# define SIGINT_BLOCK() sigsetmask(sigmask(SIGINT))
# define SIGINT_UNBLOCK() sigsetmask(0)
# endif /* BSD_SIGS */
# endif /* !USE_SIGSET */
#endif /* !POSIX_SIGS */
/* This disgusting RE search string parses output from the GREP
* family, from the pdp11 compiler, pcc, and lint. Jay (HACK)
* Fenlasen changed this to work for the lint errors.
*/
char ErrFmtStr[256] = "^\\{\"\\|\\}\\([^:\"( \t]*\\)\\{\"\\, line \\|:\\|(\\} *\\([0-9][0-9]*\\)[:)]\
\\|:: *\\([^(]*\\)(\\([0-9]*\\))$\
\\|( \\([^(]*\\)(\\([0-9]*\\)) ),"; /* VAR: format string for parse errors */
#ifdef SPELL
char SpellCmdFmt[FILESIZE] = SPELL; /* VAR: command to use for spell check */
#endif
struct error {
Buffer *er_buf; /* Buffer error is in */
LinePtr er_mess, /* Actual error message */
er_text; /* Actual error */
INTPTR_T er_char; /* char pos of error */
struct error *er_prev, /* List of errors */
*er_next;
};
private struct error *cur_error = NULL,
*errorlist = NULL;
/* Eliminate any error records that contain dangling references to Lines.
* We only eliminate error structs when either referent is recycled.
* If it deleted, we keep it (dormant) in case it will be pasted back
* into the same buffer.
*/
void
ChkErrorLines(void)
{
struct error *e;
struct error *prev = NULL;
for (e = errorlist; e != NULL;) {
struct error *next = e->er_next;
if (e->er_mess->l_dline == NULL_DADDR
|| e->er_text->l_dline == NULL_DADDR) {
/* dangling reference: delete */
if (prev == NULL) {
errorlist = next;
} else {
prev->er_next = next;
}
if (next != NULL) {
next->er_prev = prev;
}
if (cur_error == e) {
cur_error = next;
}
free((UnivPtr)e);
} else {
prev = e;
}
e = next;
}
}
/* Add an error to the end of the list of errors. This is used for
* parse-{C,LINT}-errors and for the spell-buffer command
*/
private struct error *
AddError(struct error *laste, LinePtr errline, Buffer *buf, LinePtr line, INTPTR_T charpos)
{
struct error *new = (struct error *) emalloc(sizeof * new);
new->er_prev = laste;
if (laste == NULL) {
/* first time: free up old errors */
if (errorlist != NULL) {
ErrFree();
}
cur_error = errorlist = new;
} else {
laste->er_next = new;
}
new->er_next = NULL;
new->er_buf = buf;
new->er_text = line;
new->er_char = charpos;
new->er_mess = errline;
return new;
}
void
get_FL_info(char *fname, char *lineno)
{
putmatch(1, fname, (size_t)FILESIZE);
putmatch(2, lineno, (size_t)FILESIZE);
/* if error had lineno before fname, switch the two */
if (!jisdigit(lineno[0]) && jisdigit(fname[0])) {
putmatch(1, lineno, (size_t)FILESIZE);
putmatch(2, fname, (size_t)FILESIZE);
}
}
/* Free up all the errors */
void
ErrFree(void)
{
cur_error = NULL;
while (errorlist != NULL) {
struct error *nel = errorlist->er_next;
free((UnivPtr) errorlist);
errorlist = nel;
}
}
/* Parse errors of the form specified in ErrFmtStr in the current
* buffer. Do a show error of the first error. This is neat because this
* will work for any kind of output that prints a file name and a line
* number on the same line.
*/
void
ErrParse(void)
{
struct RE_block re_blk;
Bufpos *bp;
char fname[FILESIZE],
lineno[FILESIZE];
long lnum,
last_lnum = -1;
struct error *ep = NULL;
Buffer *buf,
*lastb = NULL;
LinePtr err_line = NULL; /* avoid uninitialized complaint from gcc -W */
ErrFree(); /* This is important! */
ToFirst();
perr_buf = curbuf;
REcompile(ErrFmtStr, YES, &re_blk);
/* Find a line with a number on it. */
while ((bp = docompiled(FORWARD, &re_blk)) != NULL) {
SetDot(bp);
get_FL_info(fname, lineno);
buf = do_find((Window *)NULL, fname, YES, YES);
(void) chr_to_long(lineno, 10, NO, &lnum);
if (buf != lastb) {
lastb = buf;
last_lnum = 1; /* new file */
err_line = buf->b_first;
} else if (lnum == last_lnum) { /* one error per line is nicer */
continue;
}
err_line = next_line(err_line, lnum - last_lnum);
ep = AddError(ep, curline, buf, err_line, 0);
last_lnum = lnum;
}
if (cur_error != NULL) {
ShowErr();
}
}
private void
NeedErrors(void)
{
if (cur_error == NULL) {
complain("No errors!");
/* NOTREACHED */
}
}
private bool
ErrorHasReferents(void)
{
return inlist(cur_error->er_buf->b_first, cur_error->er_text)
&& inlist(perr_buf->b_first, cur_error->er_mess);
}
/* Go the the next error, if there is one. Put the error buffer in
* one window and the buffer with the error in another window.
* It checks to make sure that the error actually exists.
*/
private void
ToError(bool forward)
{
struct error *e = cur_error;
int num = arg_value_as_int();
NeedErrors();
if ((forward ? e->er_next : e->er_prev) == NULL) {
s_mess("You're at the %s error.", forward ? "last" : "first");
} else {
while (--num >= 0 || !ErrorHasReferents()) {
e = forward ? e->er_next : e->er_prev;
if (e == NULL) {
break;
}
cur_error = e;
}
ShowErr();
}
}
void
NextError(void)
{
ToError(YES);
}
void
PrevError(void)
{
ToError(NO);
}
int EWSize = 20; /* VAR: percentage of screen to make the error window */
private void
set_wsize(int wsize)
{
wsize = (LI * wsize) / 100;
if (wsize >= 1 && !one_windp()) {
WindSize(curwind, wsize - (curwind->w_height - 1));
}
}
/* Show the current error, i.e. put the line containing the error message
* in one window, and the buffer containing the actual error in another
* window.
*/
void
ShowErr(void)
{
Window *err_wind,
*buf_wind;
NeedErrors();
if (!ErrorHasReferents()) {
rbell();
return;
}
err_wind = windbp(perr_buf);
buf_wind = windbp(cur_error->er_buf);
if (err_wind == NULL) {
if (buf_wind != NULL) {
SetWind(buf_wind);
pop_wind(perr_buf->b_name, NO, -1);
err_wind = curwind;
} else {
pop_wind(perr_buf->b_name, NO, -1);
err_wind = curwind;
pop_wind(cur_error->er_buf->b_name, NO, -1);
buf_wind = curwind;
}
} else if (buf_wind == NULL) {
SetWind(err_wind);
pop_wind(cur_error->er_buf->b_name, NO, -1);
buf_wind = curwind;
}
/* Put the current error message at the top of its Window */
SetWind(err_wind);
SetLine(cur_error->er_mess);
SetTop(curwind, (curwind->w_line = cur_error->er_mess));
set_wsize(EWSize);
/* now go to the the line with the error in the other window */
SetWind(buf_wind);
DotTo(cur_error->er_text, cur_error->er_char);
}
char ShcomBuf[LBSIZE];
/* Make a buffer name given the command `command', i.e. "fgrep -n foo *.c"
* will return the buffer name "fgrep".
*/
char *
MakeName(char *command)
{
static char bnm[FILESIZE];
char *cp = bnm,
c;
const char *bp;
do {
c = *command++;
} while (jiswhite(c));
*cp++ = '['; /* avoid potential clash with script or program names */
while (cp < &bnm[sizeof(bnm) - 1] && c != '\0' && !jiswhite(c)) {
*cp++ = c;
c = *command++;
}
*cp = '\0';
if ((bp = jbasename(&bnm[1])) != &bnm[1]) {
/* bp overlaps bnm, cannot use strcpy */
cp = &bnm[1];
do {} while ((*cp++ = *bp++) != '\0');
cp--; /* make sure cp points at '\0' */
}
if (cp > &bnm[1] && cp < &bnm[sizeof(bnm) - 1]) {
*cp++ = ']';
*cp = '\0';
}
return bnm;
}
#ifdef SUBSHELL /* the body is the rest of this file */
/* Run make, first writing all the modified buffers (if the WtOnMk flag is
* on), parse the errors, and go the first error.
*/
bool WtOnMk = YES; /* VAR: write files on compile-it command */
bool WrapProcessLines = NO; /* VAR: wrap process lines at CO-1 chars */
private void
DoShell proto((char *, char *)),
com_finish proto((wait_status_t, char *));
private char make_cmd[LBSIZE] = "make";
void
MakeErrors(void)
{
Window *old = curwind;
if (WtOnMk) {
put_bufs(NO);
}
/* When we're not doing make or cc (i.e., the last command
* was probably a grep or something) and the user just types
* ^X ^E, he probably (possibly, hopefully, usually (in my
* case)) doesn't want to do the grep again but rather wants
* to do a make again; so we ring the bell and insert the
* default command and let the person decide.
*/
if (is_an_arg()
|| !(sindex("make", make_cmd) || sindex("cc", make_cmd))) {
if (!is_an_arg()) {
rbell();
}
/* insert the default for the user (Kludge: only if Inputp is free) */
if (Inputp == NULL) {
Inputp = make_cmd;
}
jamstr(make_cmd, ask(make_cmd, "Compilation command: "));
}
com_finish(UnixToBuf(UTB_DISP | UTB_CLOBBER | UTB_ERRWIN | UTB_SH,
MakeName(make_cmd), (char *)NULL, make_cmd), make_cmd);
ErrParse();
if (!cur_error) {
SetWind(old);
}
}
# ifdef SPELL
private void
SpelParse(const char *bname)
{
Buffer *buftospel,
*wordsb;
char wordspel[100];
Bufpos *bp;
struct error *ep = NULL;
ErrFree(); /* This is important! */
buftospel = curbuf;
wordsb = buf_exists(bname);
if (wordsb == NULL) {
complain("Buffer %s is gone!", bname);
/* NOTREACHED */
}
perr_buf = wordsb; /* This is important (buffer containing
error messages) */
SetBuf(wordsb);
ToFirst();
f_mess("Finding misspelled words ... ");
while (!lastp(curline)) {
swritef(wordspel, sizeof(wordspel), "\\<%s\\>", linebuf);
SetBuf(buftospel);
ToFirst();
while ((bp = dosearch(wordspel, FORWARD, NO)) != NULL) {
SetDot(bp);
ep = AddError(ep, wordsb->b_dot, buftospel,
curline, curchar);
}
SetBuf(wordsb);
line_move(FORWARD, 1, NO);
}
add_mess("Done.");
/* undo buffer switches that ought not to be reflected in current window */
SetBuf(curwind->w_bufp);
ShowErr();
}
void
SpelBuffer(void)
{
static const char Spell[] = "Spell";
const char *cp;
char com[100];
Buffer *savebp = curbuf;
if (curbuf->b_fname == NULL) {
complain("no file name");
/* NOTREACHED */
}
if ((cp = strchr(SpellCmdFmt, '%')) == NULL ||
cp[1] != 's' || strchr(cp + 2, '%') != NULL) {
complain("spell-command-format needs one %%s with no other format characters");
/* NOTREACHED */
}
if (IsModified(curbuf)) {
SaveFile();
}
swritef(com, sizeof(com), SpellCmdFmt, curbuf->b_fname);
(void) UnixToBuf(UTB_DISP | UTB_CLOBBER | UTB_ERRWIN | UTB_SH,
Spell, (char *)NULL, com);
message("[Delete the irrelevant words and then type ^X ^C]");
ToFirst();
Recur();
if (!valid_bp(savebp)) {
complain("Buffer gone!");
/* NOTREACHED */
}
SetBuf(savebp);
SpelParse(Spell);
}
void
SpelWords(void)
{
Buffer *wordsb = curbuf;
const char *buftospel = ask_buf((Buffer *)NULL, ALLOW_OLD | ALLOW_INDEX);
SetBuf(do_select(curwind, buftospel));
SpelParse(wordsb->b_name);
}
# endif /* SPELL */
void
ShToBuf(void)
{
char bnm[128],
cmd[LBSIZE];
jamstr(bnm, ask((char *)NULL, "Buffer: "));
jamstr(cmd, ask(ShcomBuf, "Command: "));
DoShell(bnm, cmd);
}
void
ShellCom(void)
{
jamstr(ShcomBuf, ask(ShcomBuf, ProcFmt));
DoShell(MakeName(ShcomBuf), ShcomBuf);
}
void
ShNoBuf(void)
{
jamstr(ShcomBuf, ask(ShcomBuf, ProcFmt));
com_finish(UnixToBuf(UTB_SH | UTB_FILEARG, (char *)NULL, (char *)NULL,
ShcomBuf), ShcomBuf);
}
void
Shtypeout(void)
{
wait_status_t status;
jamstr(ShcomBuf, ask(ShcomBuf, ProcFmt));
status = UnixToBuf(UTB_DISP | UTB_SH | UTB_FILEARG, (char *)NULL, (char *)NULL,
ShcomBuf);
#ifdef MSDOS_PROCS
if (status < 0) {
Typeout("[%s: not executed %d]", ShcomBuf, status);
} else if (status > 0) {
Typeout("[%s: exited with %d]", ShcomBuf, status);
} else if (!is_an_arg()) {
Typeout("[%s: completed successfully]", ShcomBuf);
}
#else /* !MSDOS_PROCS */
if (WIFSIGNALED(status)) {
Typeout("[%s: terminated by signal %d]", ShcomBuf, WTERMSIG(status));
} else if (WIFEXITED(status) && WEXITSTATUS(status) != 0) {
Typeout("[%s: exited with %d]", ShcomBuf, WEXITSTATUS(status));
} else if (!is_an_arg()) {
Typeout("[%s: completed successfully]", ShcomBuf);
}
#endif /* !MSDOS_PROCS */
TOstop();
}
/* Run the shell command into `bnm'. Empty the buffer except when we
* give a numeric argument, in which case it inserts the output at the
* current position in the buffer.
*/
private void
DoShell(char *bnm, char *command)
{
Window *savewp = curwind;
com_finish(UnixToBuf(
(is_an_arg()
? UTB_DISP | UTB_SH | UTB_FILEARG
: UTB_DISP | UTB_CLOBBER | UTB_SH | UTB_FILEARG),
bnm, (char *)NULL, command), command);
SetWind(savewp);
}
private void
com_finish(wait_status_t status, char *cmd)
{
#ifdef MSDOS_PROCS
if (status < 0) {
s_mess("[%s: not executed %d]", cmd, status);
} else if (status > 0) {
s_mess("[%s: exited with %d]", cmd, status);
} else {
s_mess("[%s: completed successfully]", cmd);
}
#else /* !MSDOS_PROCS */
if (WIFSIGNALED(status)) {
s_mess("[%s: terminated by signal %d]", cmd, WTERMSIG(status));
} else if (WIFEXITED(status) && WEXITSTATUS(status) != 0) {
s_mess("[%s: exited with %d]", cmd, WEXITSTATUS(status));
} else {
s_mess("[%s: completed successfully]", cmd);
}
#endif /* !MSDOS_PROCS */
}
#ifndef MSDOS_PROCS
/* pid of any outstanding non-iproc process.
* Note: since there is only room for one pid, there can be no more than
* one running non-iproc process.
*/
pid_t ChildPid;
void
dowait(
wait_status_t *status /* may be NULL */
)
{
# ifdef IPROCS
while (DeadPid != ChildPid) {
wait_status_t w;
pid_t rpid = wait(&w);
if (rpid == -1) {
if (errno == ECHILD) {
/* fudge what we hope is a bland value */
byte_zero((UnivPtr)&DeadStatus, sizeof(wait_status_t));
break;
}
} else {
kill_off(rpid, w);
}
}
DeadPid = 0;
if (status != NULL) {
*status = DeadStatus;
}
# else
wait_status_t w;
for (;;) {
pid_t rpid = wait(&w);
if (rpid == -1) {
if (errno == ECHILD) {
/* fudge what we hope is a bland value */
byte_zero((UnivPtr)&w, sizeof(wait_status_t));
break;
}
} else if (rpid == ChildPid) {
break;
}
}
if (status != NULL) {
*status = w;
}
# endif
ChildPid = 0;
}
#endif /* !MSDOS_PROCS */
/* Environment management for subshells */
private Env proc_env;
private char PEnvExpBuf[LBSIZE];
private char PEnvUnsetBuf[LBSIZE];
void
ProcEnvExport(void)
{
jamstr(PEnvExpBuf, ask(PEnvExpBuf, ProcFmt));
jputenv(&proc_env, PEnvExpBuf);
}
void
ProcEnvShow(void)
{
const char **p;
TOstart("subshell environment");
for (p = jenvdata(&proc_env); *p; p++) {
Typeout("%s", *p);
}
TOstop();
}
void
ProcEnvUnset(void)
{
jamstr(PEnvUnsetBuf, ask(PEnvUnsetBuf, ProcFmt));
junsetenv(&proc_env, PEnvUnsetBuf);
}
/* Run the command cmd. Output to the buffer named bnm (if not
* NULL), first erasing bnm (if UTB_DISP and UTB_CLOBBER), and
* redisplay (if UTB_DISP). Leaves bnm as the current buffer and
* leaves any windows it creates lying around. It's up to the
* caller to fix everything up after we're done. (Usually there's
* nothing to fix up.)
*
* If bnm is non-NULL, the process output goes to that buffer.
* Furthermore, if UTB_DISP, the buffer is displayed in a window.
* If not UTB_DISP, the buffer is not given a window (of course it
* might already have one). If UTB_DISP and UTB_CLOBBER, the buffer
* is emptied initially. If UTB_DISP and UTB_ERRWIN, that window's
* size is as specified by the variable error-window-size.
*
* If bnm is NULL, the process output does not go to a buffer. In this
* case, if UTB_DISP, it is displayed using Typeout; if not UTB_DISP,
* the output is discarded.
*
* Only if UTB_DISP and bnm is non-NULL are UTB_ERRWIN and
* UTB_CLOBBER meaningful.
*/
wait_status_t
UnixToBuf(
int flags, /* bunch of booleans: see UTB_* in proc.h */
const char *bnm, /* buffer name (NULL means none) */
const char *InFName, /* name of file for process stdin (NULL means none) */
const char *cmd /* command to run */
)
{
#ifndef MSDOS_PROCS
int p[2];
wait_status_t status;
SIGHANDLERTYPE old_int;
char bfn[FILESIZE]; /* buffer file name */
char bln[10]; /* buffer line number (big enough for any line number) */
char bc[6]; /* buffer column (big enough for any column) */
#else /* MSDOS_PROCS */
char cmdbuf[129];
int status;
char pipename[FILESIZE];
#endif /* MSDOS_PROCS */
bool eof;
char *argv[9]; /* worst case: /bin/sh sh -cf "echo $1" $1 $1 $2 $3 NULL */
char **ap = argv;
File *fp;
#ifdef SIGINTMASK_DECL
SIGINTMASK_DECL
SIGINTMASK_INIT();
#endif
jdbg("UnixToBuf flags 0x%x \"%s\"\n", flags, cmd);
SlowCmd += 1;;
if (flags & UTB_SH) {
*ap++ = Shell;
*ap++ = (char *)jbasename(Shell); /* lose const (but it's safe) */
*ap++ = ShFlags;
*ap++ = (char *)cmd; /* lose const (but it's safe) */
#ifdef MSDOS_PROCS
/* Kludge alert!
* UNIX-like DOS shells and command.com-like DOS shells
* seem to differ seem to differ on two points:
* - UNIX-like shells use "-" to start flags whereas
* command.com-like shells use "/".
* - UNIX-like shells seem to require that the argument to
* $SHELL -c be quoted to cause it to be taken as a single argument.
* command.com-like shells seem to automatically use the rest
* of the arguments. This is not an issue under real UNIX
* since arguments are passed already broken down.
*
* E.g., your shell comand: echo foo
* jove runs: command /c echo foo OK
* jove runs: sh -c echo foo Oops! sh just runs "echo"
* jove runs: sh -c "echo foo" Ah, now I get it.
*
* We use the first character of ShFlags to distinguish
* which kind of shell we are dealing with!
*/
if (ShFlags[0] == '-') {
swritef(cmdbuf, sizeof(cmdbuf), "\"%s\"", cmd);
ap[-1] = cmdbuf;
/* ??? can we usefully jam in a copy or two of current filename? */
}
#else /* !MSDOS_PROCS */
/* Two copies of the file name are passed to the shell:
* The Cshell uses the first as a definition of $1.
* Most versions of the Bourne shell use the second as a
* definition of $1. (Unfortunately, these same versions
* of the Bourne shell take the first as their own name
* for error reporting.)
*/
if ((flags & UTB_FILEARG) && curbuf->b_fname != NULL) {
strcpy(bfn, pr_name(curbuf->b_fname, NO));
*ap++ = bfn;
*ap++ = bfn;
{
int ln = 1; /* origin 1 */
LinePtr lp;
for (lp = curbuf->b_first; lp != curline; lp = lp->l_next) {
ln++;
}
swritef(bln, sizeof(bln), "%d", ln);
*ap++ = bln;
}
swritef(bc, sizeof(bc), "%d", curchar + 1); /* origin 1 */
*ap++ = bc;
}
#endif /* !MSDOS_PROCS */
} else {
*ap++ = (char *)cmd; /* lose const (but it's safe) */
*ap++ = (char *)jbasename(cmd); /* lose const (but it's safe) */
}
*ap++ = NULL;
if (access(argv[0], J_X_OK) != 0) {
complain("[Couldn't access %s: %s]", argv[0], strerror(errno));
/* NOTREACHED */
}
if (flags & UTB_DISP) {
if (bnm != NULL) {
if (flags & UTB_CLOBBER) {
isprocbuf(bnm);
pop_wind(bnm, YES, B_PROCESS);
} else {
pop_wind(bnm, NO, B_FILE);
}
set_wsize(flags & UTB_ERRWIN ? EWSize : 0);
message("Starting up...");
redisplay();
} else {
TOstart(argv[0]);
Typeout("Starting up...");
TOstart(argv[0]); /* overwrite "Starting up..." */
}
}
/* Now I will attempt to describe how I deal with signals during
* the execution of the shell command. My desire was to be able
* to interrupt the shell command AS SOON AS the window pops up.
* So, if we have SIGINT_BLOCK (i.e., a modern signal mechanism)
* I hold SIGINT, meaning if we interrupt now, we will eventually
* see the interrupt, but not before we are ready for it. We
* fork, the child releases the interrupt, it then sees the
* interrupt, and so exits. Meanwhile the parent ignores the
* signal, so if there was a pending one, it's now lost.
*
* Without SIGINT_BLOCK, the best behavior you can expect is that
* when you type ^] too soon after the window pops up, it may
* be ignored. The behavior BEFORE was that it would interrupt
* JOVE and then you would have to continue JOVE and wait a
* little while longer before trying again. Now that is fixed,
* in that you just have to type it twice.
*/
#ifndef MSDOS_PROCS
dopipe(p);
# ifdef SIGINT_BLOCK
SIGINT_BLOCK();
# else
old_int = setsighandler(SIGINT, SIG_IGN),
# endif
# ifdef USE_VFORK
/*
* There are several other forks in Jove, but for
* machines lacking MMUs, where vfork might be
* significantly more performant, it is nice to have
* SUBSHELL capability using pipes (MSDOS_PROCS use a
* temporary file for subshell output and spawn).
* moraes Note from 2020 4.17: vfork has not been tested in a
* long time, it is quite possible/likely that it does
* not even work (I think that nothing between here
* and the exec damages parent state, but using vfork
* is a deal with the devil)
*/
ChildPid = vfork();
# else
ChildPid = fork();
# endif
if (ChildPid == -1) {
int fork_errno = errno;
pipeclose(p);
# ifdef SIGINT_UNBLOCK
SIGINT_UNBLOCK();
# else
(void) setsighandler(SIGINT, old_int),
# endif
complain("[Fork failed: %s]", strerror(fork_errno));
/* NOTREACHED */
}
if (ChildPid == 0) {
const char *a; /* action name (for error message) */
(void) setsighandler(SIGINT, SIG_DFL);
# ifdef SIGINT_UNBLOCK
SIGINT_UNBLOCK();
# endif
if (!((a = "close 0", close(0)) == 0
&& (a = "open", open(InFName == NULL ? "/dev/null" : InFName, O_RDONLY | O_BINARY)) == 0
&& (a = "close 1", close(1)) == 0
&& (a = "dup 1", dup(p[1])) == 1
&& (a = "close 2", close(2)) == 0
&& (a = "dup 2", dup(p[1])) == 2)) {
raw_complain("% in setup for child failed: %s", a, strerror(errno));
_exit(1);
}
pipeclose(p);
jcloseall();
execve(argv[0], &argv[1], (char **) jenvdata(&proc_env));
raw_complain("Execl failed: %s", strerror(errno));
_exit(1);
}
# ifdef SIGINT_BLOCK
old_int = setsighandler(SIGINT, SIG_IGN); /* got to do this eventually */
# endif
(void) close(p[1]);
fp = fd_open(argv[1], F_READ, p[0], iobuff, LBSIZE);
#else /* MSDOS_PROCS*/
{
int oldi = dup(0),
oldo = dup(1),
olde = dup(2);
bool InFailure = NO;
int ph, pinh, saverrno = 0;
const char *op = "";
PathCat(pipename, sizeof(pipename), TmpDir, "jpXXXXXX");
ph = MakeTemp(pipename, "filter buffer");
jdbg("created temp \"%s\" ph %d\n", pipename, ph);
if (InFName == NULL) {
char nullname[FILESIZE];
PathCat(nullname, sizeof(nullname), TmpDir, "jnXXXXXX");
pinh = MakeTemp(nullname, "filter null file");
(void) unlink(nullname);
} else {
pinh = open(InFName, O_RDONLY | O_BINARY);
if (pinh < 0) {
saverrno = errno;
op = InFName;
jdbg("error opening \"%s\": %d %s\n", InFName, errno);
InFailure = YES;
}
}
if (!InFailure && (dup2(ph, 1) < 0 || dup2(ph, 2) < 0)) {
saverrno = errno;
op = "dup2 temp";
jdbg("%s file fd failed: %d %s\n", op, errno,
strerror(errno));
InFailure = YES;
}
(void) close(ph);
if (!InFailure && dup2(pinh, 0) < 0) {
saverrno = errno;
op = "dup2 input";
jdbg("%s file fd failed: %d %s\n", op, errno,
strerror(errno));
InFailure = YES;
}
(void) close(pinh);
jdbg("InFailure %d InFName \"%s\"\n", InFailure,
InFName == NULL ? "(NULL)" : InFName);
if (!InFailure) {
if (jdebug) {
int vk = 0;
while (argv[vk]) {
jdprintf("%d: \"%s\"\n", vk, argv[vk]);
vk++;
}