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cmdline.c
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cmdline.c
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/* cmdline.c - core analysis suite
*
* Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc.
* Copyright (C) 2002-2015,2019 David Anderson
* Copyright (C) 2002-2015,2019 Red Hat, Inc. All rights reserved.
*
* This program 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.
*
* This program 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.
*/
#include "defs.h"
static void restore_sanity(void);
static void restore_ifile_sanity(void);
static int pseudo_command(char *);
static void check_special_handling(char *);
static int is_executable_in_PATH(char *);
static int is_shell_script(char *);
static void list_aliases(char *);
static int allocate_alias(int);
static int alias_exists(char *);
static void resolve_aliases(void);
static int setup_redirect(int);
int multiple_pipes(char **);
static int output_command_to_pids(void);
static void set_my_tty(void);
static char *signame(int);
static int setup_stdpipe(void);
static void wait_for_children(ulong);
#define ZOMBIES_ONLY (1)
#define ALL_CHILDREN (2)
int shell_command(char *);
static void modify_orig_line(char *, struct args_input_file *);
static void modify_expression_arg(char *, char **, struct args_input_file *);
static int verify_args_input_file(char *);
static char *crash_readline_completion_generator(const char *, int);
static char **crash_readline_completer(const char *, int, int);
#define READLINE_LIBRARY
#include <readline.h>
#include <rldefs.h>
#include <history.h>
static void readline_init(void);
static struct alias_data alias_head = { 0 };
void
process_command_line(void)
{
/*
* Restore normal environment, clearing out any excess baggage
* piled up by the previous command.
*/
restore_sanity();
fp = stdout;
BZERO(pc->command_line, BUFSIZE);
if (!(pc->flags &
(READLINE|SILENT|CMDLINE_IFILE|RCHOME_IFILE|RCLOCAL_IFILE)))
fprintf(fp, "%s", pc->prompt);
fflush(fp);
/*
* Input can come from five possible sources:
*
* 1. an .rc file located in the user's HOME directory.
* 2. an .rc file located in the current directory.
* 3. an input file that was designated by the -i flag at
* program invocation.
* 4. from a terminal.
* 5. from a pipe, if stdin is a pipe rather than a terminal.
*
* But first, handle the interruption of an input file caused
* by a FATAL error in one of its commands.
*
*/
if (pc->ifile_in_progress) {
switch (pc->ifile_in_progress)
{
case RCHOME_IFILE:
pc->flags |= INIT_IFILE|RCHOME_IFILE;
sprintf(pc->command_line, "< %s/.%src",
pc->home, pc->program_name);
break;
case RCLOCAL_IFILE:
sprintf(pc->command_line, "< .%src", pc->program_name);
pc->flags |= INIT_IFILE|RCLOCAL_IFILE;
break;
case CMDLINE_IFILE:
sprintf(pc->command_line, "< %s", pc->input_file);
pc->flags |= INIT_IFILE|CMDLINE_IFILE;
break;
case RUNTIME_IFILE:
sprintf(pc->command_line, "%s", pc->runtime_ifile_cmd);
pc->flags |= IFILE_ERROR;
break;
default:
error(FATAL, "invalid input file\n");
}
} else if (pc->flags & RCHOME_IFILE) {
sprintf(pc->command_line, "< %s/.%src",
pc->home, pc->program_name);
pc->flags |= INIT_IFILE;
} else if (pc->flags & RCLOCAL_IFILE) {
sprintf(pc->command_line, "< .%src", pc->program_name);
pc->flags |= INIT_IFILE;
} else if (pc->flags & CMDLINE_IFILE) {
sprintf(pc->command_line, "< %s", pc->input_file);
pc->flags |= INIT_IFILE;
} else if (pc->flags & TTY) {
if (!(pc->readline = readline(pc->prompt))) {
args[0] = NULL;
fprintf(fp, "\n");
return;
}
if (strlen(pc->readline) >= BUFSIZE)
error(FATAL, "input line exceeds maximum of 1500 bytes\n");
else
strcpy(pc->command_line, pc->readline);
free(pc->readline);
clean_line(pc->command_line);
pseudo_command(pc->command_line);
strcpy(pc->orig_line, pc->command_line);
if (strlen(pc->command_line) && !iscntrl(pc->command_line[0]))
add_history(pc->command_line);
check_special_handling(pc->command_line);
} else {
if (fgets(pc->command_line, BUFSIZE-1, stdin) == NULL)
clean_exit(1);
clean_line(pc->command_line);
strcpy(pc->orig_line, pc->command_line);
}
/*
* First clean out all linefeeds and leading/trailing spaces.
* Then substitute aliases for the real thing they represent.
*/
clean_line(pc->command_line);
resolve_aliases();
/*
* Setup output redirection based upon the command line itself or
* based upon the default scrolling behavior, if any.
*/
switch (setup_redirect(FROM_COMMAND_LINE))
{
case REDIRECT_NOT_DONE:
case REDIRECT_TO_STDPIPE:
case REDIRECT_TO_PIPE:
case REDIRECT_TO_FILE:
break;
case REDIRECT_SHELL_ESCAPE:
case REDIRECT_SHELL_COMMAND:
case REDIRECT_FAILURE:
RESTART();
break;
}
/*
* Setup the global argcnt and args[] array for use by everybody
* during the life of this command.
*/
argcnt = parse_line(pc->command_line, args);
}
/*
* Allow input file redirection without having to put a space between
* the < and the filename. Allow the "pointer-to" asterisk to "touch"
* the structure/union name.
*/
static void
check_special_handling(char *s)
{
char local[BUFSIZE];
strcpy(local, s);
if ((local[0] == '*') && (!whitespace(local[1]))) {
sprintf(s, "* %s", &local[1]);
return;
}
if ((local[0] == '<') && (!whitespace(local[1]))) {
sprintf(s, "< %s", &local[1]);
return;
}
}
static int
is_executable_in_PATH(char *filename)
{
char *buf1, *buf2;
char *tok, *path;
int retval;
if ((path = getenv("PATH"))) {
buf1 = GETBUF(strlen(path)+1);
buf2 = GETBUF(strlen(path)+1);
strcpy(buf2, path);
} else
return FALSE;
retval = FALSE;
tok = strtok(buf2, ":");
while (tok) {
sprintf(buf1, "%s/%s", tok, filename);
if (file_exists(buf1, NULL) &&
(access(buf1, X_OK) == 0)) {
retval = TRUE;
break;
}
tok = strtok(NULL, ":");
}
FREEBUF(buf1);
FREEBUF(buf2);
return retval;
}
/*
* At this point the only pseudo commands are the "r" (repeat) and
* the "h" (history) command:
*
* 1. an "r" alone, or "!!" along, just means repeat the last command.
* 2. an "r" followed by a number, means repeat that command from the
* history table.
* 3. an "!" followed by a number that is not the name of a command
* in the user's PATH, means repeat that command from the history table.
* 4. an "r" followed by one or more non-decimal characters means to
* seek back until a line-beginning match is found.
* 5. an "h" alone, or a string beginning with "hi", means history.
*/
static int
pseudo_command(char *input)
{
int i;
HIST_ENTRY *entry;
int idx, found;
char *p;
clean_line(input);
/*
* Just dump all commands that have been entered to date.
*/
if (STREQ(input, "h") || STRNEQ(input, "hi")) {
dump_history();
pc->command_line[0] = NULLCHAR;
return TRUE;
}
if (STREQ(input, "r") || STREQ(input, "!!")) {
if (!history_offset)
error(FATAL, "no commands entered!\n");
entry = history_get(history_offset);
strcpy(input, entry->line);
fprintf(fp, "%s%s\n", pc->prompt, input);
return TRUE;
}
if ((input[0] == 'r') && decimal(&input[1], 0)) {
if (!history_offset)
error(FATAL, "no commands entered!\n");
p = &input[1];
goto rerun;
}
if ((input[0] == '!') && decimal(&input[1], 0) &&
!is_executable_in_PATH(first_nonspace(&input[1]))) {
p = first_nonspace(&input[1]);
goto rerun;
}
if (STRNEQ(input, "r ")) {
if (!history_offset)
error(FATAL, "no commands entered!\n");
p = first_nonspace(&input[1]);
rerun:
if (decimal(p, 0)) {
idx = atoi(p);
if (idx == 0)
goto invalid_repeat_request;
if (idx > history_offset)
error(FATAL, "command %d not entered yet!\n",
idx);
entry = history_get(idx);
strcpy(input, entry->line);
fprintf(fp, "%s%s\n", pc->prompt, input);
return TRUE;
}
idx = -1;
found = FALSE;
for (i = history_offset; i > 0; i--) {
entry = history_get(i);
if (STRNEQ(entry->line, p)) {
found = TRUE;
break;
}
}
if (found) {
strcpy(input, entry->line);
fprintf(fp, "%s%s\n", pc->prompt, input);
return TRUE;
}
invalid_repeat_request:
fprintf(fp, "invalid repeat request: %s\n", input);
strcpy(input, "");
return TRUE;
}
return FALSE;
}
/*
* Dump the history table in first-to-last chronological order.
*/
void
dump_history(void)
{
int i;
HIST_ENTRY **the_history;
HIST_ENTRY *entry;
if (!history_offset)
error(FATAL, "no commands entered!\n");
the_history = history_list();
for (i = 0; i < history_offset; i++) {
entry = the_history[i];
fprintf(fp, "[%d] %s\n", i+1, entry->line);
}
}
/*
* Pager arguments.
*/
static char *less_argv[5] = {
"/usr/bin/less",
"-E",
"-X",
"-Ps -- MORE -- forward\\: <SPACE>, <ENTER> or j backward\\: b or k quit\\: q",
NULL
};
static char *more_argv[2] = {
"/bin/more",
NULL
};
static char **CRASHPAGER_argv = NULL;
int
CRASHPAGER_valid(void)
{
int i, c;
char *env, *CRASHPAGER_buf;
char *arglist[MAXARGS];
if (CRASHPAGER_argv)
return TRUE;
if (!(env = getenv("CRASHPAGER")))
return FALSE;
if (strstr(env, "|") || strstr(env, "<") || strstr(env, ">")) {
error(INFO,
"CRASHPAGER ignored: contains invalid character: \"%s\"\n",
env);
return FALSE;
}
if ((CRASHPAGER_buf = (char *)malloc(strlen(env)+1)) == NULL)
return FALSE;
strcpy(CRASHPAGER_buf, env);
if (!(c = parse_line(CRASHPAGER_buf, arglist)) ||
!file_exists(arglist[0], NULL) || access(arglist[0], X_OK) ||
!(CRASHPAGER_argv = (char **)malloc(sizeof(char *) * (c+1)))) {
free(CRASHPAGER_buf);
if (strlen(env))
error(INFO,
"CRASHPAGER ignored: \"%s\"\n", env);
return FALSE;
}
for (i = 0; i < c; i++)
CRASHPAGER_argv[i] = arglist[i];
CRASHPAGER_argv[i] = NULL;
return TRUE;
}
/*
* Set up a command string buffer for error/help output.
*/
char *
setup_scroll_command(void)
{
char *buf;
long i, len;
if (!(pc->flags & SCROLL))
return NULL;
switch (pc->scroll_command)
{
case SCROLL_LESS:
buf = GETBUF(strlen(less_argv[0])+1);
strcpy(buf, less_argv[0]);
break;
case SCROLL_MORE:
buf = GETBUF(strlen(more_argv[0])+1);
strcpy(buf, more_argv[0]);
break;
case SCROLL_CRASHPAGER:
for (i = len = 0; CRASHPAGER_argv[i]; i++)
len += strlen(CRASHPAGER_argv[i])+1;
buf = GETBUF(len);
for (i = 0; CRASHPAGER_argv[i]; i++) {
sprintf(&buf[strlen(buf)], "%s%s",
i ? " " : "",
CRASHPAGER_argv[i]);
}
break;
default:
return NULL;
}
return buf;
}
/*
* Parse the command line for pipe or redirect characters:
*
* 1. if a "|" character is found, popen() what comes after it, and
* modify the contents of the global "fp" FILE pointer.
* 2. if one or two ">" characters are found, fopen() the filename that
* follows, and modify the contents of the global "fp" FILE pointer.
*
* Care is taken to segregate:
*
* 1. expressions encompassed by parentheses, or
* 2. strings encompassed by single or double quotation marks
*
* When either of the above are in affect, no redirection is done.
*
* Lastly, if no redirection is requested by the user on the command line,
* output is passed to the default scrolling command, which is popen()'d
* and again, the contents of the global "fp" FILE pointer is modified.
* This default behavior is not performed if the command is coming from
* an input file, nor if scrolling has been turned off.
*/
static int
setup_redirect(int origin)
{
char *p, which;
int append;
int expression;
int string;
int ret ATTRIBUTE_UNUSED;
FILE *pipe;
FILE *ofile;
pc->redirect = origin;
pc->eoc_index = 0;
p = pc->command_line;
if (STREQ(p, "|") || STREQ(p, "!")) {
ret = system("/bin/sh");
pc->redirect |= REDIRECT_SHELL_ESCAPE;
return REDIRECT_SHELL_ESCAPE;
}
if (FIRSTCHAR(p) == '|' || FIRSTCHAR(p) == '!')
pc->redirect |= REDIRECT_SHELL_COMMAND;
expression = 0;
string = FALSE;
while (*p) {
if (*p == '(')
expression++;
if (*p == ')')
expression--;
if ((*p == '"') || (*p == '\''))
string = !string;
if (!(expression || string) &&
((*p == '|') || (*p == '!'))) {
which = *p;
*p = NULLCHAR;
pc->eoc_index = p - pc->command_line;
p++;
p = strip_beginning_whitespace(p);
if (!strlen(p)) {
error(INFO, "no shell command after '%c'\n",
which);
pc->redirect |= REDIRECT_FAILURE;
return REDIRECT_FAILURE;
}
if (LASTCHAR(p) == '|')
error(FATAL_RESTART, "pipe to nowhere?\n");
if (pc->redirect & REDIRECT_SHELL_COMMAND)
return shell_command(p);
if ((pipe = popen(p, "w")) == NULL) {
error(INFO, "cannot open pipe\n");
pc->redirect |= REDIRECT_FAILURE;
return REDIRECT_FAILURE;
}
setbuf(pipe, NULL);
switch (origin)
{
case FROM_COMMAND_LINE:
fp = pc->pipe = pipe;
break;
case FROM_INPUT_FILE:
fp = pc->ifile_pipe = pipe;
break;
}
if (multiple_pipes(&p))
pc->redirect |= REDIRECT_MULTI_PIPE;
strcpy(pc->pipe_command, p);
null_first_space(pc->pipe_command);
pc->redirect |= REDIRECT_TO_PIPE;
if (!(pc->redirect & REDIRECT_SHELL_COMMAND)) {
if ((pc->pipe_pid = output_command_to_pids()))
pc->redirect |= REDIRECT_PID_KNOWN;
else
error(FATAL_RESTART,
"pipe operation failed\n");
}
return REDIRECT_TO_PIPE;
}
if (!(expression || string) && (*p == '>') &&
!((p > pc->command_line) && (*(p-1) == '-'))) {
append = FALSE;
*p = NULLCHAR;
pc->eoc_index = p - pc->command_line;
if (*(p+1) == '>') {
append = TRUE;
*p = NULLCHAR;
p++;
}
p++;
p = strip_beginning_whitespace(p);
if (!strlen(p)) {
error(INFO, "no file name after %s\n",
append ? ">>" : ">");
pc->redirect |= REDIRECT_FAILURE;
return REDIRECT_FAILURE;
}
if (pc->flags & IFILE_ERROR)
append = TRUE;
if ((ofile =
fopen(p, append ? "a+" : "w+")) == NULL) {
error(INFO, "unable to open %s\n", p);
pc->redirect = REDIRECT_FAILURE;
return REDIRECT_FAILURE;
}
setbuf(ofile, NULL);
switch (origin)
{
case FROM_COMMAND_LINE:
fp = pc->ofile = ofile;
break;
case FROM_INPUT_FILE:
fp = pc->ifile_ofile = ofile;
break;
}
pc->redirect |= REDIRECT_TO_FILE;
return REDIRECT_TO_FILE;
}
p++;
}
if ((origin == FROM_COMMAND_LINE) && (pc->flags & TTY) &&
(pc->flags & SCROLL) && pc->scroll_command) {
if (!strlen(pc->command_line) ||
STREQ(pc->command_line, "q") ||
STREQ(pc->command_line, "Q") ||
STREQ(pc->command_line, "exit") ||
STRNEQ(pc->command_line, "<")) {
pc->redirect |= REDIRECT_NOT_DONE;
return REDIRECT_NOT_DONE;
}
if (!setup_stdpipe()) {
error(INFO, "cannot open pipe\n");
pc->redirect |= REDIRECT_FAILURE;
return REDIRECT_FAILURE;
}
fp = pc->stdpipe;
pc->redirect |= REDIRECT_TO_STDPIPE;
switch (pc->scroll_command)
{
case SCROLL_LESS:
strcpy(pc->pipe_command, less_argv[0]);
break;
case SCROLL_MORE:
strcpy(pc->pipe_command, more_argv[0]);
break;
case SCROLL_CRASHPAGER:
strcpy(pc->pipe_command, CRASHPAGER_argv[0]);
break;
}
return REDIRECT_TO_STDPIPE;
}
pc->redirect |= REDIRECT_NOT_DONE;
return REDIRECT_NOT_DONE;
}
/*
* Find the last command in an input line that possibly contains
* multiple pipes.
*/
int
multiple_pipes(char **input)
{
char *p, *found;
int quote;
found = NULL;
quote = FALSE;
for (p = *input; *p; p++) {
if ((*p == '\'') || (*p == '"')) {
quote = !quote;
continue;
} else if (quote)
continue;
if (*p == '|') {
if (STRNEQ(p, "||"))
break;
found = first_nonspace(p+1);
}
}
if (found) {
*input = found;
return TRUE;
} else
return FALSE;
}
void
debug_redirect(char *s)
{
int others;
int alive;
others = 0;
console("%s: (", s);
if (pc->redirect & FROM_COMMAND_LINE)
console("%sFROM_COMMAND_LINE", others++ ? "|" : "");
if (pc->redirect & FROM_INPUT_FILE)
console("%sFROM_INPUT_FILE", others++ ? "|" : "");
if (pc->redirect & REDIRECT_NOT_DONE)
console("%sREDIRECT_NOT_DONE", others++ ? "|" : "");
if (pc->redirect & REDIRECT_TO_PIPE)
console("%sREDIRECT_TO_PIPE", others++ ? "|" : "");
if (pc->redirect & REDIRECT_TO_STDPIPE)
console("%sREDIRECT_TO_STDPIPE", others++ ? "|" : "");
if (pc->redirect & REDIRECT_TO_FILE)
console("%sREDIRECT_TO_FILE", others++ ? "|" : "");
if (pc->redirect & REDIRECT_FAILURE)
console("%sREDIRECT_FAILURE", others++ ? "|" : "");
if (pc->redirect & REDIRECT_SHELL_ESCAPE)
console("%sREDIRECT_SHELL_ESCAPE", others++ ? "|" : "");
if (pc->redirect & REDIRECT_SHELL_COMMAND)
console("%sREDIRECT_SHELL_COMMAND", others++ ? "|" : "");
if (pc->redirect & REDIRECT_PID_KNOWN)
console("%sREDIRECT_PID_KNOWN", others++ ? "|" : "");
if (pc->redirect & REDIRECT_MULTI_PIPE)
console("%sREDIRECT_MULTI_PIPE", others++ ? "|" : "");
console(")\n");
if (pc->pipe_pid || strlen(pc->pipe_command)) {
if (pc->pipe_pid && PID_ALIVE(pc->pipe_pid))
alive = TRUE;
else
alive = FALSE;
console("pipe_pid: %d (%s) pipe_command: %s\n",
pc->pipe_pid,
alive ? "alive" : "dead",
pc->pipe_command);
}
}
/*
* Determine whether the pid receiving the current piped output is still
* alive.
*
* NOTE: This routine returns TRUE by default, and only returns FALSE if
* the pipe_pid exists *and* it's known to have died. Therefore the
* caller must be cognizant of pc->pipe_pid or pc->stdpipe_pid.
*/
int
output_open(void)
{
int waitstatus, waitret;
if (!(pc->flags & TTY))
return TRUE;
switch (pc->redirect & PIPE_OPTIONS)
{
case (REDIRECT_TO_STDPIPE|FROM_COMMAND_LINE):
waitret = waitpid(pc->stdpipe_pid, &waitstatus, WNOHANG);
if ((waitret == pc->stdpipe_pid) || (waitret == -1))
return FALSE;
break;
case (REDIRECT_TO_PIPE|FROM_INPUT_FILE):
if (pc->curcmd_flags & REPEAT)
break;
/* FALLTHROUGH */
case (REDIRECT_TO_PIPE|FROM_COMMAND_LINE):
switch (pc->redirect & (REDIRECT_MULTI_PIPE))
{
case REDIRECT_MULTI_PIPE:
if (!PID_ALIVE(pc->pipe_pid))
return FALSE;
break;
default:
waitret = waitpid(pc->pipe_pid, &waitstatus, WNOHANG);
if (waitret == pc->pipe_pid)
return FALSE;
if (waitret == -1) { /* intervening sh */
if (!PID_ALIVE(pc->pipe_pid))
return FALSE;
}
break;
}
break;
default:
break;
}
return TRUE;
}
/*
* Determine the pids of the current popen'd shell and output command.
* This is all done using /proc; the ps kludge at the bottom of this
* routine is legacy, and should only get executed if /proc doesn't exist.
*/
static int
output_command_to_pids(void)
{
DIR *dirp;
struct dirent *dp;
FILE *stp;
char buf1[BUFSIZE];
char buf2[BUFSIZE];
char lookfor[BUFSIZE+2];
char *pid, *name, *status, *p_pid, *pgrp, *comm;
char *arglist[MAXARGS];
int argc;
FILE *pipe;
int retries, shell_has_exited;
retries = 0;
shell_has_exited = FALSE;
pc->pipe_pid = pc->pipe_shell_pid = 0;
comm = strrchr(pc->pipe_command, '/');
sprintf(lookfor, "(%s)", comm ? ++comm : pc->pipe_command);
stall(1000);
retry:
if (is_directory("/proc") && (dirp = opendir("/proc"))) {
for (dp = readdir(dirp); dp && !pc->pipe_pid;
dp = readdir(dirp)) {
if (!decimal(dp->d_name, 0))
continue;
sprintf(buf1, "/proc/%s/stat", dp->d_name);
if (file_exists(buf1, NULL) &&
(stp = fopen(buf1, "r"))) {
if (fgets(buf2, BUFSIZE, stp)) {
pid = strtok(buf2, " ");
name = strtok(NULL, " ");
status = strtok(NULL, " ");
p_pid = strtok(NULL, " ");
pgrp = strtok(NULL, " ");
if (STREQ(name, "(sh)") &&
(atoi(p_pid) == getpid())) {
pc->pipe_shell_pid = atoi(pid);
if (STREQ(status, "Z"))
shell_has_exited = TRUE;
}
if (STREQ(name, lookfor) &&
((atoi(p_pid) == getpid()) ||
(atoi(p_pid) == pc->pipe_shell_pid)
|| (atoi(pgrp) == getpid()))) {
pc->pipe_pid = atoi(pid);
console(
"FOUND[%d] (%d->%d->%d) %s %s p_pid: %s pgrp: %s\n",
retries, getpid(),
pc->pipe_shell_pid,
pc->pipe_pid,
name, status, p_pid, pgrp);
}
}
fclose(stp);
}
}
closedir(dirp);
}
if (!pc->pipe_pid && !shell_has_exited &&
((retries++ < 10) || pc->pipe_shell_pid)) {
stall(1000);
goto retry;
}
console("getpid: %d pipe_shell_pid: %d pipe_pid: %d\n",
getpid(), pc->pipe_shell_pid, pc->pipe_pid);
if (pc->pipe_pid)
return pc->pipe_pid;
sprintf(buf1, "ps -ft %s", pc->my_tty);
console("%s: ", buf1);
if ((pipe = popen(buf1, "r")) == NULL) {
error(INFO, "cannot determine output pid\n");
return 0;
}
while (fgets(buf1, BUFSIZE, pipe)) {
argc = parse_line(buf1, arglist);
if ((argc >= 8) &&
STREQ(arglist[7], pc->pipe_command) &&
STRNEQ(pc->my_tty, arglist[5])) {
pc->pipe_pid = atoi(arglist[1]);
break;
}
}
pclose(pipe);
console("%d\n", pc->pipe_pid);
return pc->pipe_pid;
}
/*
* Close straggling, piped-to, output commands.
*/
void
close_output(void)
{
if ((pc->flags & TTY) &&
(pc->pipe_pid || strlen(pc->pipe_command)) &&
output_open())
kill(pc->pipe_pid, 9);
}
/*
* Initialize what's needed for the command line:
*
* 1. termios structures for raw and cooked terminal mode.
* 2. set up SIGINT and SIGPIPE handlers for aborted commands.
* 3. set up the command history table.
* 4. create the prompt string.
*/
void
cmdline_init(void)
{
int fd = 0;
/*
* Stash a copy of the original termios setup.
* Build a raw version for quick use for each command entry.
*/
if (isatty(fileno(stdin)) && ((fd = open("/dev/tty", O_RDONLY)) >= 0)) {
if (tcgetattr(fd, &pc->termios_orig) == -1)
error(FATAL, "tcgetattr /dev/tty: %s\n",
strerror(errno));
if (tcgetattr(fd, &pc->termios_raw) == -1)
error(FATAL, "tcgetattr /dev/tty: %s\n",
strerror(errno));
close(fd);
pc->termios_raw.c_lflag &= ~ECHO & ~ICANON;
pc->termios_raw.c_cc[VMIN] = (char)1;
pc->termios_raw.c_cc[VTIME] = (char)0;
restore_sanity();
pc->flags |= TTY;
set_my_tty();
SIGACTION(SIGINT, restart, &pc->sigaction, NULL);
readline_init();
}
else {
if (fd < 0)
error(INFO, "/dev/tty: %s\n", strerror(errno));
if (!(pc->flags & SILENT))
fprintf(fp, "NOTE: stdin: not a tty\n\n");
fflush(fp);
pc->flags &= ~TTY;
}
SIGACTION(SIGPIPE, SIG_IGN, &pc->sigaction, NULL);
set_command_prompt(NULL);
}
/*
* Create and stash the original prompt, but allow changes during runtime.
*/
void
set_command_prompt(char *new_prompt)
{
static char *orig_prompt = NULL;
if (!orig_prompt) {
if (!(orig_prompt = (char *)malloc(strlen(pc->program_name)+3)))
error(FATAL, "cannot malloc prompt string\n");
sprintf(orig_prompt, "%s> ", pc->program_name);
}
if (new_prompt)
pc->prompt = new_prompt;
else
pc->prompt = orig_prompt;
}
/*
* SIGINT, SIGPIPE, and SIGSEGV handler.
* Signal number 0 is sent for a generic restart.
*/
#define MAX_RECURSIVE_SIGNALS (10)
#define MAX_SIGINTS_ACCEPTED (1)
void
restart(int sig)
{
static int in_restart = 0;
console("restart (%s) %s\n", signame(sig),
pc->flags & IN_GDB ? "(in gdb)" : "(in crash)");