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picocom.c
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/* vi: set sw=4 ts=4:
*
* picocom.c
*
* simple dumb-terminal program. Helps you manually configure and test
* stuff like modems, devices w. serial ports etc.
*
* by Nick Patavalis ([email protected])
*
* 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.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <assert.h>
#include <stdarg.h>
#include <signal.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <limits.h>
#include <dirent.h>
#include <libgen.h>
#define _GNU_SOURCE
#include <getopt.h>
#include "term.h"
#include "linenoise.h"
/**********************************************************************/
#define KEY_EXIT '\x18' /* C-x: exit picocom */
#define KEY_QUIT '\x11' /* C-q: exit picocom without reseting port */
#define KEY_PULSE '\x10' /* C-p: pulse DTR */
#define KEY_TOGGLE '\x14' /* C-t: toggle DTR */
#define KEY_BAUD_UP '\x15' /* C-u: increase baudrate (up) */
#define KEY_BAUD_DN '\x04' /* C-d: decrase baudrate (down) */
#define KEY_FLOW '\x06' /* C-f: change flowcntrl mode */
#define KEY_PARITY '\x19' /* C-y: change parity mode */
#define KEY_BITS '\x02' /* C-b: change number of databits */
#define KEY_LECHO '\x03' /* C-c: toggle local echo */
#define KEY_STATUS '\x16' /* C-v: show program option */
#define KEY_SEND '\x13' /* C-s: send file */
#define KEY_RECEIVE '\x12' /* C-r: receive file */
#define KEY_BREAK '\x1c' /* C-\: break */
#define STO STDOUT_FILENO
#define STI STDIN_FILENO
/**********************************************************************/
/* implemented caracter mappings */
#define M_CRLF (1 << 0) /* map CR --> LF */
#define M_CRCRLF (1 << 1) /* map CR --> CR + LF */
#define M_IGNCR (1 << 2) /* map CR --> <nothing> */
#define M_LFCR (1 << 3) /* map LF --> CR */
#define M_LFCRLF (1 << 4) /* map LF --> CR + LF */
#define M_IGNLF (1 << 5) /* map LF --> <nothing> */
#define M_DELBS (1 << 6) /* map DEL --> BS */
#define M_BSDEL (1 << 7) /* map BS --> DEL */
#define M_NFLAGS 8
/* default character mappings */
#define M_I_DFL 0
#define M_O_DFL 0
#define M_E_DFL (M_DELBS | M_CRCRLF)
/* character mapping names */
struct map_names_s {
char *name;
int flag;
} map_names[] = {
{ "crlf", M_CRLF },
{ "crcrlf", M_CRCRLF },
{ "igncr", M_IGNCR },
{ "lfcr", M_LFCR },
{ "lfcrlf", M_LFCRLF },
{ "ignlf", M_IGNLF },
{ "delbs", M_DELBS },
{ "bsdel", M_BSDEL },
/* Sentinel */
{ NULL, 0 }
};
int
parse_map (char *s)
{
char *m, *t;
int f, flags, i;
flags = 0;
while ( (t = strtok(s, ", \t")) ) {
for (i=0; (m = map_names[i].name); i++) {
if ( ! strcmp(t, m) ) {
f = map_names[i].flag;
break;
}
}
if ( m ) flags |= f;
else { flags = -1; break; }
s = NULL;
}
return flags;
}
void
print_map (int flags)
{
int i;
for (i = 0; i < M_NFLAGS; i++)
if ( flags & (1 << i) )
printf("%s,", map_names[i].name);
printf("\n");
}
/**********************************************************************/
struct {
char port[128];
int baud;
enum flowcntrl_e flow;
char *flow_str;
enum parity_e parity;
char *parity_str;
int databits;
int lecho;
int noinit;
int noreset;
#ifdef UUCP_LOCK_DIR
int nolock;
#endif
unsigned char escape;
char send_cmd[128];
char receive_cmd[128];
int imap;
int omap;
int emap;
} opts = {
.port = "",
.baud = 9600,
.flow = FC_NONE,
.flow_str = "none",
.parity = P_NONE,
.parity_str = "none",
.databits = 8,
.lecho = 0,
.noinit = 0,
.noreset = 0,
#ifdef UUCP_LOCK_DIR
.nolock = 0,
#endif
.escape = '\x01',
.send_cmd = "sz -vv",
.receive_cmd = "rz -vv",
.imap = M_I_DFL,
.omap = M_O_DFL,
.emap = M_E_DFL
};
int tty_fd;
/**********************************************************************/
#ifdef UUCP_LOCK_DIR
/* use HDB UUCP locks .. see
* <http://www.faqs.org/faqs/uucp-internals> for details
*/
char lockname[_POSIX_PATH_MAX] = "";
int
uucp_lockname(const char *dir, const char *file)
{
char *p, *cp;
struct stat sb;
if ( ! dir || *dir == '\0' || stat(dir, &sb) != 0 )
return -1;
/* cut-off initial "/dev/" from file-name */
p = strchr(file + 1, '/');
p = p ? p + 1 : (char *)file;
/* replace '/'s with '_'s in what remains (after making a copy) */
p = cp = strdup(p);
do { if ( *p == '/' ) *p = '_'; } while(*p++);
/* build lockname */
snprintf(lockname, sizeof(lockname), "%s/LCK..%s", dir, cp);
/* destroy the copy */
free(cp);
return 0;
}
int
uucp_lock(void)
{
int r, fd, pid;
char buf[16];
mode_t m;
if ( lockname[0] == '\0' ) return 0;
fd = open(lockname, O_RDONLY);
if ( fd >= 0 ) {
r = read(fd, buf, sizeof(buf));
close(fd);
/* if r == 4, lock file is binary (old-style) */
pid = (r == 4) ? *(int *)buf : strtol(buf, NULL, 10);
if ( pid > 0
&& kill((pid_t)pid, 0) < 0
&& errno == ESRCH ) {
/* stale lock file */
printf("Removing stale lock: %s\n", lockname);
sleep(1);
unlink(lockname);
} else {
lockname[0] = '\0';
errno = EEXIST;
return -1;
}
}
/* lock it */
m = umask(022);
fd = open(lockname, O_WRONLY|O_CREAT|O_EXCL, 0666);
if ( fd < 0 ) { lockname[0] = '\0'; return -1; }
umask(m);
snprintf(buf, sizeof(buf), "%04d\n", getpid());
write(fd, buf, strlen(buf));
close(fd);
return 0;
}
int
uucp_unlock(void)
{
if ( lockname[0] ) unlink(lockname);
return 0;
}
#endif /* of UUCP_LOCK_DIR */
/**********************************************************************/
ssize_t
writen_ni(int fd, const void *buff, size_t n)
{
size_t nl;
ssize_t nw;
const char *p;
p = buff;
nl = n;
while (nl > 0) {
do {
nw = write(fd, p, nl);
} while ( nw < 0 && errno == EINTR );
if ( nw <= 0 ) break;
nl -= nw;
p += nw;
}
return n - nl;
}
int
fd_printf (int fd, const char *format, ...)
{
char buf[256];
va_list args;
int len;
va_start(args, format);
len = vsnprintf(buf, sizeof(buf), format, args);
buf[sizeof(buf) - 1] = '\0';
va_end(args);
return writen_ni(fd, buf, len);
}
void
fatal (const char *format, ...)
{
char *s, buf[256];
va_list args;
int len;
term_reset(STO);
term_reset(STI);
va_start(args, format);
len = vsnprintf(buf, sizeof(buf), format, args);
buf[sizeof(buf) - 1] = '\0';
va_end(args);
s = "\r\nFATAL: ";
writen_ni(STO, s, strlen(s));
writen_ni(STO, buf, len);
s = "\r\n";
writen_ni(STO, s, strlen(s));
/* wait a bit for output to drain */
sleep(1);
#ifdef UUCP_LOCK_DIR
uucp_unlock();
#endif
exit(EXIT_FAILURE);
}
/* maximum number of chars that can replace a single characted
due to mapping */
#define M_MAXMAP 4
int
do_map (char *b, int map, char c)
{
int n;
switch (c) {
case '\x7f':
/* DEL mapings */
if ( map & M_DELBS ) {
b[0] = '\x08'; n = 1;
} else {
b[0] = c; n = 1;
}
break;
case '\x08':
/* BS mapings */
if ( map & M_BSDEL ) {
b[0] = '\x7f'; n = 1;
} else {
b[0] = c; n = 1;
}
break;
case '\x0d':
/* CR mappings */
if ( map & M_CRLF ) {
b[0] = '\x0a'; n = 1;
} else if ( map & M_CRCRLF ) {
b[0] = '\x0d'; b[1] = '\x0a'; n = 2;
} else if ( map & M_IGNCR ) {
n = 0;
} else {
b[0] = c; n = 1;
}
break;
case '\x0a':
/* LF mappings */
if ( map & M_LFCR ) {
b[0] = '\x0d'; n = 1;
} else if ( map & M_LFCRLF ) {
b[0] = '\x0d'; b[1] = '\x0a'; n = 2;
} else if ( map & M_IGNLF ) {
n = 0;
} else {
b[0] = c; n = 1;
}
break;
default:
b[0] = c; n = 1;
break;
}
return n;
}
void
map_and_write (int fd, int map, char c)
{
char b[M_MAXMAP];
int n;
n = do_map(b, map, c);
if ( n )
if ( writen_ni(fd, b, n) < n )
fatal("write to stdout failed: %s", strerror(errno));
}
/**********************************************************************/
int
baud_up (int baud)
{
if ( baud < 300 )
baud = 300;
else if ( baud == 38400 )
baud = 57600;
else
baud = baud * 2;
#ifndef HIGH_BAUD
if ( baud > 115200 )
baud = 115200;
#else
if ( baud > 921600 )
baud = 921600;
#endif
return baud;
}
int
baud_down (int baud)
{
#ifndef HIGH_BAUD
if ( baud > 115200 )
baud = 115200;
#else
if ( baud > 921600 )
baud = 921600;
#endif
else if ( baud == 57600 )
baud = 38400;
else
baud = baud / 2;
if ( baud < 300)
baud = 300;
return baud;
}
int
flow_next (int flow, char **flow_str)
{
switch(flow) {
case FC_NONE:
flow = FC_RTSCTS;
*flow_str = "RTS/CTS";
break;
case FC_RTSCTS:
flow = FC_XONXOFF;
*flow_str = "xon/xoff";
break;
case FC_XONXOFF:
flow = FC_NONE;
*flow_str = "none";
break;
default:
flow = FC_NONE;
*flow_str = "none";
break;
}
return flow;
}
int
parity_next (int parity, char **parity_str)
{
switch(parity) {
case P_NONE:
parity = P_EVEN;
*parity_str = "even";
break;
case P_EVEN:
parity = P_ODD;
*parity_str = "odd";
break;
case P_ODD:
parity = P_NONE;
*parity_str = "none";
break;
default:
parity = P_NONE;
*parity_str = "none";
break;
}
return parity;
}
int
bits_next (int bits)
{
bits++;
if (bits > 8) bits = 5;
return bits;
}
/**********************************************************************/
void
child_empty_handler (int signum)
{
}
void
establish_child_signal_handlers (void)
{
struct sigaction empty_action;
/* Set up the structure to specify the "empty" action. */
empty_action.sa_handler = child_empty_handler;
sigemptyset (&empty_action.sa_mask);
empty_action.sa_flags = 0;
sigaction (SIGINT, &empty_action, NULL);
sigaction (SIGTERM, &empty_action, NULL);
}
int
run_cmd(int fd, ...)
{
pid_t pid;
sigset_t sigm, sigm_old;
/* block signals, let child establish its own handlers */
sigemptyset(&sigm);
sigaddset(&sigm, SIGTERM);
sigprocmask(SIG_BLOCK, &sigm, &sigm_old);
pid = fork();
if ( pid < 0 ) {
sigprocmask(SIG_SETMASK, &sigm_old, NULL);
fd_printf(STO, "*** cannot fork: %s\n", strerror(errno));
return -1;
} else if ( pid ) {
/* father: picocom */
int r;
/* reset the mask */
sigprocmask(SIG_SETMASK, &sigm_old, NULL);
/* wait for child to finish */
waitpid(pid, &r, 0);
/* reset terminal (back to raw mode) */
term_apply(STI);
/* check and report child return status */
if ( WIFEXITED(r) ) {
fd_printf(STO, "\r\n*** exit status: %d\r\n",
WEXITSTATUS(r));
return WEXITSTATUS(r);
} else {
fd_printf(STO, "\r\n*** abnormal termination: 0x%x\r\n", r);
return -1;
}
} else {
/* child: external program */
int r;
long fl;
char cmd[512];
establish_child_signal_handlers();
sigprocmask(SIG_SETMASK, &sigm_old, NULL);
/* unmanage terminal, and reset it to canonical mode */
term_remove(STI);
/* unmanage serial port fd, without reset */
term_erase(fd);
/* set serial port fd to blocking mode */
fl = fcntl(fd, F_GETFL);
fl &= ~O_NONBLOCK;
fcntl(fd, F_SETFL, fl);
/* connect stdin and stdout to serial port */
close(STI);
close(STO);
dup2(fd, STI);
dup2(fd, STO);
{
/* build command-line */
char *c, *ce;
const char *s;
int n;
va_list vls;
c = cmd;
ce = cmd + sizeof(cmd) - 1;
va_start(vls, fd);
while ( (s = va_arg(vls, const char *)) ) {
n = strlen(s);
if ( c + n + 1 >= ce ) break;
memcpy(c, s, n); c += n;
*c++ = ' ';
}
va_end(vls);
*c = '\0';
}
/* run extenral command */
fd_printf(STDERR_FILENO, "%s\n", cmd);
r = system(cmd);
if ( WIFEXITED(r) ) exit(WEXITSTATUS(r));
else exit(128);
}
}
/**********************************************************************/
#define TTY_Q_SZ 256
struct tty_q {
int len;
unsigned char buff[TTY_Q_SZ];
} tty_q;
/**********************************************************************/
void send_file_completion(const char *buf, linenoiseCompletions *lc) {
DIR *dirp;
struct dirent *dp;
char *basec, *basen, *dirc, *dirn;
int baselen, dirlen;
char *fullpath;
struct stat filestat;
basec = strdup(buf);
dirc = strdup(buf);
dirn = dirname(dirc);
dirlen = strlen(dirn);
basen = basename(basec);
baselen = strlen(basen);
dirp = opendir(dirn);
if (dirp) {
while ((dp = readdir(dirp)) != NULL) {
if (strncmp(basen, dp->d_name, baselen) == 0) {
/* add 2 extra bytes for possible / in middle & at end */
fullpath = (char *) malloc(strlen(dp->d_name) + dirlen + 3);
strcpy(fullpath, dirn);
if (fullpath[dirlen-1] != '/')
strcat(fullpath, "/");
strcat(fullpath, dp->d_name);
if (stat(fullpath, &filestat) == 0) {
if (S_ISDIR(filestat.st_mode)) {
strcat(fullpath, "/");
}
linenoiseAddCompletion(lc,fullpath);
}
free(fullpath);
}
}
closedir(dirp);
}
free(basec);
free(dirc);
}
/* file for storing command history for send/receive */
#define SEND_RECEIVE_HISTORY_FILENAME ".picocomsendreceive"
static char *send_receive_history_file_path = NULL;
void init_send_receive_history()
{
char *home_directory;
home_directory = getenv("HOME");
if (home_directory) {
send_receive_history_file_path =
malloc(strlen(home_directory) + 2 +
strlen(SEND_RECEIVE_HISTORY_FILENAME));
strcat(send_receive_history_file_path, home_directory);
if (home_directory[strlen(home_directory)-1] != '/') {
strcat(send_receive_history_file_path, "/");
}
strcat(send_receive_history_file_path, SEND_RECEIVE_HISTORY_FILENAME);
linenoiseHistoryLoad(send_receive_history_file_path);
}
}
void cleanup_send_receive_history()
{
if (send_receive_history_file_path)
free(send_receive_history_file_path);
}
void add_send_receive_history(char *fname)
{
linenoiseHistoryAdd(fname);
if (send_receive_history_file_path)
linenoiseHistorySave(send_receive_history_file_path);
}
char *read_send_filename()
{
char *fname;
linenoiseSetCompletionCallback(send_file_completion);
printf("\r\n");
fname = linenoise("*** file: ");
printf("\r\n");
linenoiseSetCompletionCallback(NULL);
if (fname != NULL)
add_send_receive_history(fname);
return fname;
}
char *read_receive_filename()
{
printf("\r\n");
char *fname = linenoise("*** file: ");
printf("\r\n");
if (fname != NULL)
add_send_receive_history(fname);
return fname;
}
/**********************************************************************/
void
loop(void)
{
enum {
ST_COMMAND,
ST_TRANSPARENT
} state;
int dtr_up;
fd_set rdset, wrset;
int newbaud, newflow, newparity, newbits;
char *newflow_str, *newparity_str;
char *fname;
int r, n;
unsigned char c;
tty_q.len = 0;
state = ST_TRANSPARENT;
dtr_up = 0;
for (;;) {
FD_ZERO(&rdset);
FD_ZERO(&wrset);
FD_SET(STI, &rdset);
FD_SET(tty_fd, &rdset);
if ( tty_q.len ) FD_SET(tty_fd, &wrset);
if (select(tty_fd + 1, &rdset, &wrset, NULL, NULL) < 0)
fatal("select failed: %d : %s", errno, strerror(errno));
if ( FD_ISSET(STI, &rdset) ) {
/* read from terminal */
do {
n = read(STI, &c, 1);
} while (n < 0 && errno == EINTR);
if (n == 0) {
fatal("stdin closed");
} else if (n < 0) {
/* is this really necessary? better safe than sory! */
if ( errno != EAGAIN && errno != EWOULDBLOCK )
fatal("read from stdin failed: %s", strerror(errno));
else
goto skip_proc_STI;
}
switch (state) {
case ST_COMMAND:
if ( c == opts.escape ) {
state = ST_TRANSPARENT;
/* pass the escape character down */
if (tty_q.len + M_MAXMAP <= TTY_Q_SZ) {
n = do_map((char *)tty_q.buff + tty_q.len,
opts.omap, c);
tty_q.len += n;
if ( opts.lecho )
map_and_write(STO, opts.emap, c);
} else
fd_printf(STO, "\x07");
break;
}
state = ST_TRANSPARENT;
switch (c) {
case KEY_EXIT:
return;
case KEY_QUIT:
term_set_hupcl(tty_fd, 0);
term_flush(tty_fd);
term_apply(tty_fd);
term_erase(tty_fd);
return;
case KEY_STATUS:
fd_printf(STO, "\r\n");
fd_printf(STO, "*** baud: %d\r\n", opts.baud);
fd_printf(STO, "*** flow: %s\r\n", opts.flow_str);
fd_printf(STO, "*** parity: %s\r\n", opts.parity_str);
fd_printf(STO, "*** databits: %d\r\n", opts.databits);
fd_printf(STO, "*** dtr: %s\r\n", dtr_up ? "up" : "down");
break;
case KEY_PULSE:
fd_printf(STO, "\r\n*** pulse DTR ***\r\n");
if ( term_pulse_dtr(tty_fd) < 0 )
fd_printf(STO, "*** FAILED\r\n");
break;
case KEY_TOGGLE:
if ( dtr_up )
r = term_lower_dtr(tty_fd);
else
r = term_raise_dtr(tty_fd);
if ( r >= 0 ) dtr_up = ! dtr_up;
fd_printf(STO, "\r\n*** DTR: %s ***\r\n",
dtr_up ? "up" : "down");
break;
case KEY_BAUD_UP:
newbaud = baud_up(opts.baud);
term_set_baudrate(tty_fd, newbaud);
tty_q.len = 0; term_flush(tty_fd);
if ( term_apply(tty_fd) >= 0 ) opts.baud = newbaud;
fd_printf(STO, "\r\n*** baud: %d ***\r\n", opts.baud);
break;
case KEY_BAUD_DN:
newbaud = baud_down(opts.baud);
term_set_baudrate(tty_fd, newbaud);
tty_q.len = 0; term_flush(tty_fd);
if ( term_apply(tty_fd) >= 0 ) opts.baud = newbaud;
fd_printf(STO, "\r\n*** baud: %d ***\r\n", opts.baud);
break;
case KEY_FLOW:
newflow = flow_next(opts.flow, &newflow_str);
term_set_flowcntrl(tty_fd, newflow);
tty_q.len = 0; term_flush(tty_fd);
if ( term_apply(tty_fd) >= 0 ) {
opts.flow = newflow;
opts.flow_str = newflow_str;
}
fd_printf(STO, "\r\n*** flow: %s ***\r\n", opts.flow_str);
break;
case KEY_PARITY:
newparity = parity_next(opts.parity, &newparity_str);
term_set_parity(tty_fd, newparity);
tty_q.len = 0; term_flush(tty_fd);
if ( term_apply(tty_fd) >= 0 ) {
opts.parity = newparity;
opts.parity_str = newparity_str;
}
fd_printf(STO, "\r\n*** parity: %s ***\r\n",
opts.parity_str);
break;
case KEY_BITS:
newbits = bits_next(opts.databits);
term_set_databits(tty_fd, newbits);
tty_q.len = 0; term_flush(tty_fd);
if ( term_apply(tty_fd) >= 0 ) opts.databits = newbits;
fd_printf(STO, "\r\n*** databits: %d ***\r\n",
opts.databits);
break;
case KEY_LECHO:
opts.lecho = ! opts.lecho;
fd_printf(STO, "\r\n*** local echo: %s ***\r\n",
opts.lecho ? "yes" : "no");
break;
case KEY_SEND:
fname = read_send_filename();
if (fname == NULL)
fatal("cannot read filename: %s", strerror(errno));
run_cmd(tty_fd, opts.send_cmd, fname, NULL);
free(fname);
break;
case KEY_RECEIVE:
fname = read_receive_filename();
if (fname == NULL)
fatal("cannot read filename: %s", strerror(errno));
if ( fname[0] )
run_cmd(tty_fd, opts.receive_cmd, fname, NULL);
else
run_cmd(tty_fd, opts.receive_cmd, NULL);
free(fname);
break;
case KEY_BREAK:
term_break(tty_fd);
fd_printf(STO, "\r\n*** break sent ***\r\n");
break;
default:
break;
}
break;
case ST_TRANSPARENT:
if ( c == opts.escape ) {
state = ST_COMMAND;
} else {
if (tty_q.len + M_MAXMAP <= TTY_Q_SZ) {
n = do_map((char *)tty_q.buff + tty_q.len,
opts.omap, c);
tty_q.len += n;
if ( opts.lecho )
map_and_write(STO, opts.emap, c);
} else
fd_printf(STO, "\x07");
}
break;
default:
assert(0);
break;
}
}
skip_proc_STI:
if ( FD_ISSET(tty_fd, &rdset) ) {
/* read from port */
do {
n = read(tty_fd, &c, 1);
} while (n < 0 && errno == EINTR);
if (n == 0) {
fatal("term closed");
} else if ( n < 0 ) {
if ( errno != EAGAIN && errno != EWOULDBLOCK )
fatal("read from term failed: %s", strerror(errno));
} else {
map_and_write(STO, opts.imap, c);
}
}
if ( FD_ISSET(tty_fd, &wrset) ) {
/* write to port */
do {
n = write(tty_fd, tty_q.buff, tty_q.len);
} while ( n < 0 && errno == EINTR );
if ( n <= 0 )
fatal("write to term failed: %s", strerror(errno));
memcpy(tty_q.buff, tty_q.buff + n, tty_q.len - n);
tty_q.len -= n;
}
}
}
/**********************************************************************/
void
deadly_handler(int signum)
{
kill(0, SIGTERM);
sleep(1);
#ifdef UUCP_LOCK_DIR
uucp_unlock();
#endif
exit(EXIT_FAILURE);
}
void
establish_signal_handlers (void)
{
struct sigaction exit_action, ign_action;
/* Set up the structure to specify the exit action. */
exit_action.sa_handler = deadly_handler;
sigemptyset (&exit_action.sa_mask);
exit_action.sa_flags = 0;
/* Set up the structure to specify the ignore action. */
ign_action.sa_handler = SIG_IGN;
sigemptyset (&ign_action.sa_mask);
ign_action.sa_flags = 0;
sigaction (SIGTERM, &exit_action, NULL);
sigaction (SIGINT, &ign_action, NULL);
sigaction (SIGHUP, &ign_action, NULL);
sigaction (SIGALRM, &ign_action, NULL);
sigaction (SIGUSR1, &ign_action, NULL);
sigaction (SIGUSR2, &ign_action, NULL);
sigaction (SIGPIPE, &ign_action, NULL);
}
/**********************************************************************/
void
show_usage(char *name)
{
char *s;
s = strrchr(name, '/');
s = s ? s+1 : name;
printf("picocom v%s\n", VERSION_STR);
printf("Usage is: %s [options] <tty device>\n", s);
printf("Options are:\n");
printf(" --<b>aud <baudrate>\n");
printf(" --<f>low s (=soft) | h (=hard) | n (=none)\n");
printf(" --<p>arity o (=odd) | e (=even) | n (=none)\n");
printf(" --<d>atabits 5 | 6 | 7 | 8\n");