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- add ash read -t timeout support. initial code provided by Tim Yamin on Oct/21/2004 on the busybox mailing list. Edited his code a little to keep syntax highlighers happy and make it optional when CONFIG_ASH_TIMEOUT is defined

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This commit is contained in:
Ned Ludd 2005-02-09 21:07:23 +00:00
parent 8063d5ca25
commit 2123b7cded
2 changed files with 74 additions and 3 deletions
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11
shell/Config.in
View File

@ -53,6 +53,17 @@ config CONFIG_ASH_JOB_CONTROL
help
Enable job control in the ash shell.
config CONFIG_ASH_TIMEOUT
bool " Enable read timeout support."
default n
depends on CONFIG_ASH_JOB_CONTROL
help
This option provides read -t <seconds> support.
read builtin which allows the function to pass control back
if no character input is read from the terminal within a set
number of seconds.
config CONFIG_ASH_ALIAS
bool " Enable alias support"
default y

66
shell/ash.c
View File

@ -12583,17 +12583,34 @@ readcmd(int argc, char **argv)
char *prompt;
const char *ifs;
char *p;
#if defined(CONFIG_ASH_TIMEOUT) && JOBS
fd_set set;
int timeout;
struct timeval timeout_struct;
struct termios tty, old_tty;
#endif
int startword;
int status;
int i;
rflag = 0;
prompt = NULL;
while ((i = nextopt("p:r")) != '\0') {
#if defined(CONFIG_ASH_TIMEOUT) && JOBS
timeout = 0;
while ((i = nextopt("p:rt:")) != '\0')
#else
while ((i = nextopt("p:r")) != '\0')
#endif
{
if (i == 'p')
prompt = optionarg;
else
else if (i == 'r')
rflag = 1;
#if defined(CONFIG_ASH_TIMEOUT) && JOBS
else
timeout = atoi(optionarg);
#endif
}
if (prompt && isatty(0)) {
out2str(prompt);
@ -12602,11 +12619,54 @@ readcmd(int argc, char **argv)
error("arg count");
if ((ifs = bltinlookup("IFS")) == NULL)
ifs = defifs;
#if defined(CONFIG_ASH_TIMEOUT) && JOBS
c = 0;
#endif
status = 0;
startword = 1;
backslash = 0;
STARTSTACKSTR(p);
for (;;) {
#if defined(CONFIG_ASH_TIMEOUT) && JOBS
if (timeout > 0) {
tcgetattr(0, &tty);
old_tty = tty;
/* cfmakeraw(...) disables too much; we just do this instead. */
tty.c_lflag &= ~(ECHO|ECHONL|ICANON|IEXTEN);
tcsetattr(0, TCSANOW, &tty);
FD_ZERO (&set);
FD_SET (0, &set);
timeout_struct.tv_sec = timeout;
timeout_struct.tv_usec = 0;
i = select (FD_SETSIZE, &set, NULL, NULL, &timeout_struct);
if(i == 1)
{
read(0, &c, 1);
if(c == '\n' || c == 4) /* Handle newlines and EOF */
i = 0; /* Don't read further... */
else
STPUTC(c, p); /* Keep reading... */
}
tcsetattr(0, TCSANOW, &old_tty);
/* Echo the character so the user knows it was read...
Yes, this can be done by setting the ECHO flag, but that
echoes ^D and other control characters at this state */
if(c != 0)
write(1, &c, 1);
} else
i = 1;
for (;i == 1;)
#else
for (;;)
#endif
{
if (read(0, &c, 1) != 1) {
status = 1;
break;