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Add SIGCONT signal handler to reinitialize console after doing CTRL+Z / fg, as under Linux/bash stdin seems to lose O_NONBLOCK flag as well as all tcsetattr() attributes after foregrounding

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This commit is contained in:
Thilo Schulz 2009-10-24 12:01:29 +00:00
parent 3c501df298
commit c312449422
1 changed files with 36 additions and 22 deletions
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56
code/sys/con_tty.c
View file

@ -70,7 +70,7 @@ FIXME relevant?
static void CON_FlushIn( void )
{
char key;
while (read(0, &key, 1)!=-1);
while (read(STDIN_FILENO, &key, 1)!=-1);
}
/*
@ -90,11 +90,11 @@ static void CON_Back( void )
size_t size;
key = '\b';
size = write(1, &key, 1);
size = write(STDOUT_FILENO, &key, 1);
key = ' ';
size = write(1, &key, 1);
size = write(STDOUT_FILENO, &key, 1);
key = '\b';
size = write(1, &key, 1);
size = write(STDOUT_FILENO, &key, 1);
}
/*
@ -146,12 +146,12 @@ static void CON_Show( void )
if (ttycon_hide == 0)
{
size_t size;
size = write( 1, "]", 1 );
size = write(STDOUT_FILENO, "]", 1);
if (TTY_con.cursor)
{
for (i=0; i<TTY_con.cursor; i++)
{
size = write(1, TTY_con.buffer+i, 1);
size = write(STDOUT_FILENO, TTY_con.buffer+i, 1);
}
}
}
@ -170,11 +170,11 @@ void CON_Shutdown( void )
if (ttycon_on)
{
CON_Back(); // Delete "]"
tcsetattr (0, TCSADRAIN, &TTY_tc);
tcsetattr (STDIN_FILENO, TCSADRAIN, &TTY_tc);
}
// Restore blocking to stdin reads
fcntl( 0, F_SETFL, fcntl( 0, F_GETFL, 0 ) & ~O_NONBLOCK );
fcntl(STDIN_FILENO, F_SETFL, fcntl(STDIN_FILENO, F_GETFL, 0) & ~O_NONBLOCK);
}
/*
@ -245,6 +245,19 @@ field_t *Hist_Next( void )
return &(ttyEditLines[hist_current]);
}
/*
==================
CON_SigCont
Reinitialize console input after receiving SIGCONT, as on Linux the terminal seems to lose all
set attributes if user did CTRL+Z and then does fg again.
==================
*/
void CON_SigCont(int signum)
{
CON_Init();
}
/*
==================
CON_Init
@ -262,8 +275,11 @@ void CON_Init( void )
signal(SIGTTIN, SIG_IGN);
signal(SIGTTOU, SIG_IGN);
// If SIGCONT is received, reinitialize console
signal(SIGCONT, CON_SigCont);
// Make stdin reads non-blocking
fcntl( 0, F_SETFL, fcntl( 0, F_GETFL, 0 ) | O_NONBLOCK );
fcntl(STDIN_FILENO, F_SETFL, fcntl(STDIN_FILENO, F_GETFL, 0) | O_NONBLOCK );
if (isatty(STDIN_FILENO) != 1
|| (term && (!strcmp(term, "raw") || !strcmp(term, "dumb"))))
@ -275,7 +291,7 @@ void CON_Init( void )
}
Field_Clear(&TTY_con);
tcgetattr (0, &TTY_tc);
tcgetattr (STDIN_FILENO, &TTY_tc);
TTY_erase = TTY_tc.c_cc[VERASE];
TTY_eof = TTY_tc.c_cc[VEOF];
tc = TTY_tc;
@ -298,7 +314,7 @@ void CON_Init( void )
tc.c_iflag &= ~(ISTRIP | INPCK);
tc.c_cc[VMIN] = 1;
tc.c_cc[VTIME] = 0;
tcsetattr (0, TCSADRAIN, &tc);
tcsetattr (STDIN_FILENO, TCSADRAIN, &tc);
ttycon_on = qtrue;
}
@ -316,9 +332,9 @@ char *CON_Input( void )
field_t *history;
size_t size;
if( ttycon_on )
if(ttycon_on)
{
avail = read(0, &key, 1);
avail = read(STDIN_FILENO, &key, 1);
if (avail != -1)
{
// we have something
@ -355,13 +371,13 @@ char *CON_Input( void )
CON_Show();
return NULL;
}
avail = read(0, &key, 1);
avail = read(STDIN_FILENO, &key, 1);
if (avail != -1)
{
// VT 100 keys
if (key == '[' || key == 'O')
{
avail = read(0, &key, 1);
avail = read(STDIN_FILENO, &key, 1);
if (avail != -1)
{
switch (key)
@ -407,7 +423,7 @@ char *CON_Input( void )
TTY_con.buffer[TTY_con.cursor] = key;
TTY_con.cursor++;
// print the current line (this is differential)
size = write(1, &key, 1);
size = write(STDOUT_FILENO, &key, 1);
}
return NULL;
@ -419,15 +435,13 @@ char *CON_Input( void )
struct timeval timeout;
FD_ZERO(&fdset);
FD_SET(0, &fdset); // stdin
FD_SET(STDIN_FILENO, &fdset); // stdin
timeout.tv_sec = 0;
timeout.tv_usec = 0;
if (select (1, &fdset, NULL, NULL, &timeout) == -1 || !FD_ISSET(0, &fdset))
{
if(select (STDIN_FILENO + 1, &fdset, NULL, NULL, &timeout) == -1 || !FD_ISSET(STDIN_FILENO, &fdset))
return NULL;
}
len = read (0, text, sizeof(text));
len = read(STDIN_FILENO, text, sizeof(text));
if (len == 0)
{ // eof!
stdin_active = qfalse;