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fbsplash: more compact support for named pipes + EOF scenario

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function                                             old     new   delta
fbsplash_main                                       1121    1043     -78
This commit is contained in:
Denis Vlasenko 2008-04-04 20:38:49 +00:00
parent 7b6d9d687d
commit 7f8f0fafdb
1 changed files with 34 additions and 47 deletions
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53
miscutils/fbsplash.c
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@ -360,6 +360,8 @@ int fbsplash_main(int argc ATTRIBUTE_UNUSED, char **argv)
{
const char *fb_device, *cfg_filename, *fifo_filename;
FILE *fp = fp; // for compiler
char *num_buf;
unsigned num;
bool bCursorOff;
INIT_G();
@ -392,11 +394,20 @@ int fbsplash_main(int argc ATTRIBUTE_UNUSED, char **argv)
return EXIT_SUCCESS;
fp = xfopen_stdin(fifo_filename);
while (1) {
struct stat statbuf;
unsigned num;
char *num_buf;
if (fp != stdin) {
// For named pipes, we want to support this:
// mkfifo cmd_pipe
// fbsplash -f cmd_pipe .... &
// ...
// echo 33 >cmd_pipe
// ...
// echo 66 >cmd_pipe
// This means that we don't want fbsplash to get EOF
// when last writer closes input end.
// The simplest way is to open fifo for writing too
// and become an additional writer :)
open(fifo_filename, O_WRONLY); // errors are ignored
}
fb_drawprogressbar(0);
// Block on read, waiting for some input.
@ -406,12 +417,7 @@ int fbsplash_main(int argc ATTRIBUTE_UNUSED, char **argv)
while ((num_buf = xmalloc_fgetline(fp)) != NULL) {
if (strncmp(num_buf, "exit", 4) == 0) {
DEBUG_MESSAGE("exit");
exit_cmd:
if (bCursorOff) {
// restore cursor
full_write(STDOUT_FILENO, "\x1b" "[?25h", 6);
}
return EXIT_SUCCESS;
break;
}
num = atoi(num_buf);
if (isdigit(num_buf[0]) && (num <= 100)) {
@ -424,28 +430,9 @@ int fbsplash_main(int argc ATTRIBUTE_UNUSED, char **argv)
}
free(num_buf);
}
// We got EOF/error on fp
if (ferror(fp))
goto exit_cmd;
fclose(fp);
if (LONE_DASH(fifo_filename)
|| stat(fifo_filename, &statbuf) != 0
|| !S_ISFIFO(statbuf.st_mode)
) {
goto exit_cmd;
}
// It's really a named pipe!
// For named pipes, we want to support this:
// mkfifo cmd_pipe
// fbsplash -f cmd_pipe .... &
// ...
// echo 33 >cmd_pipe
// ...
// echo 66 >cmd_pipe
// This means that on EOF, we need to close/open cmd_pipe
// (just reading again works too, but it hogs CPU)
fp = xfopen_stdin(fifo_filename); // blocks on open
} // end of while (1)
if (bCursorOff) // restore cursor
full_write(STDOUT_FILENO, "\x1b" "[?25h", 6);
return EXIT_SUCCESS;
}