// Handler for SIGCHLD
static void SIGCHLD_handler(int sig)
{
if(sig == SIGCHLD)
{
cleanup_terminated_children();
}
else
printf("SERIOUS ERROR: SIGCHLD_handler received signal %d\n", sig);
}
int main(int argc, char *argv[])
{
int ret = EXIT_SUCCESS;
int ch;
char cmdline[MAX_LINE]; /* command line */
int interactive = 0;
char* infile_name = NULL;
char* program_name = argv[0];
install_signal_handler(SIGINT, INThandler);
FILE* infile = NULL;
/* parse the command line options */
while ((ch = getopt(argc, argv, "hvids:")) != -1)
{
switch (ch)
{
case 'h':
usage(argv[0], EXIT_SUCCESS);
break;
case 'i': /* interactive mode */
interactive = 1;
break;
case 's':
infile_name = strdup(optarg);
interactive = 0;
break;
case 'd':
pr7_debug = 1;
break;
case 'v':
verbose = 1;
break;
case '?':
printf("%s: invalid option '%c'\n", argv[0], optopt);
usage(argv[0], EXIT_FAILURE);
break;
case ':':
printf("%s: invalid option '%c' (missing argument)\n", argv[0], optopt);
usage(argv[0], EXIT_FAILURE);
break;
default:
usage(argv[0], EXIT_FAILURE);
break;
}
}
program_name = argv[0];
if (interactive || (optind >= argc && infile_name == NULL))
{
infile = stdin;
infile_name = "[stdin]";
}
else
{
if (NULL == infile_name)
{
infile_name = strdup(argv[optind]);
}
infile = fopen(infile_name, "r");
if (NULL == infile)
{
fprintf(stderr, "%s: cannot open file %s: %s\n",
program_name, infile_name, strerror(errno));
exit(EXIT_FAILURE);
}
}
printf("%s\n", infile_name);
line_num = 0;
while (1)
{
char* succ;
++line_num;
/* issue prompt and read command line */
if (infile == stdin) printf("%s %d%% ", program_name, line_num);
succ = fgets(cmdline, MAX_LINE, infile);
cleanup_terminated_children();
if (succ != NULL)
{
ret = eval_line(cmdline);
}
if (feof(infile)) /* end of file */
{
break;
}
}
return ret;
}