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This commit is contained in:
Ben Gras
2005-08-05 16:48:44 +00:00
parent e396496d8c
commit 73847b7d50
4 changed files with 33 additions and 23 deletions
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35
test/select/test14.c
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@@ -30,6 +30,9 @@ void pipehandler(int sig)
}
#define CHILDFD 1
#define PARENTFD 0
void do_child(int pty_fds[])
{
/* reads from pipe and prints out the data */
@@ -43,38 +46,38 @@ void do_child(int pty_fds[])
signal(SIGUSR1, pipehandler);
/* first, close the write part, since it is not needed */
close(pty_fds[1]);
close(pty_fds[PARENTFD]);
while(1) {
FD_ZERO(&fds_read);
FD_ZERO(&fds_exception);
FD_SET(pty_fds[0], &fds_read);
FD_SET(pty_fds[0], &fds_exception);
FD_SET(pty_fds[CHILDFD], &fds_read);
FD_SET(pty_fds[CHILDFD], &fds_exception);
timeout.tv_sec = 5;
timeout.tv_usec = 0;
retval = select(pty_fds[0]+1, &fds_read, NULL, &fds_exception, &timeout);
retval = select(pty_fds[CHILDFD]+1, &fds_read, NULL, &fds_exception, &timeout);
if (retval == -1) {
perror("select");
fprintf(stderr, "child: Error in select\n");
continue;
} else printf("child select: %d\n", retval);
if (FD_ISSET(pty_fds[0], &fds_exception)) {
if (FD_ISSET(pty_fds[CHILDFD], &fds_exception)) {
printf("child: exception fd set. quitting.\n");
break;
}
if (FD_ISSET(pty_fds[0], &fds_read)) {
if (FD_ISSET(pty_fds[CHILDFD], &fds_read)) {
printf("child: read fd set. reading.\n");
if ((retval = read(pty_fds[0], data, sizeof(data))) < 0) {
if ((retval = read(pty_fds[CHILDFD], data, sizeof(data))) < 0) {
perror("read");
fprintf(stderr, "child: couldn't read from pipe\n");
fprintf(stderr, "child: couldn't read from pty\n");
exit(-1);
}
if(retval == 0) {
fprintf(stderr, "child: eof on pipe\n");
fprintf(stderr, "child: eof on pty\n");
break;
}
data[retval] = '\0';
printf("pid %d eipe reads (%d): %s\n", getpid(), retval, data);
printf("pid %d pty reads (%d): %s\n", getpid(), retval, data);
} else printf("child: no fd set\n");
}
@@ -91,15 +94,15 @@ void do_parent(int pty_fds[])
signal(SIGUSR1, pipehandler);
/* first, close the read part of pty, since it is not needed */
close(pty_fds[0]);
close(pty_fds[CHILDFD]);
/* now enter a loop of read user input, and writing it to the pty */
while (1) {
FD_ZERO(&fds_write);
FD_SET(pty_fds[1], &fds_write);
FD_SET(pty_fds[PARENTFD], &fds_write);
printf("pid %d Waiting for pty ready to write on %s...\n",
getpid(), name);
retval = select(pty_fds[1]+1, NULL, &fds_write, NULL, NULL);
retval = select(pty_fds[PARENTFD]+1, NULL, &fds_write, NULL, NULL);
if (retval == -1) {
perror("select");
fprintf(stderr, "Parent: Error in select\n");
@@ -113,11 +116,11 @@ void do_parent(int pty_fds[])
}
if (!strcmp(data, "exit"))
break;
if (!FD_ISSET(pty_fds[1], &fds_write)) {
if (!FD_ISSET(pty_fds[PARENTFD], &fds_write)) {
fprintf(stderr, "parent: write fd not set?! retrying\n");
continue;
}
retval = write(pty_fds[1], &data, 1024);
retval = write(pty_fds[PARENTFD], &data, 1024);
if (retval == -1) {
perror("write");
fprintf(stderr, "Error writing on pty\n");
@@ -126,7 +129,7 @@ void do_parent(int pty_fds[])
}
/* got exit from user */
close(pty_fds[1]); /* close pty, let child know we're done */
close(pty_fds[PARENTFD]); /* close pty, let child know we're done */
wait(&retval);
printf("Child exited with status: %d\n", retval);
exit(0);