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upstream: switch mainloop from select(2) to poll(2); ok deraadt@

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OpenBSD-Commit-ID: 37645419a330037d297f6f0adc3b3663e7ae7b2e
This commit is contained in:
djm@openbsd.org 2019-01-23 02:01:10 +00:00 committed by Damien Miller
parent bb956eaa94
commit 2c223878e5
1 changed files with 19 additions and 23 deletions
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42
ssh-pkcs11-helper.c
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@ -1,4 +1,4 @@
/* $OpenBSD: ssh-pkcs11-helper.c,v 1.16 2019/01/21 12:53:35 djm Exp $ */
/* $OpenBSD: ssh-pkcs11-helper.c,v 1.17 2019/01/23 02:01:10 djm Exp $ */
/*
* Copyright (c) 2010 Markus Friedl. All rights reserved.
*
@ -24,10 +24,11 @@
#include "openbsd-compat/sys-queue.h"
#include <errno.h>
#include <poll.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include "xmalloc.h"
#include "sshbuf.h"
@ -311,14 +312,13 @@ cleanup_exit(int i)
int
main(int argc, char **argv)
{
fd_set *rset, *wset;
int r, ch, in, out, max, log_stderr = 0;
ssize_t len, olen, set_size;
ssize_t len;
SyslogFacility log_facility = SYSLOG_FACILITY_AUTH;
LogLevel log_level = SYSLOG_LEVEL_ERROR;
char buf[4*4096];
extern char *__progname;
struct pollfd pfd[2];
ssh_malloc_init(); /* must be called before any mallocs */
__progname = ssh_get_progname(argv[0]);
@ -360,13 +360,10 @@ main(int argc, char **argv)
if ((oqueue = sshbuf_new()) == NULL)
fatal("%s: sshbuf_new failed", __func__);
set_size = howmany(max + 1, NFDBITS) * sizeof(fd_mask);
rset = xmalloc(set_size);
wset = xmalloc(set_size);
for (;;) {
memset(rset, 0, set_size);
memset(wset, 0, set_size);
while (1) {
memset(pfd, 0, sizeof(pfd));
pfd[0].fd = in;
pfd[1].fd = out;
/*
* Ensure that we can read a full buffer and handle
@ -375,23 +372,21 @@ main(int argc, char **argv)
*/
if ((r = sshbuf_check_reserve(iqueue, sizeof(buf))) == 0 &&
(r = sshbuf_check_reserve(oqueue, MAX_MSG_LENGTH)) == 0)
FD_SET(in, rset);
pfd[0].events = POLLIN;
else if (r != SSH_ERR_NO_BUFFER_SPACE)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
olen = sshbuf_len(oqueue);
if (olen > 0)
FD_SET(out, wset);
if (sshbuf_len(oqueue) > 0)
pfd[1].events = POLLOUT;
if (select(max+1, rset, wset, NULL, NULL) < 0) {
if (errno == EINTR)
if ((r = poll(pfd, 2, -1 /* INFTIM */)) <= 0) {
if (r == 0 || errno == EINTR)
continue;
error("select: %s", strerror(errno));
cleanup_exit(2);
fatal("poll: %s", strerror(errno));
}
/* copy stdin to iqueue */
if (FD_ISSET(in, rset)) {
if ((pfd[0].revents & (POLLIN|POLLERR)) != 0) {
len = read(in, buf, sizeof buf);
if (len == 0) {
debug("read eof");
@ -405,8 +400,9 @@ main(int argc, char **argv)
}
}
/* send oqueue to stdout */
if (FD_ISSET(out, wset)) {
len = write(out, sshbuf_ptr(oqueue), olen);
if ((pfd[1].revents & (POLLOUT|POLLHUP)) != 0) {
len = write(out, sshbuf_ptr(oqueue),
sshbuf_len(oqueue));
if (len < 0) {
error("write: %s", strerror(errno));
cleanup_exit(1);