1 files changed, 116 insertions, 0 deletions
diff --git a/src/libunixonacid/textclient_start.c b/src/libunixonacid/textclient_start.c
new file mode 100644
index 0000000..8cb7bcd
--- /dev/null
+++ b/src/libunixonacid/textclient_start.c
@@ -0,0 +1,116 @@
+/* ISC license. */
+
+#include <skalibs/sysdeps.h>
+#include <skalibs/nonposix.h>
+#include <sys/uio.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/socket.h>
+#include <skalibs/error.h>
+#include <skalibs/allreadwrite.h>
+#include <skalibs/webipc.h>
+#include <skalibs/djbunix.h>
+#include <skalibs/unix-timed.h>
+#include <skalibs/textmessage.h>
+#include <skalibs/textclient.h>
+
+union aligner_u
+{
+  struct cmsghdr cmsghdr ;
+  int i ;
+} ;
+
+static int getfd (void *p)
+{
+  return ((int *)p)[0] ;
+}
+
+static ssize_t get (void *p)
+{
+  static int const awesomeflags =
+#ifdef SKALIBS_HASMSGDONTWAIT
+    MSG_DONTWAIT
+#else
+    0
+#endif
+    |
+#ifdef SKALIBS_HASCMSGCLOEXEC
+    MSG_CMSG_CLOEXEC
+#else
+    0
+#endif
+    ;
+  struct cmsghdr *c ;
+  int *fd = p ;
+  ssize_t r ;
+  union aligner_u ancilbuf[1 + (CMSG_SPACE(sizeof(int)) - 1) / sizeof(union aligner_u)] ;
+  char ch ;
+  struct iovec v = { .iov_base = &ch, .iov_len = 1 } ;
+  struct msghdr msghdr =
+  {
+    .msg_name = 0,
+    .msg_namelen = 0,
+    .msg_iov = &v,
+    .msg_iovlen = 1,
+    .msg_flags = 0,
+    .msg_control = ancilbuf,
+    .msg_controllen = CMSG_SPACE(sizeof(int))
+  } ;
+  do r = recvmsg(fd[0], &msghdr, awesomeflags) ;
+  while (r < 0 && errno == EINTR) ;
+  if (r <= 0) return sanitize_read(r) ;
+  c = CMSG_FIRSTHDR(&msghdr) ;
+  if (ch != '|'
+   || !c
+   || c->cmsg_level != SOL_SOCKET
+   || c->cmsg_type != SCM_RIGHTS
+   || (size_t)(c->cmsg_len - (CMSG_DATA(c) - (unsigned char *)c)) != sizeof(int)) return (errno = EPROTO, -1) ;
+#ifndef SKALIBS_HASCMSGCLOEXEC
+  if (coe(*(int *)CMSG_DATA(c)) < 0)
+  {
+    fd_close(*(int *)CMSG_DATA(c)) ;
+    return -1 ;
+  }
+#endif
+  fd[1] = *(int *)CMSG_DATA(c) ;
+  return 1 ;
+}
+
+
+int textclient_start (textclient_t *a, char const *path, uint32_t options, char const *before, size_t beforelen, char const *after, size_t afterlen, tain_t const *deadline, tain_t *stamp)
+{
+  struct iovec v ;
+  int fd[2] ;
+  ssize_t r ;
+  fd[0] = ipc_stream_nbcoe() ;
+  if (fd[0] < 0) return 0 ;
+  if (!ipc_timed_connect(fd[0], path, deadline, stamp)) goto err ;
+  textmessage_sender_init(&a->syncout, fd[0]) ;
+  if (!textmessage_timed_send(&a->syncout, before, beforelen, deadline, stamp)) goto ferr ;
+  textmessage_receiver_init(&a->syncin, fd[0], a->syncbuf, TEXTCLIENT_BUFSIZE, TEXTMESSAGE_MAXLEN) ;
+  r = timed_get(fd, &getfd, &get, deadline, stamp) ;
+  if (!r) errno = EPIPE ;
+  if (r <= 0) goto aerr ;
+  if (sanitize_read(textmessage_timed_receive(&a->syncin, &v, deadline, stamp)) <= 0) goto perr ;
+  if (v.iov_len != afterlen || memcmp(v.iov_base, after, afterlen)) { errno = EPROTO ; goto perr ; }
+  textmessage_receiver_init(&a->asyncin, fd[1], a->asyncbuf, TEXTCLIENT_BUFSIZE, TEXTMESSAGE_MAXLEN) ;
+  if (sanitize_read(textmessage_timed_receive(&a->asyncin, &v, deadline, stamp)) <= 0) goto serr ;
+  if (v.iov_len != afterlen || memcmp(v.iov_base, after, afterlen)) goto berr ;
+  a->pid = 0 ;
+  a->options = options & ~TEXTCLIENT_OPTION_WAITPID ;
+  return 1 ;
+
+ berr:
+  errno = EPROTO ;
+ serr:
+  textmessage_receiver_free(&a->asyncin) ;
+ perr:
+  fd_close(fd[1]) ;
+ aerr:
+  textmessage_receiver_free(&a->syncin) ;
+ ferr:
+  textmessage_sender_free(&a->syncout) ;
+ err:
+  fd_close(fd[0]) ;
+  return 0 ;
+}