[gdbsupport] Add gdb::{waitpid,read,write,close}

We have gdb::handle_eintr, which allows us to rewrite:
...
  ssize_t ret;
    do
      {
        errno = 0;
        ret = ::write (pipe[1], "+", 1);
      }
    while (ret == -1 && errno == EINTR);
...
into:
...
  ssize_t ret = gdb::handle_eintr (-1, ::write, pipe[1], "+", 1);
...

However, the call to write got a bit mangled, requiring effort to decode it
back to its original form.

Instead, add a new function gdb::write that allows us to write:
...
  ssize_t ret = gdb::write (pipe[1], "+", 1);
...

Likewise for waitpid, read and close.

Tested on x86_64-linux.

1 files changed, 1 insertions, 1 deletions

diff --git a/gdb/cli/cli-cmds.c b/gdb/cli/cli-cmds.c
index bc6cb58..0140c71 100644
--- a/gdb/cli/cli-cmds.c
+++ b/gdb/cli/cli-cmds.c
@@ -923,7 +923,7 @@ run_under_shell (const char *arg, int from_tty)
 
   if (pid != -1)
     {
-      int ret = gdb::handle_eintr (-1, ::waitpid, pid, &status, 0);
+      int ret = gdb::waitpid (pid, &status, 0);
       if (ret == -1)
 	perror_with_name ("Cannot get status of shell command");
     }