6f98576f29
In some scenarios, GDB or GDBserver can be spawned with input _not_ connected to a tty, and then tests that rely on stdio fail with timeouts, because the inferior's stdout and stderr streams end up fully buffered. See discussion here: https://sourceware.org/ml/gdb-patches/2015-02/msg00809.html We have a hack in place that works around this for Windows testing, that forces every test program to link with an .o file that does (lib/set_unbuffered_mode.c): static int __gdb_set_unbuffered_output (void) __attribute__ ((constructor)); static int __gdb_set_unbuffered_output (void) { setvbuf (stdout, NULL, _IONBF, BUFSIZ); setvbuf (stderr, NULL, _IONBF, BUFSIZ); } That's a bit hacky; it ends up done for _all_ tests. This patch adds a way to do this unbuffering explicitly from the test code itself, so it is done only when necessary, and for all targets/hosts. For starters, it adjusts gdb.base/interrupt.c to use it. Tested on x86_64 Fedora 20, native, and against a remote gdbserver board file that connects to the target with ssh, with and without -t (create pty). gdb/testsuite/ 2015-02-27 Pedro Alves <palves@redhat.com> * lib/unbuffer_output.c: New file. * gdb.base/interrupt.c: Include "../lib/unbuffer_output.c". (main): Call gdb_unbuffer_output.
57 lines
686 B
C
57 lines
686 B
C
#include <errno.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include "../lib/unbuffer_output.c"
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#ifdef SIGNALS
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#include <signal.h>
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static void
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sigint_handler (int signo)
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{
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}
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#endif
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int
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main ()
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{
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char x;
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int nbytes;
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gdb_unbuffer_output ();
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#ifdef SIGNALS
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signal (SIGINT, sigint_handler);
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#endif
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printf ("talk to me baby\n");
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while (1)
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{
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nbytes = read (0, &x, 1);
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if (nbytes < 0)
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{
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#ifdef EINTR
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if (errno != EINTR)
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#endif
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{
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perror ("");
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return 1;
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}
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}
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else if (nbytes == 0)
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{
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printf ("end of file\n");
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exit (0);
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}
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else
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write (1, &x, 1);
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}
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return 0;
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}
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int
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func1 ()
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{
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return 4;
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}
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