diff options
Diffstat (limited to 'gdb/utils.c')
| -rw-r--r-- | gdb/utils.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/gdb/utils.c b/gdb/utils.c index 99b0e76..4396d14 100644 --- a/gdb/utils.c +++ b/gdb/utils.c @@ -67,6 +67,8 @@ #include <sys/time.h> #include <time.h> +#include "gdb_usleep.h" + #if !HAVE_DECL_MALLOC extern PTR malloc (); /* ARI: PTR */ #endif @@ -1477,6 +1479,25 @@ defaulted_query (const char *ctlstr, const char defchar, va_list args) gdb_flush (gdb_stdout); answer = fgetc (stdin); + + /* We expect fgetc to block until a character is read. But + this may not be the case if the terminal was opened with + the NONBLOCK flag. In that case, if there is nothing to + read on stdin, fgetc returns EOF, but also sets the error + condition flag on stdin and errno to EAGAIN. With a true + EOF, stdin's error condition flag is not set. + + A situation where this behavior was observed is a pseudo + terminal on AIX. */ + while (answer == EOF && ferror (stdin) && errno == EAGAIN) + { + /* Not a real EOF. Wait a little while and try again until + we read something. */ + clearerr (stdin); + gdb_usleep (10000); + answer = fgetc (stdin); + } + clearerr (stdin); /* in case of C-d */ if (answer == EOF) /* C-d */ { |