Check the return value of libc's functions to make `_FORTIFY_SOURCE=2' work.

This fixes bug #24009 reported by Martin Pitt.

* libguile/threads.c (guilify_self_1): Check the return value of
  pipe(2).
  (scm_std_select): Use `full_read ()' instead of `read ()' when reading
  from WAKEUP_FD.

* libguile/async.c (scm_i_queue_async_cell): Use `full_write ()' instead
  of write(2) when writing to SLEEP_FD.

* libguile/fports.c (fport_flush): Likewise.

* libguile/posix.c (getgroups): Use the return value of getgroups(2) as
  NGROUPS.
  (scm_nice): Get the return value of nice(2) to make glibc happy.

* libguile/scmsigs.c (take_signal): Use `full_write ()' instead of
  write(2).

1 files changed, 4 insertions, 1 deletions

diff --git a/libguile/scmsigs.c b/libguile/scmsigs.c
index 237bc5323..eb7cec67b 100644
--- a/libguile/scmsigs.c
+++ b/libguile/scmsigs.c
@@ -63,6 +63,9 @@
 #define pipe(fd) _pipe (fd, 256, O_BINARY)
 #endif
 
+#include <full-write.h>
+
+
 
 
 /* SIGRETTYPE is the type that signal handlers return.  See <signal.h> */
@@ -137,7 +140,7 @@ static SIGRETTYPE
 take_signal (int signum)
 {
   char sigbyte = signum;
-  write (signal_pipe[1], &sigbyte, 1);
+  full_write (signal_pipe[1], &sigbyte, 1);
 
 #ifndef HAVE_SIGACTION
   signal (signum, take_signal);