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-rw-r--r--lib/readline/signals.c263
1 files changed, 155 insertions, 108 deletions
diff --git a/lib/readline/signals.c b/lib/readline/signals.c
index e3d93a0..2fe7953 100644
--- a/lib/readline/signals.c
+++ b/lib/readline/signals.c
@@ -21,32 +21,18 @@
675 Mass Ave, Cambridge, MA 02139, USA. */
#define READLINE_LIBRARY
-#include <stdio.h>
+#if defined (HAVE_CONFIG_H)
+# include <config.h>
+#endif
+
+#include <stdio.h> /* Just for NULL. Yuck. */
#include <sys/types.h>
-#include <fcntl.h>
-#if !defined (NO_SYS_FILE)
-# include <sys/file.h>
-#endif /* !NO_SYS_FILE */
#include <signal.h>
#if defined (HAVE_UNISTD_H)
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
-#if defined (HAVE_STDLIB_H)
-# include <stdlib.h>
-#else
-# include "ansi_stdlib.h"
-#endif /* HAVE_STDLIB_H */
-
-#include <errno.h>
-/* Not all systems declare ERRNO in errno.h... and some systems #define it! */
-#if !defined (errno)
-extern int errno;
-#endif /* !errno */
-
-#include "posixstat.h"
-
/* System-specific feature definitions and include files. */
#include "rldefs.h"
@@ -54,6 +40,11 @@ extern int errno;
# include <sys/ioctl.h>
#endif /* GWINSZ_IN_SYS_IOCTL */
+#if defined (__GO32__)
+# undef HANDLE_SIGNALS
+#endif /* __GO32__ */
+
+#if defined (HANDLE_SIGNALS)
/* Some standard library routines. */
#include "readline.h"
#include "history.h"
@@ -63,72 +54,60 @@ extern int rl_pending_input;
extern int _rl_meta_flag;
extern void free_undo_list ();
+extern void _rl_get_screen_size ();
+extern void _rl_redisplay_after_sigwinch ();
+extern void _rl_clean_up_for_exit ();
+extern void _rl_kill_kbd_macro ();
+extern void _rl_init_argument ();
+extern void rl_deprep_terminal (), rl_prep_terminal ();
+
+#if !defined (RETSIGTYPE)
+# if defined (VOID_SIGHANDLER)
+# define RETSIGTYPE void
+# else
+# define RETSIGTYPE int
+# endif /* !VOID_SIGHANDLER */
+#endif /* !RETSIGTYPE */
#if defined (VOID_SIGHANDLER)
-# define sighandler void
+# define SIGHANDLER_RETURN return
#else
-# define sighandler int
-#endif /* VOID_SIGHANDLER */
+# define SIGHANDLER_RETURN return (0)
+#endif
/* This typedef is equivalant to the one for Function; it allows us
to say SigHandler *foo = signal (SIGKILL, SIG_IGN); */
-typedef sighandler SigHandler ();
+typedef RETSIGTYPE SigHandler ();
-#if defined (__GO32__)
-# undef HANDLE_SIGNALS
-#endif /* __GO32__ */
+static SigHandler *rl_set_sighandler ();
-#if defined (STATIC_MALLOC)
-static char *xmalloc (), *xrealloc ();
-#else
-extern char *xmalloc (), *xrealloc ();
-#endif /* STATIC_MALLOC */
-
-
/* **************************************************************** */
/* */
/* Signal Handling */
/* */
/* **************************************************************** */
-#if defined (SIGWINCH)
-static SigHandler *old_sigwinch = (SigHandler *)NULL;
-
-static sighandler
-rl_handle_sigwinch (sig)
- int sig;
-{
- if (readline_echoing_p)
- {
- _rl_set_screen_size (fileno (rl_instream), 1);
- _rl_redisplay_after_sigwinch ();
- }
+#if defined (HAVE_POSIX_SIGNALS)
+typedef struct sigaction sighandler_cxt;
+# define rl_sigaction(s, nh, oh) sigaction(s, nh, oh)
+#else
+typedef struct { SigHandler *sa_handler; } sighandler_cxt;
+# define sigemptyset(m)
+#endif /* !HAVE_POSIX_SIGNALS */
- if (old_sigwinch &&
- old_sigwinch != (SigHandler *)SIG_IGN &&
- old_sigwinch != (SigHandler *)SIG_DFL)
- (*old_sigwinch) (sig);
-#if !defined (VOID_SIGHANDLER)
- return (0);
-#endif /* VOID_SIGHANDLER */
-}
-#endif /* SIGWINCH */
+static sighandler_cxt old_int, old_alrm;
-#if defined (HANDLE_SIGNALS)
-/* Interrupt handling. */
-static SigHandler
- *old_int = (SigHandler *)NULL,
- *old_alrm = (SigHandler *)NULL;
#if !defined (SHELL)
-static SigHandler
- *old_tstp = (SigHandler *)NULL,
- *old_ttou = (SigHandler *)NULL,
- *old_ttin = (SigHandler *)NULL,
- *old_cont = (SigHandler *)NULL;
+static sighandler_cxt old_tstp, old_ttou, old_ttin, old_term;
#endif /* !SHELL */
-/* Handle an interrupt character. */
-static sighandler
+#if defined (SIGWINCH)
+static sighandler_cxt old_winch;
+#endif
+
+/* Readline signal handler functions. */
+
+static RETSIGTYPE
rl_signal_handler (sig)
int sig;
{
@@ -143,9 +122,9 @@ rl_signal_handler (sig)
#if !defined (HAVE_BSD_SIGNALS) && !defined (HAVE_POSIX_SIGNALS)
/* Since the signal will not be blocked while we are in the signal
handler, ignore it until rl_clear_signals resets the catcher. */
- if (sig == SIGINT)
- signal (sig, SIG_IGN);
-#endif /* !HAVE_BSD_SIGNALS */
+ if (sig == SIGINT || sig == SIGALRM)
+ rl_set_sighandler (sig, SIG_IGN, (sighandler_cxt *)NULL);
+#endif /* !HAVE_BSD_SIGNALS && !HAVE_POSIX_SIGNALS */
switch (sig)
{
@@ -161,7 +140,7 @@ rl_signal_handler (sig)
}
_rl_kill_kbd_macro ();
rl_clear_message ();
- rl_init_argument ();
+ _rl_init_argument ();
#if defined (SIGTSTP)
case SIGTSTP:
@@ -169,8 +148,9 @@ rl_signal_handler (sig)
case SIGTTIN:
#endif /* SIGTSTP */
case SIGALRM:
- rl_clean_up_for_exit ();
- rl_deprep_terminal ();
+ case SIGTERM:
+ _rl_clean_up_for_exit ();
+ (*rl_deprep_term_function) ();
rl_clear_signals ();
rl_pending_input = 0;
@@ -194,92 +174,159 @@ rl_signal_handler (sig)
# endif /* HAVE_BSD_SIGNALS */
#endif /* !HAVE_POSIX_SIGNALS */
- rl_prep_terminal (_rl_meta_flag);
+ (*rl_prep_term_function) (_rl_meta_flag);
rl_set_signals ();
}
-#if !defined (VOID_SIGHANDLER)
- return (0);
-#endif /* !VOID_SIGHANDLER */
+ SIGHANDLER_RETURN;
}
-#if defined (HAVE_POSIX_SIGNALS)
+#if defined (SIGWINCH)
+static RETSIGTYPE
+rl_handle_sigwinch (sig)
+ int sig;
+{
+ SigHandler *oh;
+
+ if (readline_echoing_p)
+ {
+ _rl_get_screen_size (fileno (rl_instream), 1);
+ _rl_redisplay_after_sigwinch ();
+ }
+
+ /* If another sigwinch handler has been installed, call it. */
+ oh = (SigHandler *)old_winch.sa_handler;
+ if (oh && oh != (SigHandler *)SIG_IGN && oh != (SigHandler *)SIG_DFL)
+ (*oh) (sig);
+
+ SIGHANDLER_RETURN;
+}
+#endif /* SIGWINCH */
+
+/* Functions to manage signal handling. */
+
+#if !defined (HAVE_POSIX_SIGNALS)
+static int
+rl_sigaction (sig, nh, oh)
+ int sig;
+ sighandler_cxt *nh, *oh;
+{
+ oh->sa_handler = signal (sig, nh->sa_handler);
+ return 0;
+}
+#endif /* !HAVE_POSIX_SIGNALS */
+
+/* Set up a readline-specific signal handler, saving the old signal
+ information in OHANDLER. Return the old signal handler, like
+ signal(). */
static SigHandler *
-rl_set_sighandler (sig, handler)
+rl_set_sighandler (sig, handler, ohandler)
int sig;
SigHandler *handler;
+ sighandler_cxt *ohandler;
{
- struct sigaction act, oact;
+#if defined (HAVE_POSIX_SIGNALS)
+ struct sigaction act;
act.sa_handler = handler;
act.sa_flags = 0;
sigemptyset (&act.sa_mask);
- sigemptyset (&oact.sa_mask);
- sigaction (sig, &act, &oact);
- return (oact.sa_handler);
-}
-
-#else /* !HAVE_POSIX_SIGNALS */
-# define rl_set_sighandler(sig, handler) (SigHandler *)signal (sig, handler)
+ sigemptyset (&ohandler->sa_mask);
+ sigaction (sig, &act, ohandler);
+#else
+ ohandler->sa_handler = (SigHandler *)signal (sig, handler);
#endif /* !HAVE_POSIX_SIGNALS */
+ return (ohandler->sa_handler);
+}
+int
rl_set_signals ()
{
- old_int = (SigHandler *)rl_set_sighandler (SIGINT, rl_signal_handler);
- if (old_int == (SigHandler *)SIG_IGN)
- rl_set_sighandler (SIGINT, SIG_IGN);
+ sighandler_cxt dummy;
+ SigHandler *oh;
+
+#if defined (HAVE_POSIX_SIGNALS)
+ sigemptyset (&dummy.sa_mask);
+#endif
- old_alrm = (SigHandler *)rl_set_sighandler (SIGALRM, rl_signal_handler);
- if (old_alrm == (SigHandler *)SIG_IGN)
- rl_set_sighandler (SIGALRM, SIG_IGN);
+ oh = rl_set_sighandler (SIGINT, rl_signal_handler, &old_int);
+ if (oh == (SigHandler *)SIG_IGN)
+ rl_sigaction (SIGINT, &old_int, &dummy);
+
+ oh = rl_set_sighandler (SIGALRM, rl_signal_handler, &old_alrm);
+ if (oh == (SigHandler *)SIG_IGN)
+ rl_sigaction (SIGALRM, &old_alrm, &dummy);
+#if defined (HAVE_POSIX_SIGNALS) && defined (SA_RESTART)
+ /* If the application using readline has already installed a signal
+ handler with SA_RESTART, SIGALRM will cause reads to be restarted
+ automatically, so readline should just get out of the way. Since
+ we tested for SIG_IGN above, we can just test for SIG_DFL here. */
+ if (oh != (SigHandler *)SIG_DFL && (old_alrm.sa_flags & SA_RESTART))
+ rl_sigaction (SIGALRM, &old_alrm, &dummy);
+#endif /* HAVE_POSIX_SIGNALS */
#if !defined (SHELL)
#if defined (SIGTSTP)
- old_tstp = (SigHandler *)rl_set_sighandler (SIGTSTP, rl_signal_handler);
- if (old_tstp == (SigHandler *)SIG_IGN)
- rl_set_sighandler (SIGTSTP, SIG_IGN);
+ oh = rl_set_sighandler (SIGTSTP, rl_signal_handler, &old_tstp);
+ if (oh == (SigHandler *)SIG_IGN)
+ rl_sigaction (SIGTSTP, &old_tstp, &dummy);
+#else
+ oh = (SigHandler *)NULL;
#endif /* SIGTSTP */
+
#if defined (SIGTTOU)
- old_ttou = (SigHandler *)rl_set_sighandler (SIGTTOU, rl_signal_handler);
- old_ttin = (SigHandler *)rl_set_sighandler (SIGTTIN, rl_signal_handler);
+ rl_set_sighandler (SIGTTOU, rl_signal_handler, &old_ttou);
+ rl_set_sighandler (SIGTTIN, rl_signal_handler, &old_ttin);
- if (old_tstp == (SigHandler *)SIG_IGN)
+ if (oh == (SigHandler *)SIG_IGN)
{
- rl_set_sighandler (SIGTTOU, SIG_IGN);
- rl_set_sighandler (SIGTTIN, SIG_IGN);
+ rl_set_sighandler (SIGTTOU, SIG_IGN, &dummy);
+ rl_set_sighandler (SIGTTIN, SIG_IGN, &dummy);
}
#endif /* SIGTTOU */
+ /* Handle SIGTERM if we're not being compiled as part of bash. */
+ rl_set_sighandler (SIGTERM, rl_signal_handler, &old_term);
#endif /* !SHELL */
#if defined (SIGWINCH)
- old_sigwinch =
- (SigHandler *) rl_set_sighandler (SIGWINCH, rl_handle_sigwinch);
+ rl_set_sighandler (SIGWINCH, rl_handle_sigwinch, &old_winch);
#endif /* SIGWINCH */
+
return 0;
}
+int
rl_clear_signals ()
{
- rl_set_sighandler (SIGINT, old_int);
- rl_set_sighandler (SIGALRM, old_alrm);
+ sighandler_cxt dummy;
+
+#if defined (HAVE_POSIX_SIGNALS)
+ sigemptyset (&dummy.sa_mask);
+#endif
+
+ rl_sigaction (SIGINT, &old_int, &dummy);
+ rl_sigaction (SIGALRM, &old_alrm, &dummy);
#if !defined (SHELL)
#if defined (SIGTSTP)
- rl_set_sighandler (SIGTSTP, old_tstp);
+ rl_sigaction (SIGTSTP, &old_tstp, &dummy);
#endif
#if defined (SIGTTOU)
- rl_set_sighandler (SIGTTOU, old_ttou);
- rl_set_sighandler (SIGTTIN, old_ttin);
+ rl_sigaction (SIGTTOU, &old_ttou, &dummy);
+ rl_sigaction (SIGTTIN, &old_ttin, &dummy);
#endif /* SIGTTOU */
+ rl_sigaction (SIGTERM, &old_term, &dummy);
+
#endif /* !SHELL */
#if defined (SIGWINCH)
- rl_set_sighandler (SIGWINCH, old_sigwinch);
+ sigemptyset (&dummy.sa_mask);
+ rl_sigaction (SIGWINCH, &old_winch, &dummy);
#endif
return 0;
generated by cgit v1.2.3 (git 2.25.1) at 2025-06-17 03:57:23 +0000