diff options
Diffstat (limited to 'readline/input.c')
| -rw-r--r-- | readline/input.c | 115 |
1 files changed, 92 insertions, 23 deletions
diff --git a/readline/input.c b/readline/input.c index c00bce77a74..077d53c2b6a 100644 --- a/readline/input.c +++ b/readline/input.c @@ -1,6 +1,6 @@ /* input.c -- character input functions for readline. */ -/* Copyright (C) 1994-2010 Free Software Foundation, Inc. +/* Copyright (C) 1994-2015 Free Software Foundation, Inc. This file is part of the GNU Readline Library (Readline), a library for reading lines of text with interactive input and history editing. @@ -45,6 +45,8 @@ # include "ansi_stdlib.h" #endif /* HAVE_STDLIB_H */ +#include <signal.h> + #include "posixselect.h" #if defined (FIONREAD_IN_SYS_IOCTL) @@ -78,6 +80,13 @@ extern int errno; character input. */ rl_hook_func_t *rl_event_hook = (rl_hook_func_t *)NULL; +/* A function to call if a read(2) is interrupted by a signal. */ +rl_hook_func_t *rl_signal_event_hook = (rl_hook_func_t *)NULL; + +/* A function to replace _rl_input_available for applications using the + callback interface. */ +rl_hook_func_t *rl_input_available_hook = (rl_hook_func_t *)NULL; + rl_getc_func_t *rl_getc_function = rl_getc; static int _keyboard_input_timeout = 100000; /* 0.1 seconds; it's in usec */ @@ -135,6 +144,12 @@ _rl_any_typein () return any_typein; } +int +_rl_pushed_input_available () +{ + return (push_index != pop_index); +} + /* Return the amount of space available in the buffer for stuffing characters. */ static int @@ -148,7 +163,7 @@ ibuffer_space () /* Get a key from the buffer of characters to be read. Return the key in KEY. - Result is KEY if there was a key, or 0 if there wasn't. */ + Result is non-zero if there was a key, or 0 if there wasn't. */ static int rl_get_char (key) int *key; @@ -185,12 +200,6 @@ _rl_unget_char (key) return (0); } -int -_rl_pushed_input_available () -{ - return (push_index != pop_index); -} - /* If a character is available to be read, then read it and stuff it into IBUFFER. Otherwise, just return. Returns number of characters read (0 if none available) and -1 on error (EIO). */ @@ -207,6 +216,7 @@ rl_gather_tyi () #endif chars_avail = 0; + input = 0; tty = fileno (rl_instream); #if defined (HAVE_SELECT) @@ -221,11 +231,13 @@ rl_gather_tyi () #endif result = -1; -#if defined (FIONREAD) errno = 0; +#if defined (FIONREAD) result = ioctl (tty, FIONREAD, &chars_avail); if (result == -1 && errno == EIO) return -1; + if (result == -1) + chars_avail = 0; #endif #if defined (O_NDELAY) @@ -239,6 +251,8 @@ rl_gather_tyi () fcntl (tty, F_SETFL, tem); if (chars_avail == -1 && errno == EAGAIN) return 0; + if (chars_avail == -1 && errno == EIO) + return -1; if (chars_avail == 0) /* EOF */ { rl_stuff_char (EOF); @@ -322,6 +336,9 @@ _rl_input_available () #endif int tty; + if (rl_input_available_hook) + return (*rl_input_available_hook) (); + tty = fileno (rl_instream); #if defined (HAVE_SELECT) @@ -440,9 +457,7 @@ rl_clear_pending_input () int rl_read_key () { - int c; - - rl_key_sequence_length++; + int c, r; if (rl_pending_input) { @@ -460,14 +475,18 @@ rl_read_key () { while (rl_event_hook) { - if (rl_gather_tyi () < 0) /* XXX - EIO */ + if (rl_get_char (&c) != 0) + break; + + if ((r = rl_gather_tyi ()) < 0) /* XXX - EIO */ { rl_done = 1; - return ('\n'); + return (errno == EIO ? (RL_ISSTATE (RL_STATE_READCMD) ? READERR : EOF) : '\n'); } + else if (r > 0) /* read something */ + continue; + RL_CHECK_SIGNALS (); - if (rl_get_char (&c) != 0) - break; if (rl_done) /* XXX - experimental */ return ('\n'); (*rl_event_hook) (); @@ -477,6 +496,7 @@ rl_read_key () { if (rl_get_char (&c) == 0) c = (*rl_getc_function) (rl_instream); +/* fprintf(stderr, "rl_read_key: calling RL_CHECK_SIGNALS: _rl_caught_signal = %d", _rl_caught_signal); */ RL_CHECK_SIGNALS (); } } @@ -490,18 +510,31 @@ rl_getc (stream) { int result; unsigned char c; +#if defined (HAVE_PSELECT) + sigset_t empty_set; + fd_set readfds; +#endif while (1) { RL_CHECK_SIGNALS (); + /* We know at this point that _rl_caught_signal == 0 */ + #if defined (__MINGW32__) - /* Use _getch to make sure we call the function from MS runtime, - even if some curses library is linked in. */ if (isatty (fileno (stream))) - return (_getch ()); + return (_getch ()); /* "There is no error return." */ +#endif + result = 0; +#if defined (HAVE_PSELECT) + sigemptyset (&empty_set); + sigprocmask (SIG_BLOCK, (sigset_t *)NULL, &empty_set); + FD_ZERO (&readfds); + FD_SET (fileno (stream), &readfds); + result = pselect (fileno (stream) + 1, &readfds, NULL, NULL, NULL, &empty_set); #endif - result = read (fileno (stream), &c, sizeof (unsigned char)); + if (result >= 0) + result = read (fileno (stream), &c, sizeof (unsigned char)); if (result == sizeof (unsigned char)) return (c); @@ -538,11 +571,47 @@ rl_getc (stream) #undef X_EWOULDBLOCK #undef X_EAGAIN - /* If the error that we received was SIGINT, then try again, - this is simply an interrupted system call to read (). - Otherwise, some error ocurred, also signifying EOF. */ +/* fprintf(stderr, "rl_getc: result = %d errno = %d\n", result, errno); */ + +handle_error: + /* If the error that we received was EINTR, then try again, + this is simply an interrupted system call to read (). We allow + the read to be interrupted if we caught SIGHUP, SIGTERM, or any + of the other signals readline treats specially. If the + application sets an event hook, call it for other signals. + Otherwise (not EINTR), some error occurred, also signifying EOF. */ if (errno != EINTR) return (RL_ISSTATE (RL_STATE_READCMD) ? READERR : EOF); + /* fatal signals of interest */ +#if defined (SIGHUP) + else if (_rl_caught_signal == SIGHUP || _rl_caught_signal == SIGTERM) +#else + else if (_rl_caught_signal == SIGTERM) +#endif + return (RL_ISSTATE (RL_STATE_READCMD) ? READERR : EOF); + /* keyboard-generated signals of interest */ +#if defined (SIGQUIT) + else if (_rl_caught_signal == SIGINT || _rl_caught_signal == SIGQUIT) +#else + else if (_rl_caught_signal == SIGINT) +#endif + RL_CHECK_SIGNALS (); + /* non-keyboard-generated signals of interest */ +#if defined (SIGWINCH) + else if (_rl_caught_signal == SIGWINCH) + RL_CHECK_SIGNALS (); +#endif /* SIGWINCH */ +#if defined (SIGALRM) + else if (_rl_caught_signal == SIGALRM +# if defined (SIGVTALRM) + || _rl_caught_signal == SIGVTALRM +# endif + ) + RL_CHECK_SIGNALS (); +#endif /* SIGALRM */ + + if (rl_signal_event_hook) + (*rl_signal_event_hook) (); } } |