mirror of
https://github.com/rkd77/elinks.git
synced 2024-12-04 14:46:47 -05:00
a69ef92723
this assertion is excluded on that platform
342 lines
6.5 KiB
C
342 lines
6.5 KiB
C
/* File descriptors managment and switching */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <errno.h>
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#include <signal.h>
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#include <string.h> /* FreeBSD FD_ZERO() macro calls bzero() */
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#ifdef HAVE_SYS_SIGNAL_H
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#include <sys/signal.h>
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#endif
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#include <sys/types.h>
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#ifdef HAVE_SYS_WAIT_H
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#include <sys/wait.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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/* This must be here, thanks to BSD. */
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#ifdef HAVE_INTTYPES_H
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#include <inttypes.h> /* OMG */
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#endif
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#ifdef HAVE_SYS_SELECT_H
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#include <sys/select.h>
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#endif
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#include "elinks.h"
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#include "intl/gettext/libintl.h"
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#include "main/main.h"
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#include "main/select.h"
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#include "main/timer.h"
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#include "osdep/signals.h"
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#include "terminal/terminal.h"
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#include "util/error.h"
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#include "util/memory.h"
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#include "util/time.h"
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#ifndef FD_SETSIZE
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#define FD_SETSIZE 1024
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#endif
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struct thread {
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select_handler_T read_func;
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select_handler_T write_func;
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select_handler_T error_func;
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void *data;
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};
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static struct thread threads[FD_SETSIZE];
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static fd_set w_read;
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static fd_set w_write;
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static fd_set w_error;
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static fd_set x_read;
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static fd_set x_write;
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static fd_set x_error;
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static int w_max;
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int
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get_file_handles_count(void)
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{
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int i = 0, j;
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for (j = 0; j < FD_SETSIZE; j++)
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if (threads[j].read_func
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|| threads[j].write_func
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|| threads[j].error_func)
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i++;
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return i;
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}
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struct bottom_half {
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LIST_HEAD(struct bottom_half);
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select_handler_T fn;
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void *data;
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};
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static INIT_LIST_HEAD(bottom_halves);
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int
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register_bottom_half_do(select_handler_T fn, void *data)
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{
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struct bottom_half *bh;
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foreach (bh, bottom_halves)
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if (bh->fn == fn && bh->data == data)
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return 0;
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bh = mem_alloc(sizeof(*bh));
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if (!bh) return -1;
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bh->fn = fn;
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bh->data = data;
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add_to_list(bottom_halves, bh);
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return 0;
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}
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void
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check_bottom_halves(void)
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{
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while (!list_empty(bottom_halves)) {
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struct bottom_half *bh = bottom_halves.prev;
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select_handler_T fn = bh->fn;
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void *data = bh->data;
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del_from_list(bh);
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mem_free(bh);
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fn(data);
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}
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}
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select_handler_T
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get_handler(int fd, enum select_handler_type tp)
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{
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#ifndef CONFIG_OS_WIN32
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assertm(fd >= 0 && fd < FD_SETSIZE,
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"get_handler: handle %d >= FD_SETSIZE %d",
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fd, FD_SETSIZE);
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if_assert_failed return NULL;
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#endif
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switch (tp) {
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case SELECT_HANDLER_READ: return threads[fd].read_func;
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case SELECT_HANDLER_WRITE: return threads[fd].write_func;
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case SELECT_HANDLER_ERROR: return threads[fd].error_func;
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case SELECT_HANDLER_DATA: return threads[fd].data;
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}
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INTERNAL("get_handler: bad type %d", tp);
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return NULL;
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}
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void
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set_handlers(int fd, select_handler_T read_func, select_handler_T write_func,
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select_handler_T error_func, void *data)
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{
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#ifndef CONFIG_OS_WIN32
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assertm(fd >= 0 && fd < FD_SETSIZE,
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"set_handlers: handle %d >= FD_SETSIZE %d",
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fd, FD_SETSIZE);
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if_assert_failed return;
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#endif
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threads[fd].read_func = read_func;
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threads[fd].write_func = write_func;
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threads[fd].error_func = error_func;
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threads[fd].data = data;
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if (read_func) {
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FD_SET(fd, &w_read);
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} else {
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FD_CLR(fd, &w_read);
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FD_CLR(fd, &x_read);
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}
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if (write_func) {
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FD_SET(fd, &w_write);
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} else {
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FD_CLR(fd, &w_write);
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FD_CLR(fd, &x_write);
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}
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if (error_func) {
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FD_SET(fd, &w_error);
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} else {
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FD_CLR(fd, &w_error);
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FD_CLR(fd, &x_error);
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}
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if (read_func || write_func || error_func) {
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if (fd >= w_max) w_max = fd + 1;
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} else if (fd == w_max - 1) {
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int i;
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for (i = fd - 1; i >= 0; i--)
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if (FD_ISSET(i, &w_read)
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|| FD_ISSET(i, &w_write)
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|| FD_ISSET(i, &w_error))
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break;
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w_max = i + 1;
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}
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}
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void
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select_loop(void (*init)(void))
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{
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timeval_T last_time;
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int select_errors = 0;
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clear_signal_mask_and_handlers();
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FD_ZERO(&w_read);
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FD_ZERO(&w_write);
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FD_ZERO(&w_error);
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w_max = 0;
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timeval_now(&last_time);
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#ifdef SIGPIPE
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signal(SIGPIPE, SIG_IGN);
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#endif
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init();
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check_bottom_halves();
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while (!program.terminate) {
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struct timeval *timeout = NULL;
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int n, i, has_timer;
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timeval_T t;
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check_signals();
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check_timers(&last_time);
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redraw_all_terminals();
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memcpy(&x_read, &w_read, sizeof(fd_set));
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memcpy(&x_write, &w_write, sizeof(fd_set));
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memcpy(&x_error, &w_error, sizeof(fd_set));
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if (program.terminate) break;
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has_timer = get_next_timer_time(&t);
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if (!w_max && !has_timer) break;
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critical_section = 1;
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if (check_signals()) {
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critical_section = 0;
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continue;
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}
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#if 0
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{
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int i;
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printf("\nR:");
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for (i = 0; i < 256; i++)
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if (FD_ISSET(i, &x_read)) printf("%d,", i);
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printf("\nW:");
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for (i = 0; i < 256; i++)
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if (FD_ISSET(i, &x_write)) printf("%d,", i);
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printf("\nE:");
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for (i = 0; i < 256; i++)
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if (FD_ISSET(i, &x_error)) printf("%d,", i);
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fflush(stdout);
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}
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#endif
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if (has_timer) {
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/* Be sure timeout is not negative. */
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timeval_limit_to_zero_or_one(&t);
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timeout = (struct timeval *) &t;
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}
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n = select(w_max, &x_read, &x_write, &x_error, timeout);
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if (n < 0) {
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critical_section = 0;
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uninstall_alarm();
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if (errno != EINTR) {
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ERROR(gettext("The call to %s failed: %d (%s)"),
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"select()", errno, (unsigned char *) strerror(errno));
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if (++select_errors > 10) /* Infinite loop prevention. */
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INTERNAL(gettext("%d select() failures."),
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select_errors);
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}
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continue;
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}
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select_errors = 0;
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critical_section = 0;
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uninstall_alarm();
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check_signals();
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/*printf("sel: %d\n", n);*/
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check_timers(&last_time);
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i = -1;
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while (n > 0 && ++i < w_max) {
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int k = 0;
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#if 0
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printf("C %d : %d,%d,%d\n", i, FD_ISSET(i, &w_read),
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FD_ISSET(i, &w_write), FD_ISSET(i, &w_error));
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printf("A %d : %d,%d,%d\n", i, FD_ISSET(i, &x_read),
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FD_ISSET(i, &x_write), FD_ISSET(i, &x_error));
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#endif
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if (FD_ISSET(i, &x_read)) {
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if (threads[i].read_func) {
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threads[i].read_func(threads[i].data);
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check_bottom_halves();
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}
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k = 1;
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}
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if (FD_ISSET(i, &x_write)) {
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if (threads[i].write_func) {
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threads[i].write_func(threads[i].data);
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check_bottom_halves();
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}
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k = 1;
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}
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if (FD_ISSET(i, &x_error)) {
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if (threads[i].error_func) {
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threads[i].error_func(threads[i].data);
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check_bottom_halves();
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}
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k = 1;
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}
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n -= k;
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}
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}
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}
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static int
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can_read_or_write(int fd, int write)
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{
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struct timeval tv = {0, 0};
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fd_set fds;
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fd_set *rfds = NULL;
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fd_set *wfds = NULL;
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FD_ZERO(&fds);
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FD_SET(fd, &fds);
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if (write)
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wfds = &fds;
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else
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rfds = &fds;
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return select(fd + 1, rfds, wfds, NULL, &tv);
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}
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int
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can_read(int fd)
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{
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return can_read_or_write(fd, 0);
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}
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int
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can_write(int fd)
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{
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return can_read_or_write(fd, 1);
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}
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