Jeff Dike | 63ae2a9 | 2006-03-27 01:14:30 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com) |
| 3 | * Licensed under the GPL |
| 4 | */ |
| 5 | |
| 6 | #include <stdlib.h> |
| 7 | #include <unistd.h> |
| 8 | #include <errno.h> |
| 9 | #include <signal.h> |
| 10 | #include <string.h> |
| 11 | #include <sys/poll.h> |
| 12 | #include <sys/types.h> |
| 13 | #include <sys/time.h> |
| 14 | #include "user_util.h" |
| 15 | #include "kern_util.h" |
| 16 | #include "user.h" |
| 17 | #include "process.h" |
| 18 | #include "sigio.h" |
| 19 | #include "irq_user.h" |
| 20 | #include "os.h" |
| 21 | |
| 22 | static struct pollfd *pollfds = NULL; |
| 23 | static int pollfds_num = 0; |
| 24 | static int pollfds_size = 0; |
| 25 | |
| 26 | int os_waiting_for_events(struct irq_fd *active_fds) |
| 27 | { |
| 28 | struct irq_fd *irq_fd; |
| 29 | int i, n, err; |
| 30 | |
| 31 | n = poll(pollfds, pollfds_num, 0); |
| 32 | if(n < 0){ |
| 33 | err = -errno; |
| 34 | if(errno != EINTR) |
| 35 | printk("sigio_handler: os_waiting_for_events:" |
| 36 | " poll returned %d, errno = %d\n", n, errno); |
| 37 | return err; |
| 38 | } |
| 39 | |
| 40 | if(n == 0) |
| 41 | return 0; |
| 42 | |
| 43 | irq_fd = active_fds; |
| 44 | |
| 45 | for(i = 0; i < pollfds_num; i++){ |
| 46 | if(pollfds[i].revents != 0){ |
| 47 | irq_fd->current_events = pollfds[i].revents; |
| 48 | pollfds[i].fd = -1; |
| 49 | } |
| 50 | irq_fd = irq_fd->next; |
| 51 | } |
| 52 | return n; |
| 53 | } |
| 54 | |
| 55 | int os_isatty(int fd) |
| 56 | { |
| 57 | return(isatty(fd)); |
| 58 | } |
| 59 | |
| 60 | int os_create_pollfd(int fd, int events, void *tmp_pfd, int size_tmpfds) |
| 61 | { |
| 62 | if (pollfds_num == pollfds_size) { |
| 63 | if (size_tmpfds <= pollfds_size * sizeof(pollfds[0])) { |
| 64 | /* return min size needed for new pollfds area */ |
| 65 | return((pollfds_size + 1) * sizeof(pollfds[0])); |
| 66 | } |
| 67 | |
| 68 | if(pollfds != NULL){ |
| 69 | memcpy(tmp_pfd, pollfds, |
| 70 | sizeof(pollfds[0]) * pollfds_size); |
| 71 | /* remove old pollfds */ |
| 72 | kfree(pollfds); |
| 73 | } |
| 74 | pollfds = tmp_pfd; |
| 75 | pollfds_size++; |
| 76 | } else { |
| 77 | /* remove not used tmp_pfd */ |
| 78 | if (tmp_pfd != NULL) |
| 79 | kfree(tmp_pfd); |
| 80 | } |
| 81 | |
| 82 | pollfds[pollfds_num] = ((struct pollfd) { .fd = fd, |
| 83 | .events = events, |
| 84 | .revents = 0 }); |
| 85 | pollfds_num++; |
| 86 | |
| 87 | return(0); |
| 88 | } |
| 89 | |
| 90 | void os_free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg, |
| 91 | struct irq_fd *active_fds, struct irq_fd ***last_irq_ptr2) |
| 92 | { |
| 93 | struct irq_fd **prev; |
| 94 | int i = 0; |
| 95 | |
| 96 | prev = &active_fds; |
| 97 | while(*prev != NULL){ |
| 98 | if((*test)(*prev, arg)){ |
| 99 | struct irq_fd *old_fd = *prev; |
| 100 | if((pollfds[i].fd != -1) && |
| 101 | (pollfds[i].fd != (*prev)->fd)){ |
| 102 | printk("os_free_irq_by_cb - mismatch between " |
| 103 | "active_fds and pollfds, fd %d vs %d\n", |
| 104 | (*prev)->fd, pollfds[i].fd); |
| 105 | goto out; |
| 106 | } |
| 107 | |
| 108 | pollfds_num--; |
| 109 | |
| 110 | /* This moves the *whole* array after pollfds[i] |
| 111 | * (though it doesn't spot as such)! |
| 112 | */ |
| 113 | |
| 114 | memmove(&pollfds[i], &pollfds[i + 1], |
| 115 | (pollfds_num - i) * sizeof(pollfds[0])); |
| 116 | if(*last_irq_ptr2 == &old_fd->next) |
| 117 | *last_irq_ptr2 = prev; |
| 118 | |
| 119 | *prev = (*prev)->next; |
| 120 | if(old_fd->type == IRQ_WRITE) |
| 121 | ignore_sigio_fd(old_fd->fd); |
| 122 | kfree(old_fd); |
| 123 | continue; |
| 124 | } |
| 125 | prev = &(*prev)->next; |
| 126 | i++; |
| 127 | } |
| 128 | out: |
| 129 | return; |
| 130 | } |
| 131 | |
| 132 | |
| 133 | int os_get_pollfd(int i) |
| 134 | { |
| 135 | return(pollfds[i].fd); |
| 136 | } |
| 137 | |
| 138 | void os_set_pollfd(int i, int fd) |
| 139 | { |
| 140 | pollfds[i].fd = fd; |
| 141 | } |
| 142 | |
| 143 | void os_set_ioignore(void) |
| 144 | { |
| 145 | set_handler(SIGIO, SIG_IGN, 0, -1); |
| 146 | } |
| 147 | |
| 148 | void init_irq_signals(int on_sigstack) |
| 149 | { |
| 150 | __sighandler_t h; |
| 151 | int flags; |
| 152 | |
| 153 | flags = on_sigstack ? SA_ONSTACK : 0; |
| 154 | if(timer_irq_inited) h = (__sighandler_t) alarm_handler; |
| 155 | else h = boot_timer_handler; |
| 156 | |
| 157 | set_handler(SIGVTALRM, h, flags | SA_RESTART, |
| 158 | SIGUSR1, SIGIO, SIGWINCH, SIGALRM, -1); |
| 159 | set_handler(SIGIO, (__sighandler_t) sig_handler, flags | SA_RESTART, |
| 160 | SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1); |
| 161 | signal(SIGWINCH, SIG_IGN); |
| 162 | } |