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1/*
2 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
4 */
5
6#include <stdlib.h>
7#include <errno.h>
8#include <poll.h>
9#include <signal.h>
10#include <string.h>
11#include "irq_user.h"
12#include "os.h"
13#include "um_malloc.h"
14
15/*
16 * Locked by irq_lock in arch/um/kernel/irq.c. Changed by os_create_pollfd
17 * and os_free_irq_by_cb, which are called under irq_lock.
18 */
19static struct pollfd *pollfds = NULL;
20static int pollfds_num = 0;
21static int pollfds_size = 0;
22
23int os_waiting_for_events(struct irq_fd *active_fds)
24{
25 struct irq_fd *irq_fd;
26 int i, n, err;
27
28 n = poll(pollfds, pollfds_num, 0);
29 if (n < 0) {
30 err = -errno;
31 if (errno != EINTR)
32 printk(UM_KERN_ERR "os_waiting_for_events:"
33 " poll returned %d, errno = %d\n", n, errno);
34 return err;
35 }
36
37 if (n == 0)
38 return 0;
39
40 irq_fd = active_fds;
41
42 for (i = 0; i < pollfds_num; i++) {
43 if (pollfds[i].revents != 0) {
44 irq_fd->current_events = pollfds[i].revents;
45 pollfds[i].fd = -1;
46 }
47 irq_fd = irq_fd->next;
48 }
49 return n;
50}
51
52int os_create_pollfd(int fd, int events, void *tmp_pfd, int size_tmpfds)
53{
54 if (pollfds_num == pollfds_size) {
55 if (size_tmpfds <= pollfds_size * sizeof(pollfds[0])) {
56 /* return min size needed for new pollfds area */
57 return (pollfds_size + 1) * sizeof(pollfds[0]);
58 }
59
60 if (pollfds != NULL) {
61 memcpy(tmp_pfd, pollfds,
62 sizeof(pollfds[0]) * pollfds_size);
63 /* remove old pollfds */
64 kfree(pollfds);
65 }
66 pollfds = tmp_pfd;
67 pollfds_size++;
68 } else
69 kfree(tmp_pfd); /* remove not used tmp_pfd */
70
71 pollfds[pollfds_num] = ((struct pollfd) { .fd = fd,
72 .events = events,
73 .revents = 0 });
74 pollfds_num++;
75
76 return 0;
77}
78
79void os_free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg,
80 struct irq_fd *active_fds, struct irq_fd ***last_irq_ptr2)
81{
82 struct irq_fd **prev;
83 int i = 0;
84
85 prev = &active_fds;
86 while (*prev != NULL) {
87 if ((*test)(*prev, arg)) {
88 struct irq_fd *old_fd = *prev;
89 if ((pollfds[i].fd != -1) &&
90 (pollfds[i].fd != (*prev)->fd)) {
91 printk(UM_KERN_ERR "os_free_irq_by_cb - "
92 "mismatch between active_fds and "
93 "pollfds, fd %d vs %d\n",
94 (*prev)->fd, pollfds[i].fd);
95 goto out;
96 }
97
98 pollfds_num--;
99
100 /*
101 * This moves the *whole* array after pollfds[i]
102 * (though it doesn't spot as such)!
103 */
104 memmove(&pollfds[i], &pollfds[i + 1],
105 (pollfds_num - i) * sizeof(pollfds[0]));
106 if (*last_irq_ptr2 == &old_fd->next)
107 *last_irq_ptr2 = prev;
108
109 *prev = (*prev)->next;
110 if (old_fd->type == IRQ_WRITE)
111 ignore_sigio_fd(old_fd->fd);
112 kfree(old_fd);
113 continue;
114 }
115 prev = &(*prev)->next;
116 i++;
117 }
118 out:
119 return;
120}
121
122int os_get_pollfd(int i)
123{
124 return pollfds[i].fd;
125}
126
127void os_set_pollfd(int i, int fd)
128{
129 pollfds[i].fd = fd;
130}
131
132void os_set_ioignore(void)
133{
134 signal(SIGIO, SIG_IGN);
135}
1/*
2 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
4 */
5
6#include <stdlib.h>
7#include <errno.h>
8#include <poll.h>
9#include <signal.h>
10#include <string.h>
11#include "irq_user.h"
12#include "kern_constants.h"
13#include "os.h"
14#include "process.h"
15#include "um_malloc.h"
16#include "user.h"
17
18/*
19 * Locked by irq_lock in arch/um/kernel/irq.c. Changed by os_create_pollfd
20 * and os_free_irq_by_cb, which are called under irq_lock.
21 */
22static struct pollfd *pollfds = NULL;
23static int pollfds_num = 0;
24static int pollfds_size = 0;
25
26int 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(UM_KERN_ERR "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
55int os_create_pollfd(int fd, int events, void *tmp_pfd, int size_tmpfds)
56{
57 if (pollfds_num == pollfds_size) {
58 if (size_tmpfds <= pollfds_size * sizeof(pollfds[0])) {
59 /* return min size needed for new pollfds area */
60 return (pollfds_size + 1) * sizeof(pollfds[0]);
61 }
62
63 if (pollfds != NULL) {
64 memcpy(tmp_pfd, pollfds,
65 sizeof(pollfds[0]) * pollfds_size);
66 /* remove old pollfds */
67 kfree(pollfds);
68 }
69 pollfds = tmp_pfd;
70 pollfds_size++;
71 } else
72 kfree(tmp_pfd); /* remove not used tmp_pfd */
73
74 pollfds[pollfds_num] = ((struct pollfd) { .fd = fd,
75 .events = events,
76 .revents = 0 });
77 pollfds_num++;
78
79 return 0;
80}
81
82void os_free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg,
83 struct irq_fd *active_fds, struct irq_fd ***last_irq_ptr2)
84{
85 struct irq_fd **prev;
86 int i = 0;
87
88 prev = &active_fds;
89 while (*prev != NULL) {
90 if ((*test)(*prev, arg)) {
91 struct irq_fd *old_fd = *prev;
92 if ((pollfds[i].fd != -1) &&
93 (pollfds[i].fd != (*prev)->fd)) {
94 printk(UM_KERN_ERR "os_free_irq_by_cb - "
95 "mismatch between active_fds and "
96 "pollfds, fd %d vs %d\n",
97 (*prev)->fd, pollfds[i].fd);
98 goto out;
99 }
100
101 pollfds_num--;
102
103 /*
104 * This moves the *whole* array after pollfds[i]
105 * (though it doesn't spot as such)!
106 */
107 memmove(&pollfds[i], &pollfds[i + 1],
108 (pollfds_num - i) * sizeof(pollfds[0]));
109 if (*last_irq_ptr2 == &old_fd->next)
110 *last_irq_ptr2 = prev;
111
112 *prev = (*prev)->next;
113 if (old_fd->type == IRQ_WRITE)
114 ignore_sigio_fd(old_fd->fd);
115 kfree(old_fd);
116 continue;
117 }
118 prev = &(*prev)->next;
119 i++;
120 }
121 out:
122 return;
123}
124
125int os_get_pollfd(int i)
126{
127 return pollfds[i].fd;
128}
129
130void os_set_pollfd(int i, int fd)
131{
132 pollfds[i].fd = fd;
133}
134
135void os_set_ioignore(void)
136{
137 signal(SIGIO, SIG_IGN);
138}