1 | #include <aio.h>
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2 | #include <errno.h>
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3 | #include <unistd.h>
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4 | #include <string.h>
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5 | #include "pthread_impl.h"
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6 | #include "libc.h"
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7 |
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8 | struct lio_state {
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9 | struct sigevent *sev;
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10 | int cnt;
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11 | struct aiocb *cbs[];
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12 | };
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13 |
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14 | static int lio_wait(struct lio_state *st)
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15 | {
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16 | int i, err, got_err = 0;
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17 | int cnt = st->cnt;
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18 | struct aiocb **cbs = st->cbs;
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19 |
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20 | for (;;) {
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21 | for (i=0; i<cnt; i++) {
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22 | if (!cbs[i]) continue;
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23 | err = aio_error(cbs[i]);
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24 | if (err==EINPROGRESS)
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25 | break;
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26 | if (err) got_err=1;
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27 | cbs[i] = 0;
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28 | }
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29 | if (i==cnt) {
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30 | if (got_err) {
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31 | errno = EIO;
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32 | return -1;
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33 | }
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34 | return 0;
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35 | }
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36 | if (aio_suspend((void *)cbs, cnt, 0))
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37 | return -1;
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38 | }
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39 | }
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40 |
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41 | static void notify_signal(struct sigevent *sev)
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42 | {
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43 | siginfo_t si = {
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44 | .si_signo = sev->sigev_signo,
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45 | .si_value = sev->sigev_value,
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46 | .si_code = SI_ASYNCIO,
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47 | .si_pid = getpid(),
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48 | .si_uid = getuid()
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49 | };
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50 | __syscall(SYS_rt_sigqueueinfo, si.si_pid, si.si_signo, &si);
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51 | }
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52 |
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53 | static void *wait_thread(void *p)
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54 | {
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55 | struct lio_state *st = p;
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56 | struct sigevent *sev = st->sev;
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57 | lio_wait(st);
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58 | free(st);
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59 | switch (sev->sigev_notify) {
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60 | case SIGEV_SIGNAL:
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61 | notify_signal(sev);
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62 | break;
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63 | case SIGEV_THREAD:
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64 | sev->sigev_notify_function(sev->sigev_value);
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65 | break;
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66 | }
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67 | return 0;
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68 | }
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69 |
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70 | int lio_listio(int mode, struct aiocb *restrict const *restrict cbs, int cnt, struct sigevent *restrict sev)
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71 | {
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72 | int i, ret;
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73 | struct lio_state *st=0;
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74 |
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75 | if (cnt < 0) {
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76 | errno = EINVAL;
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77 | return -1;
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78 | }
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79 |
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80 | if (mode == LIO_WAIT || (sev && sev->sigev_notify != SIGEV_NONE)) {
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81 | if (!(st = malloc(sizeof *st + cnt*sizeof *cbs))) {
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82 | errno = EAGAIN;
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83 | return -1;
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84 | }
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85 | st->cnt = cnt;
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86 | st->sev = sev;
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87 | memcpy(st->cbs, (void*) cbs, cnt*sizeof *cbs);
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88 | }
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89 |
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90 | for (i=0; i<cnt; i++) {
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91 | if (!cbs[i]) continue;
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92 | switch (cbs[i]->aio_lio_opcode) {
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93 | case LIO_READ:
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94 | ret = aio_read(cbs[i]);
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95 | break;
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96 | case LIO_WRITE:
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97 | ret = aio_write(cbs[i]);
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98 | break;
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99 | default:
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100 | continue;
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101 | }
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102 | if (ret) {
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103 | free(st);
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104 | errno = EAGAIN;
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105 | return -1;
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106 | }
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107 | }
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108 |
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109 | if (mode == LIO_WAIT) {
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110 | ret = lio_wait(st);
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111 | free(st);
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112 | return ret;
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113 | }
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114 |
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115 | if (st) {
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116 | pthread_attr_t a;
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117 | sigset_t set;
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118 | pthread_t td;
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119 |
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120 | if (sev->sigev_notify == SIGEV_THREAD) {
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121 | if (sev->sigev_notify_attributes)
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122 | a = *sev->sigev_notify_attributes;
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123 | else
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124 | pthread_attr_init(&a);
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125 | } else {
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126 | pthread_attr_init(&a);
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127 | pthread_attr_setstacksize(&a, PAGE_SIZE);
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128 | pthread_attr_setguardsize(&a, 0);
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129 | }
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130 | pthread_attr_setdetachstate(&a, PTHREAD_CREATE_DETACHED);
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131 | sigfillset(&set);
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132 | pthread_sigmask(SIG_BLOCK, &set, &set);
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133 | if (pthread_create(&td, &a, wait_thread, st)) {
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134 | free(st);
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135 | errno = EAGAIN;
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136 | return -1;
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137 | }
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138 | pthread_sigmask(SIG_SETMASK, &set, 0);
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139 | }
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140 |
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141 | return 0;
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142 | }
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143 |
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144 | LFS64(lio_listio);
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