[352] | 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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