[ebf9a05] | 1 | /* |
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| 2 | * Copyright (C) 2014 Chris Johns (chrisj@rtems.org) |
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| 3 | * |
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| 4 | * The license and distribution terms for this file may be |
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| 5 | * found in the file LICENSE in this distribution. |
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| 6 | * |
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| 7 | * This software with is provided ``as is'' and with NO WARRANTY. |
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| 8 | */ |
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| 9 | |
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| 10 | /* |
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| 11 | * RTEMS std redirector. |
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| 12 | */ |
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| 13 | |
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| 14 | #include <errno.h> |
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| 15 | #include <stdio.h> |
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| 16 | #include <stdlib.h> |
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[b2ed712] | 17 | #include <string.h> |
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[ebf9a05] | 18 | #include <strings.h> |
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| 19 | #include <sys/types.h> |
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| 20 | #include <unistd.h> |
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| 21 | |
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[2fd31117] | 22 | #include <rtems/thread.h> |
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[ebf9a05] | 23 | #include <rtems/error.h> |
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[a1626726] | 24 | #include <rtems/stdio-redirect.h> |
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[ebf9a05] | 25 | |
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| 26 | #define RTEMS_STDIO_REDIRECT_RUNNING (1 << 0) |
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| 27 | #define RTEMS_STDIO_REDIRECT_FINISHED (1 << 1) |
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| 28 | |
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[2fd31117] | 29 | static void |
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[c040b113] | 30 | rtems_stdio_redirect_lock(rtems_stdio_redirect* sr) |
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[ebf9a05] | 31 | { |
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[2fd31117] | 32 | rtems_mutex_lock(&sr->lock); |
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[ebf9a05] | 33 | } |
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| 34 | |
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[2fd31117] | 35 | static void |
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[c040b113] | 36 | rtems_stdio_redirect_unlock(rtems_stdio_redirect* sr) |
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[ebf9a05] | 37 | { |
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[2fd31117] | 38 | rtems_mutex_unlock(&sr->lock); |
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[ebf9a05] | 39 | } |
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| 40 | |
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[2fd31117] | 41 | static void |
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[c040b113] | 42 | rtems_stdio_redirect_write (rtems_stdio_redirect* sr, const char* buf, ssize_t len) |
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[ebf9a05] | 43 | { |
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[2fd31117] | 44 | rtems_stdio_redirect_lock(sr); |
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[ebf9a05] | 45 | |
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| 46 | if (sr->buffer) |
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| 47 | { |
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| 48 | if (len >= sr->buffer_size) |
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| 49 | { |
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| 50 | ssize_t offset = len - sr->buffer_size; |
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| 51 | memcpy (sr->buffer, buf + offset, sr->buffer_size); |
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| 52 | sr->in = 0; |
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| 53 | sr->full = true; |
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| 54 | } |
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| 55 | else |
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| 56 | { |
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| 57 | if ((sr->in + len) > sr->buffer_size) |
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| 58 | { |
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| 59 | ssize_t bytes = sr->buffer_size - sr->in; |
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| 60 | memcpy (sr->buffer + sr->in, buf, bytes); |
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| 61 | buf += bytes; |
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| 62 | len -= bytes; |
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| 63 | sr->in = 0; |
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| 64 | sr->full = true; |
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| 65 | } |
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| 66 | else |
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| 67 | { |
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| 68 | memcpy (sr->buffer + sr->in, buf, len); |
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| 69 | sr->in += len; |
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| 70 | } |
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| 71 | } |
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| 72 | } |
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| 73 | |
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| 74 | if (sr->handler) |
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| 75 | sr->handler(buf, len); |
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| 76 | |
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[2fd31117] | 77 | rtems_stdio_redirect_unlock(sr); |
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[ebf9a05] | 78 | } |
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| 79 | |
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| 80 | static rtems_task |
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| 81 | rtems_stdio_redirect_reader(rtems_task_argument arg) |
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| 82 | { |
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[c040b113] | 83 | rtems_stdio_redirect* sr = (rtems_stdio_redirect*) arg; |
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[ebf9a05] | 84 | |
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| 85 | while (sr->state & RTEMS_STDIO_REDIRECT_RUNNING) |
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| 86 | { |
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| 87 | ssize_t r = read (sr->pipe[0], sr->input, sr->input_size); |
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| 88 | |
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| 89 | if (r <= 0) |
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| 90 | break; |
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| 91 | |
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| 92 | if (sr->echo) |
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| 93 | write (sr->fd_dup, sr->input, r); |
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| 94 | |
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[2fd31117] | 95 | rtems_stdio_redirect_write (sr, sr->input, r); |
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[ebf9a05] | 96 | } |
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| 97 | |
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| 98 | sr->state |= RTEMS_STDIO_REDIRECT_FINISHED; |
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| 99 | |
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| 100 | rtems_task_delete(RTEMS_SELF); |
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| 101 | } |
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| 102 | |
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[c040b113] | 103 | rtems_stdio_redirect* |
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[ebf9a05] | 104 | rtems_stdio_redirect_open(int fd, |
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| 105 | rtems_task_priority priority, |
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| 106 | size_t stack_size, |
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| 107 | ssize_t input_size, |
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| 108 | ssize_t buffer_size, |
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| 109 | bool echo, |
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| 110 | rtems_stdio_redirect_handler handler) |
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| 111 | { |
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[c040b113] | 112 | rtems_stdio_redirect* sr; |
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| 113 | rtems_name name; |
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| 114 | rtems_status_code sc; |
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[ebf9a05] | 115 | |
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[c040b113] | 116 | sr = malloc(sizeof(*sr)); |
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[ebf9a05] | 117 | if (!sr) |
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| 118 | { |
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| 119 | fprintf(stderr, "error: stdio-redirect: no memory\n"); |
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| 120 | return NULL; |
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| 121 | } |
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| 122 | |
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| 123 | memset(sr, 0, sizeof(*sr)); |
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| 124 | |
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| 125 | sr->input_size = input_size; |
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| 126 | sr->input = malloc(input_size); |
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| 127 | if (!sr->input) |
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| 128 | { |
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| 129 | fprintf(stderr, "error: stdio-redirect: no memory for input\n"); |
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| 130 | free(sr); |
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| 131 | return NULL; |
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| 132 | } |
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| 133 | |
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| 134 | if (buffer_size) |
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| 135 | { |
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| 136 | sr->buffer_size = buffer_size; |
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| 137 | sr->buffer = malloc(buffer_size); |
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| 138 | if (!sr->buffer) |
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| 139 | { |
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| 140 | fprintf(stderr, "error: stdio-redirect: no memory for buffer\n"); |
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| 141 | free(sr->input); |
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| 142 | free(sr); |
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| 143 | return NULL; |
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| 144 | } |
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| 145 | } |
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| 146 | |
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| 147 | sr->fd = fd; |
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| 148 | |
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| 149 | sr->fd_dup = dup(fd); |
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| 150 | if (sr->fd_dup < 0) |
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| 151 | { |
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| 152 | fprintf(stderr, "error: stdio-redirect: dup: %s\n", strerror(errno)); |
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| 153 | free(sr->buffer); |
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| 154 | free(sr->input); |
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| 155 | free(sr); |
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| 156 | return NULL; |
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| 157 | } |
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| 158 | |
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| 159 | if (pipe(sr->pipe) < 0) |
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| 160 | { |
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| 161 | fprintf(stderr, "error: stdio-redirect: pipe create: %s\n", strerror(errno)); |
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| 162 | free(sr->buffer); |
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| 163 | free(sr->input); |
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| 164 | free(sr); |
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| 165 | return NULL; |
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| 166 | |
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| 167 | } |
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| 168 | |
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| 169 | sr->echo = echo; |
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| 170 | sr->handler = handler; |
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| 171 | |
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[2fd31117] | 172 | rtems_mutex_init(&sr->lock, "stdio-redirect"); |
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[ebf9a05] | 173 | |
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| 174 | name = rtems_build_name ('S', 'R', '0' + (fd / 10), '0' + (fd % 10)); |
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| 175 | sc = rtems_task_create (name, |
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| 176 | priority, |
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| 177 | stack_size, |
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| 178 | RTEMS_PREEMPT | RTEMS_NO_TIMESLICE | RTEMS_NO_ASR, |
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| 179 | RTEMS_LOCAL | RTEMS_NO_FLOATING_POINT, |
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| 180 | &sr->reader); |
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| 181 | if (sc != RTEMS_SUCCESSFUL) |
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| 182 | { |
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| 183 | fprintf(stderr, "error: stdio-redirect: reader create: %s\n", rtems_status_text(sc)); |
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[2fd31117] | 184 | rtems_mutex_destroy(&sr->lock); |
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[ebf9a05] | 185 | free(sr->buffer); |
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| 186 | free(sr->input); |
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| 187 | free(sr); |
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| 188 | return NULL; |
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| 189 | } |
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| 190 | |
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| 191 | sr->state |= RTEMS_STDIO_REDIRECT_RUNNING; |
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| 192 | |
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| 193 | if (dup2 (sr->pipe[1], fd) < 0) |
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| 194 | { |
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| 195 | fprintf(stderr, "error: stdio-redirect: dup2: %s\n", strerror(errno)); |
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| 196 | free(sr->buffer); |
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| 197 | free(sr->input); |
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| 198 | free(sr); |
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| 199 | return NULL; |
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| 200 | } |
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| 201 | |
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| 202 | sc = rtems_task_start (sr->reader, |
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| 203 | rtems_stdio_redirect_reader, |
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| 204 | (rtems_task_argument) sr); |
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| 205 | |
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| 206 | if (sc != RTEMS_SUCCESSFUL) |
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| 207 | { |
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| 208 | fprintf(stderr, "error: stdio-redirect: reader start: %s\n", rtems_status_text(sc)); |
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| 209 | rtems_task_delete(sr->reader); |
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[2fd31117] | 210 | rtems_mutex_destroy(&sr->lock); |
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[ebf9a05] | 211 | free(sr->buffer); |
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| 212 | free(sr->input); |
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| 213 | free(sr); |
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| 214 | return NULL; |
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| 215 | } |
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| 216 | |
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| 217 | return sr; |
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| 218 | } |
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| 219 | |
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| 220 | void |
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[c040b113] | 221 | rtems_stdio_redirect_close(rtems_stdio_redirect* sr) |
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[ebf9a05] | 222 | { |
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[2fd31117] | 223 | rtems_stdio_redirect_lock(sr); |
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[ebf9a05] | 224 | |
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[2fd31117] | 225 | sr->state &= ~RTEMS_STDIO_REDIRECT_RUNNING; |
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| 226 | close(sr->pipe[0]); |
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[ebf9a05] | 227 | |
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[2fd31117] | 228 | rtems_stdio_redirect_unlock(sr); |
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| 229 | |
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| 230 | while (sr->state & RTEMS_STDIO_REDIRECT_FINISHED) |
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| 231 | { |
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| 232 | usleep(250UL * 1000000UL); |
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| 233 | } |
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[ebf9a05] | 234 | |
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[2fd31117] | 235 | rtems_stdio_redirect_lock(sr); |
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[ebf9a05] | 236 | |
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[2fd31117] | 237 | dup2(sr->fd, sr->fd_dup); |
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[ebf9a05] | 238 | |
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[2fd31117] | 239 | free(sr->buffer); |
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| 240 | free(sr->input); |
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[ebf9a05] | 241 | |
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[2fd31117] | 242 | rtems_stdio_redirect_unlock(sr); |
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[ebf9a05] | 243 | |
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[2fd31117] | 244 | rtems_mutex_destroy(&sr->lock); |
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[ebf9a05] | 245 | |
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[2fd31117] | 246 | free(sr); |
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[ebf9a05] | 247 | } |
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| 248 | |
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| 249 | ssize_t |
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[c040b113] | 250 | rtems_stdio_redirect_read(rtems_stdio_redirect* sr, |
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| 251 | char* buffer, |
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| 252 | ssize_t length) |
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[ebf9a05] | 253 | { |
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| 254 | ssize_t written = 0; |
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| 255 | |
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[2fd31117] | 256 | rtems_stdio_redirect_lock(sr); |
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[ebf9a05] | 257 | |
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| 258 | if (sr->buffer) |
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| 259 | { |
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| 260 | ssize_t rem = 0; |
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| 261 | |
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| 262 | if (sr->full) |
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| 263 | { |
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| 264 | if (length < sr->buffer_size) |
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| 265 | { |
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| 266 | if (length > sr->in) |
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| 267 | { |
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| 268 | rem = length - sr->in; |
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| 269 | memcpy (buffer, sr->buffer + sr->buffer_size - rem, rem); |
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| 270 | } |
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| 271 | |
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| 272 | memcpy (buffer + rem, sr->buffer, sr->in); |
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| 273 | written = length; |
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| 274 | } |
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| 275 | else |
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| 276 | { |
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| 277 | rem = sr->buffer_size - sr->in; |
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| 278 | memcpy (buffer, sr->buffer + sr->in, rem); |
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| 279 | memcpy (buffer + rem, sr->buffer, sr->in); |
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| 280 | written = sr->buffer_size; |
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| 281 | } |
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| 282 | |
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| 283 | sr->full = false; |
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| 284 | } |
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| 285 | else if (length < sr->in) |
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| 286 | { |
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| 287 | rem = sr->in - length; |
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| 288 | memcpy (buffer, sr->buffer + rem, length); |
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| 289 | written = length; |
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| 290 | } |
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| 291 | else |
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| 292 | { |
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| 293 | memcpy (buffer, sr->buffer, sr->in); |
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| 294 | written = sr->in; |
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| 295 | } |
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| 296 | } |
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| 297 | |
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| 298 | rtems_stdio_redirect_unlock(sr); |
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| 299 | |
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| 300 | return written; |
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| 301 | } |
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