1 | #include <dlfcn.h>
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2 | #include <stdlib.h>
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3 | #include <stdarg.h>
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4 | #include "pthread_impl.h"
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5 | #include "libc.h"
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6 |
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7 | char *dlerror()
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8 | {
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9 | pthread_t self = __pthread_self();
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10 | if (!self->dlerror_flag) return 0;
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11 | self->dlerror_flag = 0;
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12 | char *s = self->dlerror_buf;
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13 | if (s == (void *)-1)
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14 | return "Dynamic linker failed to allocate memory for error message";
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15 | else
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16 | return s;
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17 | }
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18 |
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19 | void __dl_thread_cleanup(void)
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20 | {
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21 | pthread_t self = __pthread_self();
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22 | if (self->dlerror_buf != (void *)-1)
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23 | free(self->dlerror_buf);
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24 | }
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25 |
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26 | __attribute__((__visibility__("hidden")))
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27 | void __dl_vseterr(const char *fmt, va_list ap)
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28 | {
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29 | va_list ap2;
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30 | va_copy(ap2, ap);
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31 | pthread_t self = __pthread_self();
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32 | if (self->dlerror_buf != (void *)-1)
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33 | free(self->dlerror_buf);
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34 | size_t len = vsnprintf(0, 0, fmt, ap2);
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35 | va_end(ap2);
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36 | char *buf = malloc(len+1);
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37 | if (buf) {
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38 | vsnprintf(buf, len+1, fmt, ap);
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39 | } else {
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40 | buf = (void *)-1;
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41 | }
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42 | self->dlerror_buf = buf;
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43 | self->dlerror_flag = 1;
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44 | }
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45 |
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46 | __attribute__((__visibility__("hidden")))
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47 | void __dl_seterr(const char *fmt, ...)
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48 | {
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49 | va_list ap;
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50 | va_start(ap, fmt);
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51 | __dl_vseterr(fmt, ap);
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52 | va_end(ap);
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53 | }
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54 |
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55 | __attribute__((__visibility__("hidden")))
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56 | int __dl_invalid_handle(void *);
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57 |
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58 | static int stub_invalid_handle(void *h)
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59 | {
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60 | __dl_seterr("Invalid library handle %p", (void *)h);
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61 | return 1;
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62 | }
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63 |
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64 | weak_alias(stub_invalid_handle, __dl_invalid_handle);
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