6329328daf
Instead of using and checking malloc'd error strings formatted with asprintf and passed through a pointer in function arguments, use a global thread-local statically allocated error buffer with functions to set and get it. This is more efficient, less error-prone, and easier to use than the old method, especially now that NM is larger (meaning that errors are returned through multiple layers) and parts of it are re-used in other things.
21 lines
625 B
C
21 lines
625 B
C
#ifndef NM_DLHOOK_H
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#define NM_DLHOOK_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "util.h"
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// nm_dlhook takes a lib handle from dlopen and redirects the specified symbol
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// to another, returning a pointer to the original one. Only calls from within
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// that library itself are affected (because it replaces that library's GOT).
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// This function requires glibc and Linux. It should work on any architecture,
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// and it should be resilient to most errors. If it fails, NULL is returned and
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// nm_err is set.
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NM_PRIVATE void *nm_dlhook(void *handle, const char *symname, void *target);
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#ifdef __cplusplus
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}
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#endif
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#endif
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