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#include <dlfcn.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifndef LINKER
#error LINKER must be defined
#endif
static char *(*real_realpath)(const char *restrict, char *restrict);
char *realpath(const char *restrict path, char *restrict resolved)
{
if (real_realpath == NULL) {
real_realpath = dlsym(RTLD_NEXT, "realpath");
if (real_realpath == NULL) {
errno = ENOSYS;
return NULL;
}
}
if (!strcmp(path, "/proc/self/exe")) {
char *fixed = resolved;
if (fixed == NULL) {
fixed = malloc(PATH_MAX);
if (fixed == NULL) {
errno = ENOMEM;
return NULL;
}
}
/* If passed in, the buffer is at least PATH_MAX per POSIX. */
ssize_t written = readlink(path, fixed, PATH_MAX - 1);
if (written == -1) {
/* Free the buffer iff we allocated it. */
if (fixed != resolved)
free(fixed);
return NULL;
}
fixed[written] = '\0';
return fixed;
}
return real_realpath(path, resolved);
}
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