factor/vm/os-linux.cpp

33 lines
796 B
C++

#include "master.hpp"
namespace factor {
const char* vm_executable_path() {
ssize_t bufsiz = 4096;
/* readlink is called in a loop with increasing buffer sizes in case
someone tries to run Factor from a incredibly deeply nested
path. */
while (true) {
char* buf = new char[bufsiz + 1];
ssize_t size= readlink("/proc/self/exe", buf, bufsiz);
if (size < 0) {
fatal_error("Cannot read /proc/self/exe", errno);
} else {
if (size < bufsiz) {
/* Buffer was large enough, return string. */
buf[size] = '\0';
const char* ret = safe_strdup(buf);
delete[] buf;
return ret;
} else {
/* Buffer wasn't big enough, double it and try again. */
delete[] buf;
bufsiz *= 2;
}
}
}
}
}