__errno_location() = 0x7f631c659698 __errno_location — address of errno variable snapshot from the binary file /bin/ls ^@strstr^@__errno_location^@mempcpy^@_setjmp^ http://refspecs.freestandards.org/LSB_3.1.0/LSB-Core-generic/LSB-Core-generic/baselib-errno-location-1.html