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Alex Rivera
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So I was looking through the linux glibc source and I don't see where it actually does anything. The following is from io/chdir.c but it is indicative of many of the source files. What's going on here? Obviously I am missing something. What's the secret, where does it make a system call or actually do something? stub_warning is some legacy craziness. __set_errno seems to be a simple macro that sets errno . And while I find a million usages of weak_alias I don't see it defined anywhere. Is there a helpful guide to understanding how glibc works somewhere? #include <errno.h> #include <stddef.h> #include <unistd.h> /* Change the current directory to PATH. */ int __chdir (path) const char *path; { if (path == NULL) { __set_errno (EINVAL); return -1; } __set_errno (ENOSYS); return -1; } stub_warning (chdir) weak_alias (__chdir, chdir) #include <stub-tag.h>
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