/*++ /* NAME /* file_id 3 /* SUMMARY /* file ID printable representation /* SYNOPSIS /* #include <file_id.h> /* /* const char *get_file_id(fd) /* int fd; /* /* int check_file_id(fd, id) /* int fd; /* const char *id; /* DESCRIPTION /* get_file_id() queries the operating system for the unique identifier /* for the specified file and returns a printable representation. /* The result is volatile. Make a copy if it is to be used for any /* appreciable amount of time. /* /* check_file_id() tests if an open file matches the given /* printable FILE ID representation. /* /* Arguments: /* .IP fd /* A valid file descriptor that is associated with an open file. /* .IP id /* Printable file ID. /* DIAGNOSTICS /* All errors are fatal. /* LICENSE /* .ad /* .fi /* The Secure Mailer license must be distributed with this software. /* AUTHOR(S) /* Wietse Venema /* IBM T.J. Watson Research /* P.O. Box 704 /* Yorktown Heights, NY 10598, USA /*--*/ /* System library. */ #include <sys_defs.h> #include <sys/stat.h> #include <string.h> /* Utility library */ #include <msg.h> #include <vstring.h> /* Global library. */ #include "file_id.h" /* get_file_id - lookup file ID, convert to printable form */ const char *get_file_id(int fd) { static VSTRING *result; struct stat st; if (result == 0) result = vstring_alloc(1); if (fstat(fd, &st) < 0) msg_fatal("fstat: %m"); vstring_sprintf(result, "%lX", (long) st.st_ino); return (vstring_str(result)); } /* check_file_id - make sure file name matches ID */ int check_file_id(int fd, const char *name) { return (strcmp(get_file_id(fd), name)); }