From 5e61585d76ae77fd5e9e96ebabb57afa4d74880d Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 14:06:34 +0200 Subject: Adding upstream version 3.5.24. Signed-off-by: Daniel Baumann --- src/util/sane_link.c | 72 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 72 insertions(+) create mode 100644 src/util/sane_link.c (limited to 'src/util/sane_link.c') diff --git a/src/util/sane_link.c b/src/util/sane_link.c new file mode 100644 index 0000000..de83564 --- /dev/null +++ b/src/util/sane_link.c @@ -0,0 +1,72 @@ +/*++ +/* NAME +/* sane_link 3 +/* SUMMARY +/* sanitize link() error returns +/* SYNOPSIS +/* #include +/* +/* int sane_link(from, to) +/* const char *from; +/* const char *to; +/* DESCRIPTION +/* sane_link() implements the link(2) system call, and works +/* around some errors that are possible with NFS file systems. +/* 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 +#include +#include + +/* Utility library. */ + +#include "msg.h" +#include "sane_fsops.h" +#include "warn_stat.h" + +/* sane_link - sanitize link() error returns */ + +int sane_link(const char *from, const char *to) +{ + const char *myname = "sane_link"; + int saved_errno; + struct stat from_st; + struct stat to_st; + + /* + * Normal case: link() succeeds. + */ + if (link(from, to) >= 0) + return (0); + + /* + * Woops. Save errno, and see if the error is an NFS artefact. If it is, + * pretend the error never happened. + */ + saved_errno = errno; + if (stat(from, &from_st) >= 0 && stat(to, &to_st) >= 0 + && from_st.st_dev == to_st.st_dev + && from_st.st_ino == to_st.st_ino) { + msg_info("%s(%s,%s): worked around spurious NFS error", + myname, from, to); + return (0); + } + + /* + * Nope, it didn't. Restore errno and report the error. + */ + errno = saved_errno; + return (-1); +} -- cgit v1.2.3