From: Fabien Siron <fabien.siron@epita.fr>
Date: Thu, 26 May 2016 10:59:07 +0000 (+0000)
Subject: Introduce getfdinode to obtain inode from fd
X-Git-Tag: v4.18~125
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=f26c22d8b261c80fbc2462a90018cc69b8dfc584;p=strace

Introduce getfdinode to obtain inode from fd

* defs.h (getfdinode): New prototype.
* utils.c (getfdinode): New function.

Co-authored-by: Dmitry V. Levin <ldv@altlinux.org>
---

diff --git a/defs.h b/defs.h
index 0837b9ce..38fedfc1 100644
--- a/defs.h
+++ b/defs.h
@@ -494,6 +494,7 @@ extern const char *signame(const int);
 extern void pathtrace_select(const char *);
 extern int pathtrace_match(struct tcb *);
 extern int getfdpath(struct tcb *, int, char *, unsigned);
+extern unsigned long getfdinode(struct tcb *, int);
 extern enum sock_proto getfdproto(struct tcb *, int);
 
 extern const char *xlookup(const struct xlat *, const uint64_t);
diff --git a/util.c b/util.c
index e33b0a95..c4128def 100644
--- a/util.c
+++ b/util.c
@@ -630,6 +630,24 @@ getfdproto(struct tcb *tcp, int fd)
 #endif
 }
 
+unsigned long
+getfdinode(struct tcb *tcp, int fd)
+{
+	char path[PATH_MAX + 1];
+
+	if (getfdpath(tcp, fd, path, sizeof(path)) >= 0) {
+		const char *str = STR_STRIP_PREFIX(path, "socket:[");
+
+		if (str != path) {
+			const size_t str_len = strlen(str);
+			if (str_len && str[str_len - 1] == ']')
+				return strtoul(str, NULL, 10);
+		}
+	}
+
+	return 0;
+}
+
 void
 printfd(struct tcb *tcp, int fd)
 {