[CRIU] [PATCH 06/21] proc_parse.c: Add read_proc_selffd_link helper

[Cyrill Gorcunov]

Signed-off-by: Cyrill Gorcunov <gorcunov at openvz.org>
---
 include/proc_parse.h |    1 +
 proc_parse.c         |   15 +++++++++++++++
 2 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/include/proc_parse.h b/include/proc_parse.h
index 21e43ce..6dac56b 100644
--- a/include/proc_parse.h
+++ b/include/proc_parse.h
@@ -105,5 +105,6 @@ extern int parse_pid_stat(pid_t pid, struct proc_pid_stat *s);
 extern int parse_pid_stat_small(pid_t pid, struct proc_pid_stat_small *s);
 extern int parse_smaps(pid_t pid, struct list_head *vma_area_list, bool use_map_files);
 extern int parse_pid_status(pid_t pid, struct proc_status_creds *);
+extern char *read_proc_selffd_link(int fd, int *len);
 
 #endif /* PROC_PARSE_H__ */
diff --git a/proc_parse.c b/proc_parse.c
index 6ca23b9..2f943c0 100644
--- a/proc_parse.c
+++ b/proc_parse.c
@@ -665,3 +665,18 @@ err:
 	}
 	goto out;
 }
+
+char *read_proc_selffd_link(int fd, int *len)
+{
+	char local[64];
+
+	snprintf(local, sizeof(local), "/proc/self/fd/%d", fd);
+	*len = readlink(local, buf, BUF_SIZE);
+	if (*len < 0) {
+		pr_perror("Can't readlink %s", local);
+		return NULL;
+	} else
+		buf[*len] = '\0';
+
+	return buf;
+}
-- 
1.7.7.6