util: set cr_errno to ESRCH if no PID dir in proc

Signed-off-by: Ruslan Kuprieiev <kupruser@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

include/cr-errno.h

@@ -4,4 +4,9 @@
 void set_cr_errno(int err);
 int get_cr_errno(void);
 
+/*
+ * List of symbolic error names:
+ * ESRCH	- no process can be found corresponding to that specified by pid
+ */
+
 #endif /* __CR_ERRNO_H__ */

util.c

@@ -43,6 +43,8 @@
 #include "cr-service.h"
 #include "files.h"
 
+#include "cr-errno.h"
+
 #define VMA_OPT_LEN	128
 
 static void vma_opt_str(const struct vma_area *v, char *opt)
@@ -274,6 +276,7 @@ inline int open_pid_proc(pid_t pid)
 	fd = openat(dfd, path, O_RDONLY);
 	if (fd < 0) {
 		pr_perror("Can't open %s", path);
+		set_cr_errno(ESRCH);
 		return -1;
 	}