/usr/include/net-snmp/library/file_utils.h is in libsnmp-dev 5.4.3~dfsg-2.4ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89  | #ifndef NETSNMP_FILE_UTILS_H
#define NETSNMP_FILE_UTILS_H
#ifdef __cplusplus
extern "C" {
#endif
    
    /*------------------------------------------------------------------
     *
     * structures
     *
     */
    typedef struct netsnmp_file_s {
        
        /*
         * file name
         */
        char                   *name;
        
        /*
         * file descriptor for the file
         */
        int                     fd;
        /*
         * filesystem flags
         */
        int                     fs_flags;
        /*
         * open/create mode
         */
        mode_t                  mode;
        /*
         * netsnmp flags
         */
        u_int                   ns_flags;
        /*
         * future expansion
         */
        netsnmp_data_list      *extras;
    } netsnmp_file;
    
    /*------------------------------------------------------------------
     *
     * Prototypes
     *
     */
    netsnmp_file * netsnmp_file_create(void);
    netsnmp_file * netsnmp_file_fill(netsnmp_file * filei, const char* name,
                                     int fs_flags, mode_t mode, u_int ns_flags);
    int netsnmp_file_release(netsnmp_file * filei);
    int netsnmp_file_open(netsnmp_file * filei);
    int netsnmp_file_close(netsnmp_file * filei);
        
    /*------------------------------------------------------------------
     *
     * flags
     *
     */
#define NETSNMP_FILE_NO_AUTOCLOSE                         0x00000001
#define NETSNMP_FILE_                                     0x00000002
    /*------------------------------------------------------------------
     *
     * macros
     *
     */
#define NS_FI_AUTOCLOSE(x) (0 == (x & NETSNMP_FILE_NO_AUTOCLOSE))
#define NS_FI_(x) (0 == (x & NETSNMP_FILE_))
    
        
#ifdef __cplusplus
}
#endif
#endif /* NETSNMP_FILE_UTILS_H */
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