In 'struct acct', 'struct acct_v3', and 'struct taskstats' we have a 32-bit 'ac_btime' field containing an absolute time value, which will overflow in year 2106. There are two possible ways to deal with it: a) let it overflow and have user space code deal with reconstructing the data based on the current time, or b) truncate the times based on the range of the u32 type. Neither of them solves the actual problem. Pick the second one to best document what the issue is, and have someone fix it in a future version.
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| @@ -49,6 +49,7 @@ struct acct · 48 unmodified lines | ||
| 49 | 49 | __u16 ac_uid16; /* LSB of Real User ID */ |
| 50 | 50 | __u16 ac_gid16; /* LSB of Real Group ID */ |
| 51 | 51 | __u16 ac_tty; /* Control Terminal */ |
| 52 | + /* __u32 range means times from 1970 to 2106 */ | |
| 52 | 53 | __u32 ac_btime; /* Process Creation Time */ |
| 53 | 54 | comp_t ac_utime; /* User Time */ |
| 54 | 55 | comp_t ac_stime; /* System Time */ |
| @@ -81,6 +82,7 @@ struct acct_v3 · 26 unmodified lines | ||
| 81 | 82 | __u32 ac_gid; /* Real Group ID */ |
| 82 | 83 | __u32 ac_pid; /* Process ID */ |
| 83 | 84 | __u32 ac_ppid; /* Parent Process ID */ |
| 85 | + /* __u32 range means times from 1970 to 2106 */ | |
| 84 | 86 | __u32 ac_btime; /* Process Creation Time */ |
| 85 | 87 | #ifdef __KERNEL__ |
| 86 | 88 | __u32 ac_etime; /* Elapsed Time */ |
| @@ -112,6 +112,7 @@ struct taskstats { · 111 unmodified lines | ||
| 112 | 112 | __u32 ac_gid; /* Group ID */ |
| 113 | 113 | __u32 ac_pid; /* Process ID */ |
| 114 | 114 | __u32 ac_ppid; /* Parent process ID */ |
| 115 | + /* __u32 range means times from 1970 to 2106 */ | |
| 115 | 116 | __u32 ac_btime; /* Begin time [sec since 1970] */ |
| 116 | 117 | __u64 ac_etime __attribute__((aligned(8))); |
| 117 | 118 | /* Elapsed time [usec] */ |