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parse: add a helper to obtain an uptime

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will be used in the next patch

https://jira.sw.ru/browse/PSBM-67502

note: man for /proc/uptime says that uptime is in seconds and for now
the format is "seconds.centiseconds", where ecentiseconds is 2 digits

v8: add length specifier to parse only centiseconds

Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
This commit is contained in:
Pavel Tikhomirov
2018-02-22 14:49:19 +03:00
committed by Andrei Vagin
parent 3930040274
commit cf2f035d9f
2 changed files with 25 additions and 0 deletions
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1
criu/include/proc_parse.h
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@@ -108,5 +108,6 @@ int parse_children(pid_t pid, pid_t **_c, int *_n);
extern bool is_vma_range_fmt(char *line); extern bool is_vma_range_fmt(char *line);
extern void parse_vmflags(char *buf, u32 *flags, u64 *madv, int *io_pf); extern void parse_vmflags(char *buf, u32 *flags, u64 *madv, int *io_pf);
extern int parse_uptime(struct timeval *_tv);
#endif /* __CR_PROC_PARSE_H__ */ #endif /* __CR_PROC_PARSE_H__ */

24
criu/proc_parse.c
View File

@@ -2712,3 +2712,27 @@ err:
xfree(ch); xfree(ch);
return -1; return -1;
} }
__maybe_unused int parse_uptime(struct timeval *_tv)
{
unsigned long sec, csec;
FILE *f;
f = fopen("/proc/uptime", "r");
if (!f) {
pr_perror("Failed to fopen /proc/uptime");
return -1;
}
if (fscanf(f, "%lu.%2lu", &sec, &csec) != 2) {
pr_perror("Failed to parse /proc/uptime");
fclose(f);
return -1;
}
_tv->tv_sec = sec;
_tv->tv_usec = csec * (USEC_PER_SEC / 100);
fclose(f);
return 0;
}