get_free_memory_size() reads /proc/meminfo and consider "MemFree:" the amount of free memory.
Signed-off-by: Atsushi Kumagai <[email protected]> --- makedumpfile.c | 34 ++++++++++++++++++++++++++++++++++ makedumpfile.h | 1 + 2 files changed, 35 insertions(+) diff --git a/makedumpfile.c b/makedumpfile.c index 1183330..73a466e 100644 --- a/makedumpfile.c +++ b/makedumpfile.c @@ -7972,6 +7972,40 @@ out: return ret; } +/* + * Get the amount of free memory from /proc/meminfo. + */ +unsigned long long +get_free_memory_size(void) { + char buf[BUFSIZE_FGETS]; + char unit[4]; + unsigned long long free_size = 0; + char *name_meminfo = "/proc/meminfo"; + FILE *file_meminfo; + + if ((file_meminfo = fopen(name_meminfo, "r")) == NULL) { + ERRMSG("Can't open the %s. %s\n", name_meminfo, strerror(errno)); + return FALSE; + } + + while (fgets(buf, BUFSIZE_FGETS, file_meminfo) != NULL) { + if (sscanf(buf, "MemFree: %llu %s", &free_size, unit) == 2) { + if (strcmp(unit, "kB") == 0) { + free_size *= 1024; + goto out; + } + } + } + + ERRMSG("Can't get free memory size.\n"); + free_size = 0; +out: + if (fclose(file_meminfo) < 0) + ERRMSG("Can't close the %s. %s\n", name_meminfo, strerror(errno)); + + return free_size; +} + static struct option longopts[] = { {"split", no_argument, NULL, 's'}, {"reassemble", no_argument, NULL, 'r'}, diff --git a/makedumpfile.h b/makedumpfile.h index 97aca2a..c91b4e9 100644 --- a/makedumpfile.h +++ b/makedumpfile.h @@ -1611,5 +1611,6 @@ struct elf_prstatus { unsigned long long get_num_dumpable_cyclic(void); int get_loads_dumpfile_cyclic(void); int initial_xen(void); +unsigned long long get_free_memory_size(void); #endif /* MAKEDUMPFILE_H */ -- 1.7.11 _______________________________________________ kexec mailing list [email protected] http://lists.infradead.org/mailman/listinfo/kexec
