get_phys_pages(3) Library Functions Manual get_phys_pages(3) NAME get_phys_pages, get_avphys_pages - get total and available physical page counts LIBRARY Standard C library (libc, -lc) SYNOPSIS #include <sys/sysinfo.h> long get_phys_pages(void); long get_avphys_pages(void); DESCRIPTION The function get_phys_pages() returns the total number of physical pages of memory available on the system. The function get_avphys_pages() returns the number of currently avail- able physical pages of memory on the system. RETURN VALUE On success, these functions return a nonnegative value as given in DE- SCRIPTION. On failure, they return -1 and set errno to indicate the error. ERRORS ENOSYS The system could not provide the required information (possibly because the /proc filesystem was not mounted). STANDARDS These functions are GNU extensions. NOTES Before glibc 2.23, these functions obtained the required information by scanning the MemTotal and MemFree fields of /proc/meminfo. Since glibc 2.23, these functions obtain the required information by calling sys- info(2). The following sysconf(3) calls provide a portable means of obtaining the same information as the functions described on this page. total_pages = sysconf(_SC_PHYS_PAGES); /* total pages */ avl_pages = sysconf(_SC_AVPHYS_PAGES); /* available pages */ EXAMPLES The following example shows how get_phys_pages() and get_avphys_pages() can be used. #include <stdio.h> #include <stdlib.h> #include <sys/sysinfo.h> int main(void) { printf("This system has %ld pages of physical memory and " "%ld pages of physical memory available.\n", get_phys_pages(), get_avphys_pages()); exit(EXIT_SUCCESS); } SEE ALSO sysconf(3) Linux man-pages 6.03 2022-10-30 get_phys_pages(3)
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