NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | STANDARDS | HISTORY | NOTES | EXAMPLES | SEE ALSO | COLOPHON |
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get_phys_pages(3) Library Functions Manual get_phys_pages(3)
get_phys_pages, get_avphys_pages - get total and available physical page counts
Standard C library (libc, -lc)
#include <sys/sysinfo.h> long get_phys_pages(void); long get_avphys_pages(void);
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 available physical pages of memory on the system.
On success, these functions return a nonnegative value as given in DESCRIPTION. On failure, they return -1 and set errno to indicate the error.
ENOSYS The system could not provide the required information (possibly because the /proc filesystem was not mounted).
GNU.
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 sysinfo(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 */
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); }
sysconf(3)
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Linux man-pages 6.9.1 2024-06-15 get_phys_pages(3)
Pages that refer to this page: undocumented(3)