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Programming
to get the correct value with unsigned int
Post 302113924 by manoj.rana on Wednesday 11th of April 2007 06:29:50 AM
04-11-2007
struct size
Hi ,
the solution given above is right but i want to correct at one point.
c = b - (unsigned int )sizeof(struct a);
printf("%d\n",c); will print -2 because any struct occupy the memory in chunk of words. and for linux word is 4 bytes. so for char it occupies 4 bytes give one byte to char and pad the rest 3 bytes so sizeof(struct a) gives 12 as size
the solution given above is right but i want to correct at one point.
c = b - (unsigned int )sizeof(struct a);
printf("%d\n",c); will print -2 because any struct occupy the memory in chunk of words. and for linux word is 4 bytes. so for char it occupies 4 bytes give one byte to char and pad the rest 3 bytes so sizeof(struct a) gives 12 as size
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sysinfo
SYSINFO(2) Linux Programmer's Manual SYSINFO(2) NAME
sysinfo - returns information on overall system statistics SYNOPSIS
#include <sys/sysinfo.h> int sysinfo(struct sysinfo *info); DESCRIPTION
Until Linux 2.3.16, sysinfo() used to return information in the following structure: struct sysinfo { long uptime; /* Seconds since boot */ unsigned long loads[3]; /* 1, 5, and 15 minute load averages */ unsigned long totalram; /* Total usable main memory size */ unsigned long freeram; /* Available memory size */ unsigned long sharedram; /* Amount of shared memory */ unsigned long bufferram; /* Memory used by buffers */ unsigned long totalswap; /* Total swap space size */ unsigned long freeswap; /* swap space still available */ unsigned short procs; /* Number of current processes */ char _f[22]; /* Pads structure to 64 bytes */ }; and the sizes were given in bytes. Since Linux 2.3.23 (i386), 2.3.48 (all architectures) the structure is: struct sysinfo { long uptime; /* Seconds since boot */ unsigned long loads[3]; /* 1, 5, and 15 minute load averages */ unsigned long totalram; /* Total usable main memory size */ unsigned long freeram; /* Available memory size */ unsigned long sharedram; /* Amount of shared memory */ unsigned long bufferram; /* Memory used by buffers */ unsigned long totalswap; /* Total swap space size */ unsigned long freeswap; /* swap space still available */ unsigned short procs; /* Number of current processes */ unsigned long totalhigh; /* Total high memory size */ unsigned long freehigh; /* Available high memory size */ unsigned int mem_unit; /* Memory unit size in bytes */ char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding to 64 bytes */ }; and the sizes are given as multiples of mem_unit bytes. sysinfo() provides a simple way of getting overall system statistics. This is more portable than reading /dev/kmem. RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is set appropriately. ERRORS
EFAULT pointer to struct sysinfo is invalid CONFORMING TO
This function is Linux-specific, and should not be used in programs intended to be portable. The Linux kernel has a sysinfo() system call since 0.98.pl6. Linux libc contains a sysinfo() routine since 5.3.5, and glibc has one since 1.90. SEE ALSO
proc(5) COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. Linux 2012-05-05 SYSINFO(2)