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gerrit-public.fairphone.software / platform / external / ltp / ec6edca7aa42b6affd989ef91b5897f96795e40f / . / testcases / kernel / ipc / ipc_stress / shmem_test_06.c
blob: 8a18c0e658c18b4d181045850c490cec5bc7d99e [file] [log] [blame]
/*
* Copyright (C) Bull S.A. 1996
* Copyright (c) International Business Machines Corp., 2001
* Copyright (C) 2008 CAI Qian <caiqian@cclom.cn>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
/*---------------------------------------------------------------------+
| shmem_test_06.c |
| ==================================================================== |
| Title: Segment Register 0xE |
| |
| Purpose: simultaneous attachment of more than ten shared |
| memory regions to a process. Using segment registers |
| 0x3 to 0xC and 0xE . |
| |
| Description: Simplistic test to verify that a process can obtain |
| 11 shared memory regions. |
| |
| |
| Algorithm: * from 1 up to 11 |
| { |
| o Create a key to uniquely identify the shared segment|
| using ftok() subroutine. |
| o Obtain a unique shared memory identifier with |
| shmget () |
| o Map the shared memory segment to the current |
| process with shmat () |
| o Index through the shared memory segment |
| } |
| * from 1 up to 11 |
| { |
| o Detach from the segment with shmdt() |
| o Release the shared memory segment with shmctl () |
| } |
| |
| System calls: The following system calls are tested: |
| |
| ftok() |
| shmget () |
| shmat () |
| shmdt () |
| shmctl () |
| |
| Usage: shmem_test_06 |
| |
| To compile: cc -O -g shmem_test_06.c -o shmem_test_06 -lbsd |
| |
| Last update: |
| |
| Change Activity |
| |
| Version Date Name Reason |
| 0.1 010797 J.Malcles initial version for 4.2.G |
| |
| |
+---------------------------------------------------------------------*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/shm.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/stat.h>
int offsets_cnt = 11;
/* Defines
*
* MAX_SHMEM_SIZE: maximum shared memory segment size of 256MB
*
* MAX_SHMEM_NUMBER: maximum number of simultaneous attached shared memory
* regions
*
* DEFAULT_SHMEM_SIZE: default shared memory size, unless specified with
* -s command line option
*
* SHMEM_MODE: shared memory access permissions (permit process to read
* and write access)
*
* USAGE: usage statement
*/
#define MAX_SHMEM_SIZE 256*1024*1024
#define MAX_SHMEM_NUMBER 11
#define DEFAULT_SHMEM_SIZE 1024*1024
#define SHMEM_MODE (SHM_R | SHM_W)
#define USAGE "\nUsage: %s [-s shmem_size]\n\n" \
"\t-s shmem_size size of shared memory segment (bytes)\n" \
"\t (must be less than 256MB!)\n\n"
#define GOTHERE printf("got to line %d\n", __LINE__);
/*
* Function prototypes
*
* parse_args (): Parse command line arguments
* sys_error (): System error message function
* error (): Error message function
*/
void parse_args (int, char **);
void sys_error (const char *, int);
void error (const char *, int);
/*
* Global variables
*
* shmem_size: shared memory segment size (in bytes)
*/
int shmem_size = DEFAULT_SHMEM_SIZE;
/*---------------------------------------------------------------------+
| main |
| ==================================================================== |
| |
| |
| Function: Main program (see prolog for more details) |
| |
| Returns: (0) Successful completion |
| (-1) Error occurred |
| |
+---------------------------------------------------------------------*/
int main (int argc, char **argv)
{
int i;
int shmid[MAX_SHMEM_NUMBER]; /* (Unique) Shared memory identifier */
char *shmptr[MAX_SHMEM_NUMBER]; /* Shared memory segment address */
char *ptr; /* Index into shared memory segment */
int value = 0; /* Value written into shared memory segment */
key_t mykey[MAX_SHMEM_NUMBER];
char * null_file = "/dev/null";
char proj[MAX_SHMEM_NUMBER] = {
'3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'E'
};
/*
* Parse command line arguments and print out program header
*/
parse_args (argc, argv);
printf ("%s: IPC Shared Memory TestSuite program\n", *argv);
for (i=0; i<offsets_cnt; i++)
{
char tmpstr[256];
/*
* Create a key to uniquely identify the shared segment
*/
mykey[i] = ftok(null_file,proj[i]);
printf ("\n\tmykey to uniquely identify the shared memory segment 0x%x\n",mykey[i]);
printf ("\n\tGet shared memory segment (%d bytes)\n", shmem_size);
/*
* Obtain a unique shared memory identifier with shmget ().
*/
if ((long)(shmid[i]= shmget (mykey[i], shmem_size, IPC_CREAT | 0666 )) < 0)
sys_error ("shmget failed", __LINE__);
printf ("\n\tAttach shared memory segment to process\n");
if ((long)(shmptr[i] = (char *) shmat (shmid[i], NULL, 0)) == -1)
{
/* If shmat(2) failed, we need the currect process address
space layout to debug. The failure can be random. */
sprintf (tmpstr, "cat /proc/%d/maps >&2", (int) getpid ());
fprintf (stderr, "heap %p\n", sbrk (0));
system (tmpstr);
sprintf(tmpstr, "shmat failed - return: %ld", (long)shmptr[i]);
sys_error (tmpstr, __LINE__);
}
printf ("\n\tShared memory segment address : %p \n",shmptr[i]);
printf ("\n\tIndex through shared memory segment ...\n");
/*
* Index through the shared memory segment
*/
for (ptr=shmptr[i]; ptr < (shmptr[i] + shmem_size); ptr++)
*ptr = value++;
} // for 1..11
printf ("\n\tDetach from the segment using the shmdt subroutine\n");
printf ("\n\tRelease shared memory\n");
for (i=0; i<offsets_cnt; i++)
{
// Detach from the segment
shmdt( shmptr[i] );
// Release shared memory
if (shmctl (shmid[i], IPC_RMID, 0) < 0)
sys_error ("shmctl failed", __LINE__);
} // 2nd for 1..11
/*
* Program completed successfully -- exit
*/
printf ("\nsuccessful!\n");
return (0);
}
/*---------------------------------------------------------------------+
| parse_args () |
| ==================================================================== |
| |
| Function: Parse the command line arguments & initialize global |
| variables. |
| |
| Updates: (command line options) |
| |
| [-s] size: shared memory segment size |
| |
+---------------------------------------------------------------------*/
void parse_args (int argc, char **argv)
{
int i;
int errflag = 0;
char *program_name = *argv;
extern char *optarg; /* Command line option */
while ((i = getopt(argc, argv, "s:?")) != EOF) {
switch (i) {
case 's':
shmem_size = atoi (optarg);
break;
case '?':
errflag++;
break;
}
}
if (shmem_size < 1 || shmem_size > MAX_SHMEM_SIZE)
errflag++;
if (errflag) {
fprintf (stderr, USAGE, program_name);
exit (2);
}
}
/*---------------------------------------------------------------------+
| sys_error () |
| ==================================================================== |
| |
| Function: Creates system error message and calls error () |
| |
+---------------------------------------------------------------------*/
void sys_error (const char *msg, int line)
{
char syserr_msg [256];
sprintf (syserr_msg, "%s: %s\n", msg, strerror (errno));
error (syserr_msg, line);
}
/*---------------------------------------------------------------------+
| error () |
| ==================================================================== |
| |
| Function: Prints out message and exits... |
| |
+---------------------------------------------------------------------*/
void error (const char *msg, int line)
{
fprintf (stderr, "ERROR [line: %d] %s\n", line, msg);
exit (-1);
}