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Red Hat Bugzilla – Attachment 315208 Details for
Bug 460521
[5.2] LTP shmem_test_06 random failure
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shmem_test_06 test case
shmem_test_06.c (text/plain), 11.74 KB, created by
Qian Cai
on 2008-08-28 12:46:45 UTC
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Description:
shmem_test_06 test case
Filename:
MIME Type:
Creator:
Qian Cai
Created:
2008-08-28 12:46:45 UTC
Size:
11.74 KB
patch
obsolete
>/* > * Copyright (C) Bull S.A. 1996 > * Copyright (c) International Business Machines Corp., 2001 > * > * 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 in the adress space from | >| 0x30000000 to 0xCFFFFFFF and 0xE0000000 to 0xEFFFFFFF. | >| | >| | >| 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> >off_t offsets[] = { >0x20000000, >0x30000000, >0x48000000, >0x50000000, >0x60000000, >0x70000000, >0x80000000, >0x90000000, >0xA0000000, >0xB0000000, >0xBFE00000, >}; >int offsets_cnt = sizeof (offsets) /sizeof (offsets[0]); >/* 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) >{ > off_t offset; > 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"); > /* > * Attach the shared memory segment to the process > */ > offset = offsets[i]; > > if ((long)(shmptr[i] = (char *) shmat (shmid[i], (const void*)offset, 0)) == -1) > { > sprintf(tmpstr, "shmat failed - return: %p", shmptr[i]); > sys_error (tmpstr, __LINE__); > } > > > printf ("\n\tShared memory segment address : 0x%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); >}
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