python清空linux/unix系统共享内存代码，pythonunix,# -*- coding

python清空linux/unix系统共享内存代码，pythonunix,# -*- coding

# -*- coding: utf-8 -*-# Remove the share memoryimport osimport sysimport getoptdef usage():    print "usage: python rmsharemem.py -h -o <owner> -s size <shmid list>"    print "  -h show help information"    print "  -o <owner> the owner create share memory need to delete"    print "  -s <size>  the share memory size"    print "  <shmid list> the shmid list need to delete"def getsharemem():    sharemap = {}    fp = os.popen('ipcs -m')    lines = fp.readlines()    for l in lines:        if not l.startswith('0x'):            continue        s = l.split()        if sharemap.has_key(s[2]):            sharemap[s[2]].append(s)        else:            sharemap[s[2]] = [s]    #print 'Share memory map:\n', sharemap    return sharemapif __name__ == "__main__":    opts, args = getopt.getopt(sys.argv[1:], "o:hs:")    # opts is the parameter with options    # args is the parameter no ptions    owner = None    size = 0    for o, p in opts:        if o == '-h':            usage()            sys.exit(0)        elif o == '-o':            owner = p        elif o == '-s':            size = p    if not owner:        val = raw_input("Are you sure to remove all share memory?(yes/no)");        if (val <> "yes"):            usage()            sys.exit(0)    count = 0    total = 0    if len(args) > 0:        for shmid in args:            cmd = 'ipcrm -m %s' % shmid            print 'execute command: %s' % cmd            ret = os.system(cmd)            total += 1            if ret == 0:                count += 1                print 'remove %s shared memory success' % shmid            else:                print 'remove %s shared memory failed' % shmid    else:        shmmap = getsharemem()        for o, l in shmmap.items():            if owner and o <> owner:                continue            for p in l:                total += 1                if size and size <> p[4]:                    continue                cmd = 'ipcrm -m %s' % p[1]                print 'execute command: %s' % cmd                ret = os.system(cmd)                if ret == 0:                    count += 1                    print 'remove %s shared memory success' % p[1]                else:                    print 'remove %s shared memory failed' % p[1]    print 'total share memory number = %s' % total    print 'remove success number = %s' % count    sys.exit(0)