int pthread_create(pthread_t *thread, const pthread_attr_t *attr, void *(*start_routine) (void *), void *arg) {
int core;
int ret;
cpu_set_t mask;
CPU_ZERO(&mask);
ret = old_pthread_create(thread, attr, start_routine, arg);
if(!get_shm()->active)
return ret;
core = get_next_core();
if(!get_shm()->per_node) {
CPU_SET(core, &mask);
} else {
int i, node = numa_node_of_cpu(core);
struct bitmask * bmp = numa_allocate_cpumask();
numa_node_to_cpus(node, bmp);
for(i = 0; i < numa_num_configured_cpus(); i++) {
if(numa_bitmask_isbitset(bmp, i))
CPU_SET(i, &mask);
}
numa_free_cpumask(bmp);
}
old_pthread_setaffinity_np(*thread, sizeof(mask), &mask);
VERBOSE("-> Set affinity to %d\n", core);
return ret;
}
pid_t fork(void) {
pid_t ret;
// When a new process is forked, the refcounter must be incremented
pthread_mutex_lock(&get_shm()->pin_lock);
get_shm()->refcount++;
pthread_mutex_unlock(&get_shm()->pin_lock);
ret = old_fork();
if(ret > 0) {
set_affinity(ret, get_next_core());
}
return ret;
}
int main(int argc, char const *argv[])
{
printf("S4 started\n");
get_shm();
while(1)
{
char *buf=(char*)malloc(BUF_SIZE);
int ret=read(0,buf,BUF_SIZE);
if(ret==0)
{
cnt[3]++;
break;
}
int i=0,j=strlen(buf)-2,flag=1;
while(j>i)
{
if(buf[i]!=buf[j])
{
flag=0;
break;
}
i++;
j--;
}
if(flag==0)
write(1,"It is not palindrome\n",strlen("It is not palindrome\n"));
else
write(1,"It is palindrome\n",strlen("It is palindrome\n"));
sleep(1);
}
return 0;
}
pid_t fork(void) {
pid_t ret;
// Increment refcount on fork to avoid parent dying before child and destroying the shm
__sync_fetch_and_add(&get_shm()->refcount, 1);
ret = old_fork();
if(ret > 0) {
set_affinity(ret, get_next_core());
} else if (ret < 0) {
// fork failed, decrement
__sync_fetch_and_sub(&get_shm()->refcount, 1);
}
return ret;
}
int32_t main(int32_t argc, char *argv[]) {
const int32_t SIZE = 128;
int32_t fd = get_shm(MEMORY_NAME);
if (fd < 0) {
std::cout << "Error opening shared memory\n";
exit(EXIT_FAILURE);
}
std::cout << "Truncating\n";
ftruncate(fd, SIZE);
std::cout << "Mapping to shared memory\n";
uint8_t* shared_memory = (uint8_t*)mmap(NULL, MEMORY_SIZE, PROT_WRITE|PROT_READ, MAP_SHARED, fd, 0);
std::cout << "Shared address " << (uint64_t)shared_memory << "\n";
std::cout << "Clearing memory\n";
memset(shared_memory, 0, MEMORY_SIZE);
std::cout << "About to write\n";
uint8_t cnt = 0;
while(true) {
for(int32_t index = 0; index < MEMORY_SIZE; index++) {
shared_memory[index] = cnt;
}
cnt++;
usleep (250 * 1000); // 250 ms
}
munmap(shared_memory, SIZE);
return 0;
}
/*
* do some tests on the shared memory from the Rtd image header and data
* The arguments should be the shared memory Ids.
*/
static void test_shm(int data_id, int header_id)
{
void* data = get_shm(data_id);
char* header = (char*)get_shm(header_id);
char buf[81];
int i, j, n, w, h, bitpix;
char* p;
short* rawimage;
if (header) {
printf("got image header (%d):\n", header_id);
p = header;
for(i = 0; i < 10; i++) {
for (j=0; j<80; j++) {
printf("%c", *p++);
}
printf("\n");
}
printf("...\n");
}
if (data) {
printf("got image data (%d)\n", data_id);
/* do something to the data... */
w = atoi(send_rtd("width"));
h = atoi(send_rtd("height"));
bitpix = atoi(send_rtd("bitpix"));
if (bitpix == 16) {
printf("modifying 'short' raw data (mult by 2):\n");
rawimage = (short*)data;
for(i = 0; i < w; i++) {
for (j=0; j<h; j++) {
rawimage[j*h+i] *= 2;
}
}
/* cause rtd to update the display */
send_rtd("shm update");
}
}
}
static void set_affinity(pid_t tid, int cpu_id) {
if(!get_shm()->active)
return;
if(!get_shm()->per_node) {
cpu_set_t mask;
CPU_ZERO(&mask);
CPU_SET(cpu_id, &mask);
VERBOSE("--> Setting tid %d on core %d\n", tid, cpu_id);
int r = old_sched_setaffinity(tid, sizeof(mask), &mask);
if (r < 0) {
fprintf(stderr, "couldn't set affinity on %d\n", cpu_id);
exit(1);
}
} else {
int r = numa_run_on_node(numa_node_of_cpu(cpu_id));
if(r < 0) {
fprintf(stderr, "couldn't set affinity on node of cpu %d\n", cpu_id);
exit(1);
}
}
}
static int seize_index(int index, int size, char *proc)
{
int mode = 0, key_base = 0;
print(LOG_INFO, "Seizing index %d with %s\n", index, proc);
proc_entry *entry = get_proc_at_index(index);
/* setting up ctr area for my index */
key_base = index * 4 + SEM_CTRL_KEY;
entry->key_shm = key_base + 1;
entry->key_rlock = key_base + 2;
entry->key_wlock = key_base + 3;
entry->key_active = key_base + 4;
entry->size_shm = size;
entry->sent = 0;
entry->received = 0;
my_index = index;
/* map up the cache (mem_entry) */
if ((mem_entry[index].active = create_lock(entry->key_active, 0)) == -1) {
return -1;
}
/* signal active */
if (set_active(mem_entry[index].active)) {
return -1;
}
strncpy(entry->proc_name, proc, PROC_NAME_SIZE - 1);
memcpy(mem_entry[index].proc_name, entry->proc_name, PROC_NAME_SIZE);
if ((mem_entry[index].rlock = create_lock(entry->key_rlock, 0)) == -1) {
return -1;
}
print(LOG_INFO, "Seize rlock for %s at index %d, key %d, sem %d\n",
entry->proc_name, index, entry->key_rlock,
mem_entry[index].rlock);
if ((mem_entry[index].wlock = create_lock(entry->key_wlock, 1)) == -1) {
return -1;
}
print(LOG_INFO, "Seize wlock for %s at index %d, key %d, sem %d\n",
entry->proc_name, index, entry->key_wlock,
mem_entry[index].wlock);
if ((mem_entry[index].shm =
(char *)get_shm(entry->key_shm, entry->size_shm, &mode)) == 0) {
return -1;
}
print(LOG_INFO, "Seize shm for %s at index %d, key %d, sem %p\n",
entry->proc_name, index, entry->key_shm, mem_entry[index].shm);
return 0;
}
int decpry(char *ibuf, int len)
{
struct sys_key *pskey = get_shm();
struct sys_key skey;
memcpy(&skey, pskey, sizeof(struct sys_key));
AES_KEY dec_key;
unsigned char dec_out[len];
memset(dec_out, 0, len);
AES_set_decrypt_key(skey.key, KEYLEN*8, &dec_key);
AES_cbc_encrypt(ibuf, dec_out, len, &dec_key, skey.iv_dec,
AES_DECRYPT);
memcpy(ibuf, dec_out, len);
return 0;
}
int main()
{
int size = 1000;
int shm_id = get_shm(size);
sleep(5);
char* mem = (char*)attach(shm_id);
memset(mem,'\0',size);
int index = 0;
int count = 10;
while(count--){
mem[index++] = 'A';
mem[index] = '\0';
sleep(1);
}
detach(mem);
return 0;
}
int main(int argc, char const *argv[])
{
int i;
int shm_id;
pid_t pid;
char *map_buf1;
char *map_buf2;
shm_id = get_shm(); // 创建一个共享内存段，并返回一个id标识符
pid = fork();
if(pid < 0)
{
perror("Create New Process Error");
exit(EXIT_FAILURE);
}else
if(pid == 0)
{
/*在子进程中*/
map_buf1 = at_shm(shm_id); // 将共享内存段连接到子进程中，并使map_buf1指向共享内存段
i = 0;
while(i < _SHM_SIZE_)
{
map_buf1[i] = '8';
i++;
}
map_buf1[_SHM_SIZE_-1] = '\0';
rm_shm(map_buf1); // 分离子进程与共享内存
}else
{
/*在父进程中*/
map_buf2 = at_shm(shm_id); // 将共享内存连接到父进程中，并使map_buf2指向共享内存段
sleep(5);
printf("In Parent, read Share Memory: %s\n", map_buf2);
rm_shm(map_buf2); // 分离父进程与共享内存
waitpid(pid, NULL, 0); // 等待子进程结束
delete_shm(shm_id); // 删除共享内存
}
return 0;
}
int encpry(char *ibuf, int len)
{
struct sys_key *pskey = get_shm();
struct sys_key skey;
memcpy(&skey, pskey, sizeof(struct sys_key));
AES_KEY enc_key;
const size_t encslength = len%AES_BLOCK_SIZE?
(len/AES_BLOCK_SIZE+1) * AES_BLOCK_SIZE: len;
unsigned char enc_out[encslength+1];
AES_set_encrypt_key(skey.key, KEYLEN*8, &enc_key);
AES_cbc_encrypt(ibuf, enc_out, len, &enc_key, skey.iv_enc,
AES_ENCRYPT);
memcpy(ibuf, enc_out, encslength);
ibuf[encslength] = 0;
return encslength;
}
static int lemipc_bsc(int no_team, char *path)
{
t_lemipc lemipc;
if (no_team < 1 || no_team > 255)
return (lemipc_error(NO_TEAM_ERROR));
if ((lemipc.key = ftok(path, 0)) == -1)
return (lemipc_perror(FTOK_ERROR));
lemipc.no_team = no_team;
lemipc.pos = -1;
lemipc.killed_by = 0;
lemipc.is_alone = TRUE;
lemipc.is_dead = FALSE;
if (get_shm(&lemipc) == EXIT_FAILURE ||
get_sem(&lemipc) == EXIT_FAILURE ||
get_msgq(&lemipc) == EXIT_FAILURE ||
launch_player(&lemipc) == EXIT_FAILURE)
return (EXIT_FAILURE);
return (EXIT_SUCCESS);
}
int main()
{
int _size = 1000;
int shm_id = get_shm(_size);
printf("sleep(5)\n");
sleep(5);
char* mem = (char*)attach(shm_id);
memset(mem,'\0',_size);
int index = 0;
//多进程往共享内存里面写数据，没有互斥访问共享内存，可以结合信号量机制互斥访问
int count = 60;
while(count--)
{//可以再起一个client进行写，增加挂接共享内存的数目，命令：ipcs -m查看挂接数目
mem[index] = 'X';
mem[index+1] = '\0';
index++;
sleep(1);
}
detach(mem);
printf("detach\n");
return 0;
}
static int update_cache(int index, proc_entry * entry)
{
int mode = 0;
print(LOG_INFO, "Updating cache for %s at index %d\n", entry->proc_name,
index);
if ((mem_entry[index].rlock = create_lock(entry->key_rlock, 0)) == -1) {
print(LOG_ERR, "Unable to create rlock\n");
return -1;
}
print(LOG_INFO, "Cache rlock for %s at index %d, key %d, sem %d\n",
entry->proc_name, index, entry->key_rlock,
mem_entry[index].rlock);
if ((mem_entry[index].wlock = create_lock(entry->key_wlock, 0)) == -1) {
print(LOG_ERR, "Unable to create wlock\n");
return -1;
}
print(LOG_INFO, "Cache wlock for %s at index %d, key %d, sem %d\n",
entry->proc_name, index, entry->key_wlock,
mem_entry[index].wlock);
if ((mem_entry[index].shm =
(char *)get_shm(entry->key_shm, entry->size_shm, &mode)) == 0) {
print(LOG_ERR, "Unable to map shmc\n");
return -1;
}
print(LOG_INFO, "Cache shm for %s at index %d, key %d, sem &p\n",
entry->proc_name, index, entry->key_shm, mem_entry[index].shm);
if ((mem_entry[index].active = create_lock(entry->key_active, 0)) == -1) {
print(LOG_ERR, "Unable to create active lock\n");
return -1;
}
memcpy(mem_entry[index].proc_name, entry->proc_name, PROC_NAME_SIZE);
return 0;
}
main(int argc, char *argv[]) {
char appname[128]="";
strcpy(fsthaprogname,argv[0]);
mypid=getpid();
fclose(stdin);
fclose(stdout);
fclose(stderr);
setsid();
umask(077);
if ( argc != 2 || atoi(argv[1]) < 0 || atoi(argv[1]) > 1 ) {
sprintf(msg,"Usage: %s <lh#app#>\n", argv[0]);
die(msg);
}
strcpy(appname,argv[1]);
if (get_shm(0) != 0)
die("Failed to Attach");
if ( strcmp(appname,"lh0app0") == 0 ) {
sprintf(msg,"fstastlh0app0_pid %d",mypid);
fsthahere(msg);
fstast(0,0,&(shm->lh0node),&(shm->lh0app0stat),shm->lh0app0remtest,&(shm->lh0app0remnode),shm->lh0app0test,&(shm->lh0app0testres), &(shm->lh0app0crit),shm->lh0app0name,&(shm->lh0app0testtimeo),shm->lh0app0secs,shm->lh0app0pause);
}
else if ( strcmp(appname,"lh0app1") == 0 ) {
sprintf(msg,"fstastlh0app1_pid %d",mypid);
fsthahere(msg);
fstast(0,1,&(shm->lh0node),&(shm->lh0app1stat),shm->lh0app1remtest,&(shm->lh0app1remnode),shm->lh0app1test,&(shm->lh0app1testres), &(shm->lh0app1crit),shm->lh0app1name,&(shm->lh0app1testtimeo),shm->lh0app1secs,shm->lh0app1pause);
}
else if ( strcmp(appname,"lh0app2") == 0 ) {
sprintf(msg,"fstastlh0app2_pid %d",mypid);
fsthahere(msg);
fstast(0,2,&(shm->lh0node),&(shm->lh0app2stat),shm->lh0app2remtest,&(shm->lh0app2remnode),shm->lh0app2test,&(shm->lh0app2testres), &(shm->lh0app2crit),shm->lh0app2name,&(shm->lh0app2testtimeo),shm->lh0app2secs,shm->lh0app2pause);
}
else if ( strcmp(appname,"lh0app3") == 0 ) {
sprintf(msg,"fstastlh0app3_pid %d",mypid);
fsthahere(msg);
fstast(0,3,&(shm->lh0node),&(shm->lh0app3stat),shm->lh0app0remtest,&(shm->lh0app3remnode),shm->lh0app3test,&(shm->lh0app3testres), &(shm->lh0app3crit),shm->lh0app3name,&(shm->lh0app3testtimeo),shm->lh0app3secs,shm->lh0app3pause);
}
else if ( strcmp(appname,"lh1app0") == 0 ) {
sprintf(msg,"fstastlh1app0_pid %d",mypid);
fsthahere(msg);
fstast(1,0,&(shm->lh1node),&(shm->lh1app0stat),shm->lh1app0remtest,&(shm->lh1app0remnode),shm->lh1app0test,&(shm->lh1app0testres), &(shm->lh1app0crit),shm->lh1app0name,&(shm->lh1app0testtimeo),shm->lh1app0secs,shm->lh1app0pause);
}
else if ( strcmp(appname,"lh1app1") == 0 ) {
sprintf(msg,"fstastlh1app1_pid %d",mypid);
fsthahere(msg);
fstast(1,1,&(shm->lh1node),&(shm->lh1app1stat),shm->lh1app1remtest,&(shm->lh1app1remnode),shm->lh1app1test,&(shm->lh1app1testres), &(shm->lh1app1crit),shm->lh1app1name,&(shm->lh1app1testtimeo),shm->lh1app1secs,shm->lh1app1pause);
}
else if ( strcmp(appname,"lh1app2") == 0 ) {
sprintf(msg,"fstastlh1app2_pid %d",mypid);
fsthahere(msg);
fstast(1,2,&(shm->lh1node),&(shm->lh1app2stat),shm->lh1app2remtest,&(shm->lh1app2remnode),shm->lh1app2test,&(shm->lh1app2testres), &(shm->lh1app2crit),shm->lh1app2name,&(shm->lh1app2testtimeo),shm->lh1app2secs,shm->lh1app2pause);
}
else if ( strcmp(appname,"lh1app3") == 0 ) {
sprintf(msg,"fstastlh1app3_pid %d",mypid);
fsthahere(msg);
fstast(1,3,&(shm->lh1node),&(shm->lh1app3stat),shm->lh1app3remtest,&(shm->lh1app3remnode),shm->lh1app3test,&(shm->lh1app3testres), &(shm->lh1app3crit),shm->lh1app3name,&(shm->lh1app3testtimeo),shm->lh1app3secs,shm->lh1app3pause);
}
else if ( strcmp(appname,"lh2app0") == 0 ) {
sprintf(msg,"fstastlh2app0_pid %d",mypid);
fsthahere(msg);
fstast(2,0,&(shm->lh2node),&(shm->lh2app0stat),shm->lh2app0remtest,&(shm->lh2app0remnode),shm->lh2app0test,&(shm->lh2app0testres), &(shm->lh2app0crit),shm->lh2app0name,&(shm->lh2app0testtimeo),shm->lh2app0secs,shm->lh2app0pause);
}
else if ( strcmp(appname,"lh2app1") == 0 ) {
sprintf(msg,"fstastlh2app1_pid %d",mypid);
fsthahere(msg);
fstast(2,1,&(shm->lh2node),&(shm->lh2app1stat),shm->lh2app1remtest,&(shm->lh2app1remnode),shm->lh2app1test,&(shm->lh2app1testres), &(shm->lh2app1crit),shm->lh2app1name,&(shm->lh2app1testtimeo),shm->lh2app1secs,shm->lh2app1pause);
}
else if ( strcmp(appname,"lh2app2") == 0 ) {
sprintf(msg,"fstastlh2app2_pid %d",mypid);
fsthahere(msg);
fstast(2,2,&(shm->lh2node),&(shm->lh2app2stat),shm->lh2app2remtest,&(shm->lh2app2remnode),shm->lh2app2test,&(shm->lh2app2testres), &(shm->lh2app2crit),shm->lh2app2name,&(shm->lh2app2testtimeo),shm->lh2app2secs,shm->lh2app2pause);
}
else if ( strcmp(appname,"lh2app3") == 0 ) {
sprintf(msg,"fstastlh2app3_pid %d",mypid);
fsthahere(msg);
fstast(2,3,&(shm->lh2node),&(shm->lh2app3stat),shm->lh2app3remtest,&(shm->lh2app3remnode),shm->lh2app3test,&(shm->lh2app3testres), &(shm->lh2app3crit),shm->lh2app3name,&(shm->lh2app3testtimeo),shm->lh2app3secs,shm->lh2app3pause);
}
else if ( strcmp(appname,"lh3app0") == 0 ) {
sprintf(msg,"fstastlh3app0_pid %d",mypid);
fsthahere(msg);
fstast(3,0,&(shm->lh3node),&(shm->lh3app0stat),shm->lh3app0remtest,&(shm->lh3app0remnode),shm->lh3app0test,&(shm->lh3app0testres), &(shm->lh3app0crit),shm->lh3app0name,&(shm->lh3app0testtimeo),shm->lh3app0secs,shm->lh3app0pause);
}
else if ( strcmp(appname,"lh3app1") == 0 ) {
sprintf(msg,"fstastlh3app1_pid %d",mypid);
fsthahere(msg);
fstast(3,1,&(shm->lh3node),&(shm->lh3app1stat),shm->lh3app1remtest,&(shm->lh3app1remnode),shm->lh3app1test,&(shm->lh3app1testres), &(shm->lh3app1crit),shm->lh3app1name,&(shm->lh3app1testtimeo),shm->lh3app1secs,shm->lh3app1pause);
}
else if ( strcmp(appname,"lh3app2") == 0 ) {
sprintf(msg,"fstastlh3app2_pid %d",mypid);
fsthahere(msg);
fstast(3,2,&(shm->lh3node),&(shm->lh3app2stat),shm->lh3app2remtest,&(shm->lh3app2remnode),shm->lh3app2test,&(shm->lh3app2testres), &(shm->lh3app2crit),shm->lh3app2name,&(shm->lh3app2testtimeo),shm->lh3app2secs,shm->lh3app2pause);
}
else if ( strcmp(appname,"lh3app3") == 0 ) {
sprintf(msg,"fstastlh3app3_pid %d",mypid);
fsthahere(msg);
fstast(3,3,&(shm->lh3node),&(shm->lh3app3stat),shm->lh3app3remtest,&(shm->lh3app3remnode),shm->lh3app3test,&(shm->lh3app3testres), &(shm->lh3app3crit),shm->lh3app3name,&(shm->lh3app3testtimeo),shm->lh3app3secs,shm->lh3app3pause);
}
sprintf(msg,"%s %s is Down.",basename(fsthaprogname),argv[1]);
logit(msg);
}
int
main(int argc, char *argv[])
{
struct cgi_applet *a = NULL;
struct rlimit rl;
int i;
seteuid(BBSUID);
setuid(BBSUID);
setgid(BBSGID);
cgi_time(NULL);
rl.rlim_cur = 20 * 1024 * 1024;
rl.rlim_max = 40 * 1024 * 1024;
setrlimit(RLIMIT_CORE, &rl);
thispid = getpid();
now_t = time(NULL);
srand(now_t * 2 + thispid);
wwwcache = get_shm(WWWCACHE_SHMKEY, sizeof (struct WWWCACHE));
if (NULL == wwwcache)
exit(0);
thisversion = file_time(argv[0]);
if (thisversion > wwwcache->www_version)
wwwcache->www_version = thisversion;
html_header(0);
if (geteuid() != BBSUID)
http_fatal("uid error.");
chdir(BBSHOME);
shm_init();
if (ummap())
http_fatal("mmap error.");
signal(SIGTERM, wantquit);
if (access("NOLOGIN", F_OK))
nologin = 0;
get_att_server();
while (FCGI_Accept() >= 0) {
// start_outcache();
cginame = NULL;
incgiloop = 1;
if (setjmp(cgi_start)) {
// end_outcache();
cgi_time(a);
if (!incgiloop || wwwcache->www_version > thisversion
|| rt++ > 40000) {
logtimeused();
exit(2);
}
incgiloop = 0;
continue;
}
html_header(0);
now_t = time(NULL);
via_proxy = 0;
strsncpy(fromhost, getsenv("REMOTE_ADDR"), 46); //ipv6 by leoncom
inet_pton(PF_INET6,fromhost,&from_addr);
//inet_aton(fromhost, &from_addr);
/* ipv6 by leoncom 无视validproxy
for (i = 0; wwwcache->validproxy[i] && i < MAX_PROXY_NUM; i++) {
if (from_addr.s_addr == wwwcache->validproxy[i]) {
via_proxy = 1;
break;
}
}
if (via_proxy) {
char *ptr, *p;
int IPLEN = 255;
ptr = getenv("HTTP_X_FORWARDED_FOR");
if (!ptr)
ptr = getsenv("REMOTE_ADDR");
p = strrchr(ptr, ',');
if (p != NULL) {
while (!isdigit(*p) && *p)
p++;
if (*p)
strncpy(fromhost, p, IPLEN);
else
strncpy(fromhost, ptr, IPLEN);
} else
strncpy(fromhost, ptr, IPLEN);
fromhost[IPLEN] = 0;
inet_aton(fromhost, &from_addr);
}
*/
if (url_parse())
http_fatal("%s 没有实现的功能!", getsenv("SCRIPT_URL"));
http_parm_init();
a = get_cgi_applet(needcgi);
if (a != NULL) {
cginame = a->name[0];
//access(getsenv("QUERY_STRING"), F_OK);
wwwcache->www_visit++;
(*(a->main)) ();
// end_outcache();
cgi_time(a);
if (!incgiloop || wwwcache->www_version > thisversion) {
logtimeused();
exit(4);
}
incgiloop = 0;
continue;
}
http_fatal("%s 没有实现的功能!", getsenv("SCRIPT_URL"));
// end_outcache();
incgiloop = 0;
}
munmap(ummap_ptr, ummap_size);
exit(5);
}
int main(){
int shmd, semd, fd, SHM_KEY, SEM_KEY;
SHM_KEY = ftok("makefile", 1);
SEM_KEY = ftok("makefile", 2);
shmd = shmget(SHM_KEY, sizeof(int), 0644);
semd = semget(SEM_KEY, 1, 0644);
//frankly, I don't know if the semaphore is serving / could potentially serve any purpose based on the way I wrote this
//really should get around to testing that
if(!down(semd)){
//get size of last line
int size = get_shm(shmd);
char buffer[size+1];
printf("==================\n\n");//
printf("size of buffer: %lu bytes\n\n",sizeof(buffer));
printf("buffer at creation: ");//
print(buffer,size);//
buffer[size] = '\0';
printf("buffer after terminating null added: ");//
print(buffer,size);//
//display the last line added to the file
int i;
fd = open("story.txt", O_RDWR);
i = fd;//
printf("open returns %d\n",i);//
i = lseek(fd, (-1)*size, SEEK_END);//
printf("lseek returns %d\n",i);//
i = read(fd, buffer, size);//keep this one
printf("read returns %d\n",i);//
printf("buffer after attempting to read: ");//
print(buffer,size);//
if(i == -1){
printf("read error: %s\n", strerror(errno));
}else{
printf("==================\n");//
printf("The story so far:\n");
printf("%s ...\n\n", buffer);
//printf("Cannot figure out why the above won't print out as a char array. In any case, running \"./control --remove\" will correctly print out all the contents of the file. But this is kind of driving me crazy.\n\n");
//prompt the user to add another line (max 256 characters)
printf("Add a new line (max 256 characters): ");
char new_line[256];
fgets(new_line, sizeof(new_line), stdin);
new_line[strlen(new_line) - 1] = ' ';
new_line[strlen(new_line)] = '\0';
size = strlen(new_line);
/* printf("new size (including space character): %d\n", size); */
//append the new line to the file
lseek(fd, 0, SEEK_END); //shouldn't be necessary, but read() isn't working up above so this is necessary
write(fd, new_line, size);
}
close(fd);
//update shared memory
set_shm(shmd, size);
/* print_shm(shmd); */
//release the semaphore
up(semd);
return 0;
}else{
printf("semaphore error: %s (make sure you've already run \"./control --create\")\n", strerror(errno));
return -1;
}
}
int main(int argc, char const *argv[])
{
init();
get_shm();
int ret,i;
for(i=0;i<No_of_Ports;i++)
{
sfd[i]=socket(AF_INET,SOCK_STREAM,0);
if (sfd[i]==-1)
{
printf("Socket Error : %d %d\n",i, errno);
exit(1);
}
struct sockaddr_in saddr;
memset(&saddr, 0, sizeof(struct sockaddr_in));
saddr.sin_family=AF_INET;
saddr.sin_port=htons(S[i].port);
saddr.sin_addr.s_addr=inet_addr("127.0.0.1");
int addr_len=sizeof(struct sockaddr_in);
ret=bind(sfd[i],(struct sockaddr*)&saddr,sizeof(saddr));
if (ret==-1)
{
printf("Bind Error : %d %d\n", i,errno);
exit(1);
}
ret=listen(sfd[i],S[i].listen);
if (ret==-1)
{
printf("Listen Error : %d %d\n",i, errno);
exit(1);
}
}
int caddr_len;
i=0;
printf("Port : 8889 Service :Capital to Small.\n");
printf("Port : 8888 Service :Small to Capital.\n");
printf("Port : 8887 Service :Reverse the String.\n");
printf("Port : 8886 Service :Check For palindrome.\n");
while(1)
{
if(i==0)
print_status();
struct timeval tv;
tv.tv_sec = 1;
tv.tv_usec = 0;
fd_set tr;
FD_ZERO(&tr);
FD_SET(sfd[i],&tr);
int res=select(sfd[i]+1,&tr,NULL,NULL,&tv);
if(res>0&&FD_ISSET(sfd[i],&tr))
{
struct sockaddr_in caddr;
memset(&caddr, 0, sizeof(struct sockaddr_in));
int nsfd=accept(sfd[i],(struct sockaddr*)&caddr,&caddr_len);
if(cnt[i]==0)
{
send(nsfd,"-1",strlen("-1"),0);
close(nsfd);
}
else
{
send(nsfd,"1",strlen("1"),0);
cnt[i]--;
if(nsfd==-1)
{
printf("Accept Error : %d\n", errno);
exit(1);
}
printf("Connection Accepted one more Clinet On Port Number : %d\n", S[i].port);
int c;
c=fork();
if(c==0)
{
dup2(nsfd,0);
dup2(nsfd,1);
execl(S[i].service,S[i].service,NULL);
}
else
{
//close(nsfd);
}
}
}
i=(i+1)%No_of_Ports;
}
return 0;
}
int init_memshare(char *proc_name, int size, int qsize)
{
int ctrl_mode = 1;
int retvalue = 0, index;
print(LOG_INFO, "Init_memshare start for %s with size %d\n", proc_name,
size);
if (initialized)
return 1;
/* a source proc is a must */
if (proc_name == NULL)
return 2;
memset(my_proc, 0, PROC_NAME_SIZE);
strncpy(my_proc, proc_name, PROC_NAME_SIZE - 1);
/* If I don't set a qsize I'm considered to be a send proc only */
if (size)
send_only = 0;
if (!send_only) {
init_queues();
seize_queue(&queue_index, "memshare", qsize);
}
/* clear the cache */
init_mem_proc();
/* start off by locking the ctrl lock */
if ((lock_ctrl_sem = create_lock(SEM_CTRL_KEY, 1)) == -1) {
print(LOG_ERR, "Unable to create ctrl lock\n");
return 3;
}
while (lock(lock_ctrl_sem) < 0) ;
print(LOG_DEBUG, "Ctrl locked (init) by %s, %d\n\n", proc_name,
lock_ctrl_sem);
/*print(LOG_ERR, "%d trylock (init) key=%d, sem=%d\n",
try_lock1(lock_ctrl_sem), SEM_CTRL_KEY, lock_ctrl_sem); */
/* map up the ctrl area */
if ((shm_ctrl_ptr = get_shm(SHM_CTRL_KEY, CTRL_SIZE, &ctrl_mode)) == 0) {
print(LOG_ERR, "Unable to alloc shared mem\n");
while (unlock(lock_ctrl_sem) < 0) ;
return 6;
}
if (get_index_for_proc(my_proc) != -1) {
print(LOG_ERR, "Procname %s already exists\n", my_proc);
while (unlock(lock_ctrl_sem) < 0) ;
return 4;
}
if (!send_only) {
if ((index = get_first_free()) < 0) {
while (unlock(lock_ctrl_sem) < 0) ;
print(LOG_ERR, "Max num of processes registered\n");
return 4;
}
print(LOG_DEBUG, "Next free index is %d\n", index);
retvalue = seize_index(index, size, my_proc);
if (retvalue == -1) {
while (unlock(lock_ctrl_sem) < 0) ;
return 6;
}
} else {
print(LOG_INFO, "%s is a send only proc\n", my_proc);
}
print(LOG_DEBUG, "Ctrl unlocked by %s\n\n", proc_name);
while (unlock(lock_ctrl_sem) < 0) ;
if (!send_only)
start_listen_thread();
print(LOG_DEBUG, "Init_memshare done for %s\n", my_proc);
initialized = 1;
return 0;
}