int main()
{
int fd = 0;
int pid = 0;
char buf[10] = {0};
if ((fd = open("fd_in_fork_test.c", O_RDONLY)) < 0)
{
failure("open failed");
}
read(fd, buf, 10);
printpos("Before fork", fd);
if ((pid = fork()) < 0)
{
failure("fork failed");
}
else if (0 == pid)
{
printpos("Child before read", fd);
read(fd, buf, 10);
printpos("Child after read", fd);
}
else
{
wait(NULL);
printpos("Parent after wait", fd);
}
close(fd);
return 0;
}
main()
{
int fd;
int pid;
char buf[10];
if((fd=open("data",O_RDONLY))<0)
{
failure("open failed");
}
read(fd,buf,10);
printpos("Before fork",fd);
if((pid=fork())<0)
{
failure("fork failed");
}
else if(!pid)
{
printpos("Child before read",fd);
read(fd,buf,10);
printpos("child after read",fd);
}
else
{
wait(NULL);
printpos("parent after wait",fd);
}
}
int gofor(int llen, int rlen, int turn, int forward) {
encoderReset(r_encoder);
encoderReset(l_encoder);
int ol=0;
int or=0;
dstat=0;
printf("going for %d\t%d degrees with dir %d\t%d\n\r",llen,rlen,turn,forward);
#ifndef SIM
while((abs(encoderGet(l_encoder))<llen &&abs(encoderGet(r_encoder))<rlen)){
c_status("gofor",llen);
controldrive(turn,forward);
simtank(<ank,encoderGet(l_encoder-ol)-ol,encoderGet(r_encoder)-or);
ol=encoderGet(l_encoder);
or=encoderGet(r_encoder);
delay(20);
}
#endif
dstat=1;
controldrive(0,0);
printf("Motion complete, expected:");
printpos(&ctank);
printf("\tintegrated: ");
printpos(<ank);
printf("\n\r");
return encoderGet(l_encoder)>encoderGet(l_encoder) ? encoderGet(l_encoder) : encoderGet(r_encoder);
}
main()
{
int fd; /* 文件描述符 */
int pid;/* 进程标识符 */
char buf[10]; /* 数据缓冲区 */
/* 打开文件 */
if ((fd=open("data",O_RDONLY))<0)
failure("open failed");
read(fd,buf,10); /* advance file pointer */
printpos("Before fork",fd);
/* fork 新进程 */
if ((pid=fork())<0)
failure("fork failed");
else if (!pid)
/* 子进程 */
printpos("Child before read",fd);
read(fd,buf,10);
printpos("child after read",fd);
else {
void
errorposf(SrcPos *p, char *fmt, ...)
{
va_list va;
va_start(va, fmt);
vfprintf(stderr, fmt, va);
va_end(va);
fprintf(stderr, " at %s:%d:%d\n", p->file, p->line, p->col);
printpos(p);
exit(1);
}
int main(int argc, char **argv){
int i;
char *p;
GC_INIT();
::cgc1::cgc_root_t hash_bucket_root(hash_buckets);
hash_buckets=reinterpret_cast<node*>(::cgc1::cgc_malloc(sizeof(node)*7313));
progname = BaseName(argv[0]);
yyinit();
for (p=argv[0]; *p; p++) if (*p=='/') progname = p+1;
for (i=1; i<argc; i++) {
if (EQUAL == strcmp(argv[i],"--help")) {
usage();
exit(0);
}
if (EQUAL == strcmp(argv[i],"-dep")) {
stop_after_dep = TRUE;
continue;
}
if (EQUAL == strcmp(argv[i],"-cxx")) {
do_cxx = TRUE;
continue;
}
if (EQUAL == strcmp(argv[i],"-noline")) {
noline = TRUE;
continue;
}
if (EQUAL == strcmp(argv[i],"-pthreadlocal")) {
pthreadThreadLocal=TRUE;
compilerThreadLocal=FALSE;
continue;
}
if (EQUAL == strcmp(argv[i],"-typecodes")) {
printtypecodes();
return 0;
}
if (EQUAL == strcmp(argv[i],"-noarraychks")) {
arraychks = FALSE;
continue;
}
if (EQUAL == strcmp(argv[i],"-nocasechks")) {
casechks = FALSE;
continue;
}
if (EQUAL == strcmp(argv[i],"-nomacros")) {
nomacros = TRUE;
continue;
}
if (EQUAL == strcmp(argv[i],"-O")) {
arraychks = FALSE;
casechks = FALSE;
continue;
}
if (EQUAL == strcmp(argv[i],"-tabwidth")) {
i++;
if (i < argc) tabwidth = atoi(argv[i]);
continue;
}
if (EQUAL == strcmp(argv[i],"-yydebug")) {
yydebug = 1;
continue;
}
if (EQUAL == strcmp(argv[i],"-debug")) {
debug = TRUE;
continue;
}
if (EQUAL == strcmp(argv[i],"-v")) {
puts(Version);
puts(Copyright);
continue;
}
if ('-' == argv[i][0] && 'I' == argv[i][1]) {
if (argv[i][2] == 0) {
error("-I option: missing directory");
usage();
exit(1);
}
char buf[256];
strcpy(buf,sigpath);
strcat(buf,":");
strcat(buf,argv[i]+2);
sigpath = strperm(buf);
continue;
}
if ('-' == argv[i][0]) {
error("unrecognized option %s\n",argv[i]);
usage();
exit(1);
}
if ( EQUAL == strcmp(".d",tail(argv[i])) || EQUAL == strcmp(".dd",tail(argv[i])) ) {
node f;
do_this_cxx = do_cxx || EQUAL == strcmp(".dd",tail(argv[i]));
global_scope = new(struct SCOPE);
readsetup(global_scope);
targetname = newsuffixbase(argv[i],"");
f = readfile(argv[i]);
if (debug) {
char *n = newsuffixbase(argv[i],".out");
if (NULL == freopen(n,"w", stdout)) {
fatal("can't open file %s",n);
}
put("After parsing:\n");
pp(f);
fflush(stdout);
}
outfilename = newsuffixbase(argv[i], do_this_cxx ? "-tmp.cc" : "-tmp.c");
{
char *n = newsuffixbase(argv[i],".dep.tmp");
dependfile = fopen(n,"w");
if (dependfile == NULL) fatal("can't open file %s",n);
}
f = chkprogram(f);
if (debug) {
char *n = newsuffixbase(argv[i],".log");
if (NULL == freopen(n,"w", stdout)) {
fatal("can't open file %s",n);
}
pprintl(f);
}
{
node t = global_scope->signature;
char *n = newsuffixbase(argv[i],".sig.tmp");
if (NULL == freopen(n,"w", stdout)) {
fatal("can't open file %s",n);
}
printf("-- generated by %s\n\n",progname);
while (t != NULL) {
dprint(CAR(t));
put(";\n");
t = CDR(t);
}
}
if (stop_after_dep) quit();
checkfordeferredsymbols();
if (debug) {
char *n = newsuffixbase(argv[i],".sym");
if (NULL == freopen(n,"w", stdout)) {
fatal("can't open file %s",n);
}
printsymboltable();
printtypelist();
printstringlist();
}
if (n_errors > 0) {
quit();
}
if (TRUE) {
char *n = newsuffixbase(argv[i],"-exports.h.tmp");
if (NULL == freopen(n,"w", stdout)) {
fatal("can't open file %s",n);
}
printf("#ifndef %s_included\n",targetname);
printf("#define %s_included\n",targetname);
declarationsstrings = reverse(declarationsstrings);
while (declarationsstrings) {
node s = unpos(car(declarationsstrings));
assert(isstrconst(s));
put_unescape(s->body.string_const.characters);
put("\n");
declarationsstrings = cdr(declarationsstrings);
}
put(declarations_header);
/* printtypecodes(); */
cprinttypes();
put(declarations_trailer);
put("#endif\n");
}
if (TRUE) {
if (NULL == freopen(outfilename,"w", stdout)) {
fatal("can't open file %s",outfilename);
}
printf("#include \"%s\"\n",newsuffixbase(argv[i],"-exports.h"));
put(code_header);
headerstrings = reverse(headerstrings);
while (headerstrings) {
locn(car(headerstrings));
printpos();
node s = unpos(car(headerstrings));
assert(isstrconst(s));
put_unescape(s->body.string_const.characters);
put("\n");
locn(NULL);
headerstrings = cdr(headerstrings);
}
cprintsemi(f);
}
}
else {
fprintf(stderr,"unknown file type %s\n",argv[i]);
usage();
exit(1);
}
}
quit();
return 0;
}
