Technical Information

• DCE in a Nutshell

Limitations

• Currently the POSIX API (libc) is not fully supported by DCE. However there are already about 400 methods supported. As the goal of DCE is to allow to execute network applications, many methods related to the network are supported for example socket, connect, bind, listen, read, write, poll, select. The next chapter list the applications well tested using DCE.
• Some methods are not usable with all options of DCE. For more details refer to chapter Coverage API that lists all the supported methods.
• The scheduler is not as advanced as that of a kernel, for example if an infinite loop in a hosted application, DCE can not get out, but this should not happen in applications written correctly.

API Coverage

Below there is the list of the systems calls supported by DCE, the column named Type represents how the system call is implemented ie:

1. DCE the method is fully rewritten,
2. NATIVE the real corresponding system call is used.

API Coverage

System Call Name	Domain	Include file	Type	Remarks
gettimeofday	Date & Time	sys/time.h	DCE
time	Date & Time	time.h	DCE
asctime, ctime, gmtime, localtime	Date & Time	time.h	DCE
asctime_r, ctime_r, gmtime_r, localtime_r, mktime, strftime	Date & Time	time.h	NATIVE
clock_gettime	Date & Time	time.h	NATIVE	Should not be NATIVE, do not use for now.
read	IO	unistd.h	DCE
write	IO	unistd.h	DCE
writev	IO	sys/uio.h	DCE
clearerr	IO	stdio.h	DCE
setbuf, setbuffer, setlinebuf, setvbuf	IO	stdio.h	DCE
fseek, ftell, rewind, fgetpos, fsetpos	IO	stdio.h	DCE
printf	IO	stdio.h	DCE
fprintf	IO	stdio.h	NATIVE
sprintf, snprintf	IO	stdio.h	NATIVE
asprintf, vasprintf	IO	stdio.h	NATIVE
dprintf, vdprintf	IO	stdio.h	NATIVE
fgetc, fgetc_unlocked	IO	stdio.h	DCE
getc, getc_unlocked	IO	stdio.h	NATIVE
getchar, getchar_unlocked	IO	stdio.h	DCE
_IO_getc	IO	stdio.h	DCE
fputc, fputc_unlocked	IO	stdio.h	DCE
putc, putc_unlocked	IO	stdio.h	NATIVE
putchar, putchar_unlocked	IO	stdio.h	DCE
_IO_putc	IO	stdio.h	DCE
fgets, fgets_unlocked	IO	stdio.h	DCE
fputs, fputs_unlocked	IO	stdio.h	DCE
puts	IO	stdio.h	DCE
ungetc	IO	stdio.h	DCE
fclose	IO	stdio.h	DCE
fcloseall	IO	stdio.h	DCE
fopen, fdopen64, fdopen, freopen	IO	stdio.h	DCE
fflush, fflush_unlocked	IO	stdio.h	DCE
fread, fread_unlocked	IO	stdio.h	DCE
fwrite, fwrite_unlocked	IO	stdio.h	DCE
ferror, ferror_unlocked	IO	stdio.h	DCE
feof, feof_unlocked	IO	stdio.h	DCE
fileno, fileno_unlocked	IO	stdio.h	DCE
perror	IO	stdlib.h	DCE
vprintf	IO	stdarg.h	DCE
vfprintf, vsprintf, vsnprintf	IO	stdarg.h	NATIVE
fcntl	IO	fcntl.h	DCE
dup, dup2	IO	unistd.h	DCE
open, open64	IO	fcntl.h	DCE
close	IO	unistd.h	DCE
unlink	IO	unistd.h	DCE
remove	IO	stdio.h	DCE
mkdir	IO	sys/stat.h	DCE
rmdir	IO	unistd.h	DCE
select	IO	unistd.h	DCE
isatty	IO	unistd.h	DCE
ioctl	IO	sys/ioctl.h	DCE
poll	IO	poll.h	DCE
getcwd, getwd, get_current_dir_name	IO	unistd.h	DCE
chdir, fchdir	IO	unistd.h	DCE
alphasort, alphasort64, versionsort	IO	dirent.h	NATIVE
umask	IO	sys/stat.h	DCE
truncate, ftruncate	IO	unistd.h	DCE
ttyname	IO	unistd.h	DCE
lseek	IO	unistd.h	DCE
euidaccess, eaccess	IO	unistd.h	DCE
pathconf	IO	unistd.h	NATIVE
getpwnam, getpwuid, endpwent	IO	pwd.h	DCE
opendir, fdopendir	IO	dirent.h	DCE
readdir, readdir_r	IO	dirent.h	DCE
closedir	IO	dirent.h	DCE
dirfd	IO	dirent.h	DCE
rewinddir	IO	dirent.h	DCE
scandir	IO	dirent.h	DCE
unlinkat	IO	fcntl.h	DCE
pread, pwrite	IO	unistd.h	DCE
uname	Kernel	sys/utsname.h	DCE
sysconf	Kernel	unistd.h	NATIVE
calloc, malloc, free, realloc	Memory Allocation	stdlib.h	DCE
mmap, mmap64, munmap	Memory Mappings	sys/map.h	DCE
htonl	Networking	arpa/inet.h	NATIVE
htons	Networking	arpa/inet.h	NATIVE
ntohl	Networking	arpa/inet.h	NATIVE
htonl	Networking	arpa/inet.h	NATIVE
ntohs	Networking	arpa/inet.h	NATIVE
socket	Networking	sys/socket.h	DCE	Not all flavour are supported pleaselook at the doxygen doc.
getsockname	Networking	sys/socket.h	DCE
getpeername	Networking	sys/socket.h	DCE
bind	Networking	sys/socket.h	DCE
connect	Networking	sys/socket.h	DCE
inet_aton, inet_addr, inet_network, inet_ntoa, inet_makeaddr, inet_lnaof, inet_netof	Networking	arpa/inet.h	NATIVE
inet_ntop	Networking	arpa/inet.h	DCE
inet_pton	Networking	arpa/inet.h	NATIVE
getsockopt, setsockopt	Networking	sys/socket.h	DCE
listen	Networking	sys/socket.h	DCE
accept	Networking	sys/socket.h	DCE
shutdown	Networking	sys/socket.h	DCE
send, sendto, sendmsg	Networking	sys/socket.h	DCE
recv, recvfrom, recvmsg	Networking	sys/socket.h	DCE
gethostbyname, gethostbyname2	Networking	netdb.h	DCE
getaddrinfo, freeaddrinfo, gai_strerror	Networking	netdb.h	DCE
gethostent, sethostent, endhostset, hstrerror	Networking	netdb.h	NATIVE
herror	Networking	netdb.h	DCE
getprotoent, getprotobyname, getprotonumber, setprotoent, endprotoent	Networking	netdb.h	NATIVE
getservent, getservbyname, getservbyport, setservent, endservent	Networking	netdb.h	NATIVE
if_nametoindex	Networking	net/if.h	DCE
getnameinfo	Networking	sys/socket.h	DCE
ether_aton_r	Networking	netinet/ether.h	NATIVE
atexit	Process	stdlib.h	DCE
getpid, getppid	Process	unistd.h	DCE
getuid, geteuid	Process	unistd.h	DCE
setuid	Process	unistd.h	DCE
setgid	Process	unistd.h	DCE
seteuid, setegid	Process	unistd.h	DCE
setreuid, setregid	Process	unistd.h	DCE
setresuid, setresgid	Process	unistd.h	DCE
sched_yield	Process	sched.h	DCE
exit	Process	unistd.h	DCE
getenv	Process	stdlib.h	DCE
putenv	Process	stdlib.h	DCE
setenv, unsetenv	Process	stdlib.h	DCE
clearenv	Process	stdlib.h	DCE
fork	Process	unistd.h	DCE	Supported only with the Cooja Loader.
abort	Process	stdlib.h	DCE
execl, execlp, execle, execv, execvp, execve	Process	unistd.h	DCE	Supported only with the pthread fiber manager.
wait, waitpid	Process	sys/wait.h	DCE
sbrk	Process	unistd.h	DCE
getpagesize	Process	unistd.h	DCE
getgid, getegid	Process	unistd.h	DCE
gethostname	Process	unistd.h	DCE
getpgrp	Process	unistd.h	DCE
pipe	Process	unistd.h	DCE
__sigsetjmp, siglongjmp	Process	setjmp.h	NATIVE	Experimental, please do not use them.
getdtablesize	Process	unistd.h	NATIVE
random, srandom	Random	stdlib.h	DCE
rand, srand	Random	stdlib.h	DCE
drand48, erand48, lrand48, nrand48, mrand48, jrand48, srand48, seed48, lcong48	Random	stdlib.h	DCE
drand48_r, erand48_r, lrand48_r, nrand48_r, mrand48_r, jrand48_r, srand48_r, seed48_r, lcong48_r	Random	stdlib.h	DCE
signal	Signal	signal.h	DCE
sigaction	Signal	signal.h	DCE
sigemptyset, sigfillset, sigaddset, sigdelset, sigismember	Signal	signal.h	NATIVE
sigprocmask	Signal	signal.h	DCE
qsort	Sort	stdlib.h	NATIVE
strerror, strerror_h	String	string.h	NATIVE
setlocale	String	locale.h	DCE	Do nothing at all
strcoll	String	string.h	NATIVE
uselocale	String	locale.h	NATIVE
newlocale	String	locale.h	NATIVE
wctob	String	wchar.h	NATIVE
btowc	String	wchar.h	NATIVE
memset	String	string.h	NATIVE
memcpy	String	string.h	NATIVE
bcopy	String	string.h	NATIVE
memcmp	String	string.h	NATIVE
memmove	String	string.h	NATIVE
memchr	String	string.h	NATIVE
strcpy, strncpy	String	string.h	NATIVE
strcat, strncat	String	string.h	NATIVE
strcmp, strncmp	String	string.h	NATIVE
strlen, strnlen	String	string.h	NATIVE
strspn, strcspn	String	string.h	NATIVE
strchr, strrchr	String	string.h	NATIVE
strcasecmp, strncasecmp	String	string.h	NATIVE
strdup, strndup	String	string.h	DCE
getopt, getopt_long	String	unistd.h	DCE
atoi, atol, atoll, atof	String	stdlib.h	NATIVE
strtol, strtoll	String	stdlib.h	DCE
strtoul, strtoull	String	stdlib.h	DCE
strtod	String	stdlib.h	DCE
toupper, tolower	String	ctype.h	NATIVE
index, rindex	String	strings.h	NATIVE
strtok, strtok_r	String	string.h	NATIVE
sscanf	String	stdio.h	NATIVE
basename, dirname	String	libgen.h	NATIVE
bindtextdomain, textdomain, gettext	String	libintl.h	NATIVE
mbrlen	String	wchar.h	NATIVE
strtoimax, strtoumax	String	inttypes.h	NATIVE
openlog, syslog, closelog, vsyslog, setlogmask	Syslog	syslog.h	DCE
pthread_create	Thread	pthread.h	DCE
pthread_exit	Thread	pthread.h	DCE
pthread_self	Thread	pthread.h	DCE
pthread_once	Thread	pthread.h	DCE
pthread_getspecific, pthread_setspecific	Thread	pthread.h	DCE
pthread_key_create	Thread	pthread.h	DCE
pthread_key_delete	Thread	pthread.h	DCE
pthread_mutex_destroy, pthread_mutex_init	Thread	pthread.h	DCE
pthread_mutex_lock, pthread_mutex_trylock, pthread_mutex_unlock	Thread	pthread.h	DCE
pthread_mutexattr_destroy, pthread_mutexattr_init	Thread	pthread.h	DCE
pthread_mutexattr_settype	Thread	pthread.h	DCE
pthread_cancel	Thread	pthread.h	DCE
pthread_kill	Thread	pthread.h	DCE
pthread_join	Thread	pthread.h	DCE
pthread_detach	Thread	pthread.h	DCE
pthread_cond_destroy, pthread_cond_init	Thread	pthread.h	DCE
pthread_cond_broadcast, pthread_cond_signal	Thread	pthread.h	DCE
pthread_cond_timedwait, pthread_cond_wait	Thread	pthread.h	DCE
pthread_condattr_destroy, pthread_condattr_init	Thread	pthread.h	DCE
sem_init	Thread Synchronization	semaphore.h	DCE
sem_destroy	Thread Synchronization	semaphore.h	DCE
sem_post	Thread Synchronization	semaphore.h	DCE
sem_wait, sem_trywait, sem_timedwait	Thread Synchronization	semaphore.h	DCE
sem_getvalue	Thread Synchronization	semaphore.h	DCE
sleep, usleep	Timer	unistd.h	DCE
nanosleep	Timer	time.h	DCE
getitimer, setitimer	Timer	sys/time.h	DCE
timerfd_create, timerfd_settime, timerfd_gettime	Timer	sys/timerfd.h	DCE
getgrnam	Users & Groups	grp.h	NATIVE
getrusage	Users & Groups	sys/resource.h	NATIVE