if, else, for, while, do.
+ Local variable definitions are also acceptable at the beginning of these compound statements as with any other.
|
+ Incorrect +
+ int myfunction(int a, int b)
+ {
+ int c, d;
+ c = a
+ d = b;
+
+ int e = c + d;
+
+ for (int i = 0; i < b; i++)
+ {
+ e += d;
+ }
+
+ return e / a;
+ }
+
+ |
|
+ Correct +
+ int myfunction(int a, int b)
+ {
+ int c;
+ int d;
+ int e;
+ int i;
+
+ c = a
+ d = b;
+ e = c + d;
+
+ for (i = 0; i < b; i++)
+ {
+ e += d;
+ }
+
+ return e / a;
+ }
+
+ |
diff --git a/include/signal.h b/include/signal.h index b790c8dc16..d54ded2fea 100644 --- a/include/signal.h +++ b/include/signal.h @@ -68,6 +68,62 @@ #define SIGRTMIN MIN_SIGNO /* First real time signal */ #define SIGRTMAX MAX_SIGNO /* Last real time signal */ +/* NuttX does not support standard signal actions. NuttX supports only what + * are referred to as "real time" signals. The default action of all NuttX + * signals is to simply ignore the signal. + * + * This is not POSIX compliant. Per OpenGroup.org: The following signals + * and default signal action s must be supported on all implementations: + * + * ---------- ------- ---------------------------------------------------- + * Signal Default Description + * Name Action + * ---------- ------- ---------------------------------------------------- + * SIGABRT A Process abort signal + * SIGALRM T Alarm clock + * SIGBUS A Access to an undefined portion of a memory object + * SIGCHLD I Child process terminated, stopped + * (or continued XSI extension) + * SIGCONT C Continue executing, if stopped + * SIGFPE A Erroneous arithmetic operation + * SIGHUP T Hangup + * SIGILL A Illegal instruction + * SIGINT T Terminal interrupt signal + * SIGKILL T Kill (cannot be caught or ignored) + * SIGPIPE T Write on a pipe with no one to read it + * SIGQUIT A Terminal quit signal + * SIGSEGV A Invalid memory reference + * SIGSTOP S Stop executing (cannot be caught or ignored) + * SIGTERM T Termination signal + * SIGTSTP S Terminal stop signal + * SIGTTIN S Background process attempting read + * SIGTTOU S Background process attempting write + * SIGUSR1 T User-defined signal 1 + * SIGUSR2 T User-defined signal 2 + * SIGPOLL T Poll-able event (XSI extension) + * SIGPROF T Profiling timer expired (XSI extension) + * SIGSYS A Bad system call (XSI extension) + * SIGTRAP A Trace/breakpoint trap (XSI extension) + * SIGURG I High bandwidth data is available at a socket + * SIGVTALRM T Virtual timer expired (XSI extension) + * SIGXCPU A CPU time limit exceeded (XSI extension) + * SIGXFSZ A File size limit exceeded (XSI extension) + * ---------- ------- ---------------------------------------------------- + * + * Where default action codes are: + * + * T Abnormal termination of the process. The process is terminated with + * all the consequences of _exit() except that the status made available + * to wait() and waitpid() indicates abnormal termination by the + * specified signal. + * A Abnormal termination of the process. Additionally ith the XSI + * extension, implementation-defined abnormal termination actions, such + * as creation of a core file, may occur. + * I Ignore the signal. + * S Stop the process. + * C Continue the process, if it is stopped; otherwise, ignore the signal. + */ + /* A few of the real time signals are used within the OS. They have * default values that can be overridden from the configuration file. The * rest are all user signals.