ASync Read
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/*
ASync read simple example Code by JaeHyuk Cho <mailto:minzkn@infoeq.com> */ #include <stdio.h> #include <sys/types.h> #include <unistd.h> #include <signal.h> #ifndef __USE_GNU #define __USE_GNU __USE_GNU #endif #include <fcntl.h> void DoSignalIO(int s_Signal) { fprintf(stdout, "%s : s_Signal = %d\n", __FUNCTION__, s_Signal); } int main(void) { int s_Handle; s_Handle = open("/dev/stdin", O_RDONLY); s_Handle = s_Handle == (-1) ? 0 : s_Handle; if(s_Handle != (-1)) { struct siginfo s_SignalInfo; sigset_t s_SignalSet; struct sigaction s_SignalAction; int s_Check, s_ReadBytes, s_Index, s_IsContinue, s_Prompt, s_CursorIndex; unsigned char s_Buffer[ 32 << 10 ]; char s_Cursor[] = {'-', '/', '|', '\\'}; sigemptyset(&s_SignalSet); sigaddset(&s_SignalSet, SIGRTMIN); sigprocmask(SIG_BLOCK, &s_SignalSet, (sigset_t *)0); sigemptyset(&s_SignalAction.sa_mask); s_SignalAction.sa_flags = SA_SIGINFO; s_SignalAction.sa_restorer = NULL; s_SignalAction.sa_handler = DoSignalIO; fcntl(s_Handle, F_SETFL, O_RDONLY | O_ASYNC | O_NONBLOCK); fcntl(s_Handle, F_SETSIG, SIGRTMIN); fcntl(s_Handle, F_SETOWN, getpid()); s_IsContinue = 1; if(sigaction(SIGRTMIN, &s_SignalAction, 0) != (-1)) { s_Prompt = 1; s_CursorIndex = 0; do { if(s_Prompt == 1) { fprintf(stdout, "\rInput RTS message >>> "); fflush(stdout); s_Prompt = 0; } else { fprintf(stdout, " %c\b\b", s_Cursor[((s_CursorIndex++) / 10) % sizeof(s_Cursor)]); fflush(stdout); usleep(10000); } s_Check = sigwaitinfo(&s_SignalSet, &s_SignalInfo); if(s_Check == SIGRTMIN) { if(s_SignalInfo.si_fd == s_Handle &&( (s_SignalInfo.si_code == POLL_IN) || (s_SignalInfo.si_code == SI_QUEUE) )) { s_ReadBytes = read(s_Handle, &s_Buffer[0], sizeof(s_Buffer) - 1); if(s_ReadBytes > 0) { for(s_Index = 0;s_Index < s_ReadBytes;s_Index++)fprintf(stdout, "[0x%02x]", s_Buffer[s_Index]); fprintf(stdout, "\n"); s_Prompt = 1; } } } else fprintf(stdout, "Check = %d\n", s_Check); }while(s_IsContinue == 1); } if(s_Handle > 2)close(s_Handle); } return(1); } |
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