struct sigaction不完整的错误

虽然包含<signal.h>我得到一个错误,说明struct sigaction是一个不完整的types。

我不知道该怎么办。

请帮忙

 #include <signal.h> struct sigaction act; int main(int argc, char** argv) { int depth; /* validate arguments number*/ if(argc < 2) { printf("fatal error: please use arguments <MaxChild> <MaxDepth>\n"); exit(1); } /* register the realtime signal handler for sigchld*/ /*173*/ memset(&act,0,sizeof(act)); act.sa_handler = sigproc; sigaction(SIGCHLD, /* signal number whose action will be changed */ &act, /* new action to do when SIGCHLD arrives*/ NULL); /* old action - not stored */ srand(time(NULL)); depth = rand() % atoi(argv[2]); /* [0 maxDepth]*/ RecursiveFunc(atoi(argv[1]), depth); return 0; } 

错误消息:

 proc.c: In function 'main': proc.c:173:22: error: invalid application of 'sizeof' to incomplete type 'struct sigaction' proc.c:174:2: error: invalid use of undefined type 'struct sigaction' cc1: warnings being treated as errors proc.c:175:2: error: implicit declaration of function 'sigaction' 

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