linux 创建进程

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#include <unistd.h>#include <sys/types.h>#include <sys/wait.h>#include <stdio.h>#include <stdlib.h>#include <errno.h>#include <math.h>/* 进程创建 */void main(void){pid_t child;int status;printf("This will demostrate how to get child status\n");/* 创建子进程 */if((child=fork())==-1){printf("Fork Error : %s\n", strerror(errno));exit(1);}else if(child==0) // 子进程{int i;printf("I am the child: %s\n", getpid());for(i=0;i<1000000;i++) sin(i);i=5;printf("I exit with %d\n", i);exit(i);}while(((child=wait(&status))==-1)&(errno==EINTR));  //子进程未结束if(child==-1)printf("Wait Error: %s\n", strerror(errno));else if(!status)             // 子进程退出值为0printf("Child %ld terminated normally return status is zero\n", child);else if(WIFEXITED(status))   // 子进程退出值0printf("Child %ld terminated normally return status is %d\n", child, WEXITSTATUS(status));else if(WIFSIGNALED(status)) // 子进程未获信号而退出printf("Chlid %ld terminated due to signal %d not caught\n", child, WTERMSIG(status));}

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