Arduino Sound Demo
0 likes • Jan 4, 2022
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#include <stdio.h>#include <string.h>#include <unistd.h>#define READ 0 /* The index of the read end of the pipe */#define WRITE 1 /* The index of the write end of the pipe */char * phrase = "This goes in the pipe";int main() {int fd[2], bytesRead;char message[100]; /* Parent process' message buffer */pipe(fd); /* Create unnamed pipe */if (fork() == 0) /* Child, writer */ {close(fd[READ]); /* Close unused end */write(fd[WRITE], phrase, strlen(phrase) + 1); /* Include NULL */close(fd[WRITE]); /* Close used end */} else /* Parent, reader */ {close(fd[WRITE]); /* Close unused end */bytesRead = read(fd[READ], message, 100);printf("Parent just read %i bytes: %s\n", bytesRead, message);close(fd[READ]); /* Close used end */}}
#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <sys/types.h>#include <sys/wait.h>int main() {char * cmd[] = {"who","ls","date"};int i;while (1) {printf("0=who 1=ls 2=date : ");scanf("%d", & i);if (fork() == 0) {/* child */execlp(cmd[i], cmd[i], (char * ) 0);printf("execlp failed\n");exit(1);} else {/* parent */wait((int * ) 0);printf("child finished\n");}} /* while */} /* main */
// The following code is the fast inverse square root implementation from Quake III Arena// this code has been stripped of C preprocessor directives, but includes the exact original comment textfloat Q_rsqrt( float number ){long i;float x2, y;const float threehalfs = 1.5F;x2 = number * 0.5F;y = number;i = * ( long * ) &y; // evil floating point bit level hackingi = 0x5f3759df - ( i >> 1 ); // what the fuck?y = * ( float * ) &i;y = y * ( threehalfs - ( x2 * y * y ) ); // 1st iteration// y = y * ( threehalfs - ( x2 * y * y ) ); // 2nd iteration, this can be removedreturn y;}
#include <stdio.h>#include <sys/types.h>#include <unistd.h>int main() {pid_t pid; /* could be int */int i;pid = fork();printf("PID=%d\n", pid);if (pid > 0) {/* parent */for (i = 0; i < 10; i++)printf("\t\t\tPARENT %d\n", i);} else {/* child */for (i = 0; i < 10; i++)printf("CHILD %d\n", i);}return 0;}
#include <stdio.h>#include <unistd.h>int main() {char * cmd[] = {"who","ls","date"};int i;printf("0=who 1=ls 2=date : ");scanf("%d", & i);execlp(cmd[i], cmd[i], (char * ) 0);printf("execlp failed\n");return 0;}
#include <stdio.h>#include <sys/types.h>#include <unistd.h>int glbvar = 6;int main() {int locvar = 88;pid_t pid;printf("Before fork()\n");if ((pid = fork()) == 0) {/* child */glbvar++;locvar++;} else if (pid > 0) {/* parent */sleep(2);} elseperror("fork error");printf("pid=%d, glbvar=%d, locvar=%d\n", getpid(), glbvar, locvar);return 0;} /* end main */