One-way communication from a UNIX process to another through a pipe.

Here's what i got so far for communicate.c

#include #include #include #include #include #include #include

int main(int argc, char *argv[]) { int pfd[2]; pid_t cpid,rpid; char buf; int read_fd; int write_fd;

if (pipe(pfd) == -1) { perror("pipe"); exit(EXIT_FAILURE); }

pfd[1] = fork(); if (pfd[1] == -1) { perror("fork"); exit(EXIT_FAILURE); }

if (pfd[1] == 0) { pfd[1]= open("writer.c",O_WRONLY); dup2(pfd[1],1); close(pfd[1]); close(1); execlp("writer.c", "writer.c", NULL); }

pfd[0] = fork(); if (pfd[0] == -1) { perror("fork"); exit(EXIT_FAILURE); } if(pfd[0] == 0) { pfd[0] = open("reader.c",O_RDONLY); dup2(pfd[0],0); close(pfd[0]); close(0); execlp("reader.c", "reader.c", NULL); } close(pfd[0]); close(pfd[1]); wait(0); wait(0); return 0; }

It compiles with no errors but then when i use the UNIX command, communicate 5 (where 5 is n) it gives this:

./writer.c: line 1: /bin: Is a directory ./writer.c: line 6: syntax error near unexpected token `(' ./writer.c: line 6: `int main(int argc, char *argv[])' ./reader.c: line 1: /bin: Is a directory ./reader.c: line 6: syntax error near unexpected token `(' ./reader.c: line 6: `int main(int argc, char *argv[])'

The code for reader.c and writer.c is as follows:

/writer.c

#include #include

int main(int argc, char *argv[]) { int count; /* number of repetitions */ int i; /* loop control variable */

if (argc != 2) { printf("usage: writer count "); return -1; } else count = atoi(argv[1]);

for (i = 0; i < count; i++) { printf("Hello"); printf("hello"); } return 0; }

//reader.c

#include #define LINELENGTH 50

int main(int argc, char *argv[]) { int count; /* number of characters in the line */ int c; /* input read */

count = 0; while ((c = getchar())!= EOF) { putchar(c); count++; if (count == LINELENGTH) { putchar(' '); count = 0; } } if (count > 0) putchar(' '); return 0; }

THANKS!