Problem - Kevin Tafuro

SPC_PIPE *spc_popen(const char *path, char *const argv[], char *const envp[]) {
int stdin_pipe[2], stdout_pipe[2];
SPC_PIPE *p;
if (!(p = (SPC_PIPE *)malloc(sizeof(SPC_PIPE)))) return 0;
p->read_fd = p->write_fd = 0;
p->child_pid = -1;
if (pipe(stdin_pipe) = = -1) {
free(p);
return 0;
}
if (pipe(stdout_pipe) = = -1) {
close(stdin_pipe[1]);
close(stdin_pipe[0]);
free(p);
return 0;
}
if (!(p->read_fd = fdopen(stdout_pipe[0], "r"))) {
close(stdout_pipe[1]);
close(stdout_pipe[0]);
close(stdin_pipe[1]);
close(stdin_pipe[0]);
free(p);
return 0;
}
if (!(p->write_fd = fdopen(stdin_pipe[1], "w"))) {
fclose(p->read_fd);
close(stdout_pipe[1]);
close(stdin_pipe[1]);
close(stdin_pipe[0]);
free(p);
return 0;
}
if ((p->child_pid = spc_fork( )) = = -1) {
fclose(p->write_fd);
fclose(p->read_fd);
close(stdout_pipe[1]);
close(stdin_pipe[0]);
free(p);
return 0;
}
if (!p->child_pid) {
/* this is the child process */
close(stdout_pipe[0]);
close(stdin_pipe[1]);
if (stdin_pipe[0] != 0) {
dup2(stdin_pipe[0], 0);
close(stdin_pipe[0]);
}
if (stdout_pipe[1] != 1) {
32 | Chapter 1: Safe Initialization
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