void _popen_noshell_child_process(
/* We need the pointer *arg_ptr only to free whatever we reference if exec() fails and we were fork()'ed (thus memory was copied),
* not clone()'d */
struct popen_noshell_clone_arg *arg_ptr, /* NULL if we were called by pure fork() (not because of Valgrind) */
int pipefd_0, int pipefd_1, int read_pipe, int ignore_stderr, const char *file, const char * const *argv) {
int closed_child_fd;
int closed_pipe_fd;
int dupped_child_fd;
int pipefd[2] = {pipefd_0, pipefd_1};
if (ignore_stderr) { /* ignore STDERR completely? */
if (popen_noshell_reopen_fd_to_dev_null(STDERR_FILENO) != 0) _ERR(255, "popen_noshell_reopen_fd_to_dev_null(%d)", STDERR_FILENO);
}
if (read_pipe) {
closed_child_fd = STDIN_FILENO; /* re-open STDIN to /dev/null */
closed_pipe_fd = 0; /* close read end of pipe */
dupped_child_fd = STDOUT_FILENO; /* dup the other pipe end to STDOUT */
} else {
closed_child_fd = STDOUT_FILENO; /* ignore STDOUT completely */
closed_pipe_fd = 1; /* close write end of pipe */
dupped_child_fd = STDIN_FILENO; /* dup the other pipe end to STDIN */
}
if (popen_noshell_reopen_fd_to_dev_null(closed_child_fd) != 0) {
_ERR(255, "popen_noshell_reopen_fd_to_dev_null(%d)", closed_child_fd);
}
if (_popen_noshell_close_and_dup(pipefd, closed_pipe_fd, dupped_child_fd) != 0) {
_ERR(255, "_popen_noshell_close_and_dup(%d ,%d)", closed_pipe_fd, dupped_child_fd);
}
execvp(file, (char * const *)argv);
/* if we are here, exec() failed */
warn("exec(\"%s\") inside the child", file);
#ifdef POPEN_NOSHELL_VALGRIND_DEBUG
if (arg_ptr) { /* not NULL if we were called by clone() */
/* but Valgrind does not support clone(), so we were actually called by fork(), thus memory was copied... */
/* free this copied memory; if it was not Valgrind, this memory would have been shared and would belong to the parent! */
_pclose_noshell_free_clone_arg_memory(arg_ptr);
}
#endif
if (fflush(stdout) != 0) _ERR(255, "fflush(stdout)");
if (fflush(stderr) != 0) _ERR(255, "fflush(stderr)");
close(STDIN_FILENO);
close(STDOUT_FILENO);
close(STDERR_FILENO);
_exit(255); // call _exit() and not exit(), or you'll have troubles in C++
}
static void popen_noshell_child_process(
int pipefd_0, int pipefd_1,
int read_pipe, int ignore_stderr,
const char *file, const char * const *argv) {
int closed_child_fd;
int closed_pipe_fd;
int dupped_child_fd;
int pipefd[2] = {pipefd_0, pipefd_1};
if (ignore_stderr) { /* ignore STDERR completely? */
if (popen_noshell_reopen_fd_to_dev_null(STDERR_FILENO) != 0) _ERR(255, "popen_noshell_reopen_fd_to_dev_null(%d)", STDERR_FILENO);
}
if (read_pipe) {
closed_child_fd = STDIN_FILENO; /* re-open STDIN to /dev/null */
closed_pipe_fd = 0; /* close read end of pipe */
dupped_child_fd = STDOUT_FILENO; /* dup the other pipe end to STDOUT */
} else {
closed_child_fd = STDOUT_FILENO; /* ignore STDOUT completely */
closed_pipe_fd = 1; /* close write end of pipe */
dupped_child_fd = STDIN_FILENO; /* dup the other pipe end to STDIN */
}
if (popen_noshell_reopen_fd_to_dev_null(closed_child_fd) != 0) {
_ERR(255, "popen_noshell_reopen_fd_to_dev_null(%d)", closed_child_fd);
}
if (popen_noshell_close_and_dup(pipefd, closed_pipe_fd, dupped_child_fd) != 0) {
_ERR(255, "popen_noshell_close_and_dup(%d ,%d)", closed_pipe_fd, dupped_child_fd);
}
execvp(file, (char * const *)argv);
/* if we are here, exec() failed */
warn("exec(\"%s\") inside the child", file);
if (fflush(stdout) != 0) _ERR(255, "fflush(stdout)");
if (fflush(stderr) != 0) _ERR(255, "fflush(stderr)");
close(STDIN_FILENO);
close(STDOUT_FILENO);
close(STDERR_FILENO);
_exit(255); // call _exit() and not exit(), or you'll have troubles in C++
}
