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#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <bits/ensure.h>
#include <mlibc/ansi-sysdeps.hpp>
#include <mlibc/debug.hpp>
#include <mlibc/file-io.hpp>
#include <mlibc/posix-file-io.hpp>
#include <mlibc/posix-sysdeps.hpp>
struct popen_file : mlibc::fd_file {
popen_file(int fd, void (*do_dispose)(abstract_file *) = nullptr)
: fd_file(fd, do_dispose) {}
pid_t get_popen_pid() {
return _popen_pid;
}
void set_popen_pid(pid_t new_pid) {
_popen_pid = new_pid;
}
private:
// Underlying PID in case of popen()
pid_t _popen_pid;
};
FILE *fmemopen(void *buf, size_t size, const char *__restrict mode) {
int flags = mlibc::fd_file::parse_modestring(mode);
return frg::construct<mlibc::fmemopen_mem_file>(getAllocator(), buf, size, flags,
mlibc::file_dispose_cb<mlibc::mem_file>);
}
int pclose(FILE *stream) {
MLIBC_CHECK_OR_ENOSYS(mlibc::sys_waitpid, -1);
auto file = static_cast<popen_file *>(stream);
int status;
pid_t pid = file->get_popen_pid();
fclose(file);
if (mlibc::sys_waitpid(pid, &status, 0, NULL, &pid) != 0) {
errno = ECHILD;
return -1;
}
return status;
}
FILE *popen(const char *command, const char *typestr) {
bool is_write;
pid_t child;
FILE *ret = nullptr;
MLIBC_CHECK_OR_ENOSYS(mlibc::sys_fork && mlibc::sys_dup2 && mlibc::sys_execve &&
mlibc::sys_sigprocmask && mlibc::sys_sigaction && mlibc::sys_pipe, nullptr);
if (typestr == NULL) {
errno = EINVAL;
return nullptr;
}
if (strstr(typestr, "w") != NULL) {
is_write = true;
} else if (strstr(typestr, "r") != NULL) {
is_write = false;
} else {
errno = EINVAL;
return nullptr;
}
bool cloexec = false;
if (strstr(typestr, "e") != NULL) {
// Set FD_CLOEXEC on the new file descriptor
cloexec = true;
}
int fds[2];
if (int e = mlibc::sys_pipe(fds, 0)) {
errno = e;
return nullptr;
}
struct sigaction new_sa, old_int, old_quit;
sigset_t new_mask, old_mask;
new_sa.sa_handler = SIG_IGN;
new_sa.sa_flags = 0;
sigemptyset(&new_sa.sa_mask);
mlibc::sys_sigaction(SIGINT, &new_sa, &old_int);
mlibc::sys_sigaction(SIGQUIT, &new_sa, &old_quit);
sigemptyset(&new_mask);
sigaddset(&new_mask, SIGCHLD);
mlibc::sys_sigprocmask(SIG_BLOCK, &new_mask, &old_mask);
int parent_end = is_write ? 1 : 0;
int child_end = is_write ? 0 : 1;
if (int e = mlibc::sys_fork(&child)) {
errno = e;
mlibc::sys_close(fds[0]);
mlibc::sys_close(fds[1]);
} else if (!child) {
// For the child
mlibc::sys_sigaction(SIGINT, &old_int, nullptr);
mlibc::sys_sigaction(SIGQUIT, &old_quit, nullptr);
mlibc::sys_sigprocmask(SIG_SETMASK, &old_mask, nullptr);
mlibc::sys_close(fds[parent_end]);
if (mlibc::sys_dup2(fds[child_end], 0, is_write ? 0 : 1)) {
__ensure(!"sys_dup2() failed in popen()");
}
mlibc::sys_close(fds[child_end]);
const char *args[] = {
"sh", "-c", command, nullptr
};
mlibc::sys_execve("/bin/sh", const_cast<char **>(args), environ);
_Exit(127);
} else {
// For the parent
mlibc::sys_close(fds[child_end]);
ret = frg::construct<popen_file>(
getAllocator(),
fds[parent_end],
mlibc::file_dispose_cb<popen_file>
);
__ensure(ret);
auto file = static_cast<popen_file *>(ret);
file->set_popen_pid(child);
if (cloexec == true) {
fcntl(file->fd(), F_SETFD, O_CLOEXEC);
}
}
mlibc::sys_sigaction(SIGINT, &old_int, nullptr);
mlibc::sys_sigaction(SIGQUIT, &old_quit, nullptr);
mlibc::sys_sigprocmask(SIG_SETMASK, &old_mask, nullptr);
return ret;
}
FILE *open_memstream(char **buf, size_t *sizeloc) {
return frg::construct<mlibc::memstream_mem_file>(getAllocator(), buf, sizeloc, O_RDWR,
mlibc::file_dispose_cb<mlibc::mem_file>);
}
int fseeko(FILE *file_base, off_t offset, int whence) {
auto file = static_cast<mlibc::abstract_file *>(file_base);
if(int e = file->seek(offset, whence); e) {
errno = e;
return -1;
}
return 0;
}
off_t ftello(FILE *file_base) {
auto file = static_cast<mlibc::abstract_file *>(file_base);
off_t current_offset;
if(int e = file->tell(¤t_offset); e) {
errno = e;
return -1;
}
return current_offset;
}
int dprintf(int fd, const char *format, ...) {
va_list args;
va_start(args, format);
int result = vdprintf(fd, format, args);
va_end(args);
return result;
}
int vdprintf(int fd, const char *format, __builtin_va_list args) {
mlibc::fd_file file{fd};
int ret = vfprintf(&file, format, args);
file.flush();
return ret;
}
char *fgetln(FILE *, size_t *) {
__ensure(!"Not implemented");
__builtin_unreachable();
}
FILE *fopencookie(void *cookie, const char *__restrict mode, cookie_io_functions_t funcs) {
int flags = mlibc::fd_file::parse_modestring(mode);
return frg::construct<mlibc::cookie_file>(getAllocator(), cookie, flags, funcs,
mlibc::file_dispose_cb<mlibc::cookie_file>);
}
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