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crucible: remove unused execpipe

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Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell 2017-01-08 23:14:16 -05:00
parent 4a9f26d12e
commit cf04fb17de
5 changed files with 0 additions and 194 deletions
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28
include/crucible/execpipe.h
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@ -1,28 +0,0 @@
#ifndef CRUCIBLE_EXECPIPE_H
#define CRUCIBLE_EXECPIPE_H
#include "crucible/fd.h"
#include <functional>
#include <limits>
#include <string>
namespace crucible {
using namespace std;
void redirect_stdin(const Fd &child_fd);
void redirect_stdin_stdout(const Fd &child_fd);
void redirect_stdin_stdout_stderr(const Fd &child_fd);
void redirect_stdout(const Fd &child_fd);
void redirect_stdout_stderr(const Fd &child_fd);
// Open a pipe (actually socketpair) to child process, then execute code in that process.
// e.g. popen([] () { system("echo Hello, World!"); });
// Forked process will exit when function returns.
Fd popen(function<int()> f, function<void(const Fd &child_fd)> import_fd_fn = redirect_stdin_stdout);
// Read all the data from fd into a string
string read_all(Fd fd, size_t max_bytes = numeric_limits<size_t>::max(), size_t chunk_bytes = 4096);
};
#endif // CRUCIBLE_EXECPIPE_H

1
lib/Makefile
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@ -4,7 +4,6 @@ OBJS = \
crc64.o \
chatter.o \
error.o \
execpipe.o \
extentwalker.o \
fd.o \
fs.o \

100
lib/execpipe.cc
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@ -1,100 +0,0 @@
#include "crucible/execpipe.h"
#include "crucible/chatter.h"
#include "crucible/error.h"
#include "crucible/process.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <unistd.h>
namespace crucible {
using namespace std;
void
redirect_stdin(const Fd &child_fd)
{
dup2_or_die(child_fd, STDIN_FILENO);
}
void
redirect_stdin_stdout(const Fd &child_fd)
{
dup2_or_die(child_fd, STDOUT_FILENO);
dup2_or_die(child_fd, STDIN_FILENO);
}
void
redirect_stdin_stdout_stderr(const Fd &child_fd)
{
dup2_or_die(child_fd, STDERR_FILENO);
dup2_or_die(child_fd, STDOUT_FILENO);
dup2_or_die(child_fd, STDIN_FILENO);
}
void
redirect_stdout_stderr(const Fd &child_fd)
{
dup2_or_die(child_fd, STDERR_FILENO);
dup2_or_die(child_fd, STDOUT_FILENO);
}
void
redirect_stdout(const Fd &child_fd)
{
dup2_or_die(child_fd, STDOUT_FILENO);
}
void
redirect_stderr(const Fd &child_fd)
{
dup2_or_die(child_fd, STDERR_FILENO);
}
Fd popen(function<int()> f, function<void(const Fd &child_fd)> import_fd_fn)
{
Fd parent_fd, child_fd;
{
pair<Fd, Fd> fd_pair = socketpair_or_die();
parent_fd = fd_pair.first;
child_fd = fd_pair.second;
}
pid_t fv;
DIE_IF_MINUS_ONE(fv = fork());
if (fv) {
child_fd->close();
return parent_fd;
} else {
int rv = EXIT_FAILURE;
catch_all([&]() {
parent_fd->close();
import_fd_fn(child_fd);
rv = f();
});
_exit(rv);
}
}
string
read_all(Fd fd, size_t max_bytes, size_t chunk_bytes)
{
char buf[chunk_bytes];
string str;
size_t rv;
while (1) {
read_partial_or_die(fd, static_cast<void *>(buf), chunk_bytes, rv);
if (rv == 0) {
break;
}
if (max_bytes - str.size() < rv) {
THROW_ERROR(out_of_range, "Output size limit " << max_bytes << " exceeded by appending " << rv << " bytes read to " << str.size() << " already in string");
}
str.append(buf, rv);
}
return str;
}
}

1
test/Makefile
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@ -1,7 +1,6 @@
PROGRAMS = \
chatter \
crc64 \
execpipe \
fd \
limits \
path \

64
test/execpipe.cc
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@ -1,64 +0,0 @@
#include "tests.h"
#include "crucible/execpipe.h"
#include <ios>
#include <cassert>
#include <cstring>
#include <cstdlib>
#include <stdexcept>
#include <unistd.h>
using namespace crucible;
using namespace std;
#if 1 // Needs rework
static inline
void
test_hello_world()
{
// alarm(9);
Fd fd = popen([]() { return system("echo Hello, World!"); });
char buf[1024];
size_t rv = -1;
read_partial_or_die(fd, buf, rv);
assert(rv > 0);
string b(buf, buf + rv - 1);
// cerr << "hello_world says: '" << b << "'" << endl;
assert(b == "Hello, World!");
}
static inline
void
test_read_limit(size_t limit = 4096)
{
alarm(9);
Fd fd = popen([]() { return system("yes Hello!"); });
try {
string b = read_all(fd, limit);
} catch (out_of_range &re) {
return;
}
assert(!"no exception thrown by read_all");
}
#endif
namespace crucible {
extern bool assert_no_leaked_fds();
};
int
main(int, char**)
{
#if 1
RUN_A_TEST(test_hello_world());
assert(assert_no_leaked_fds());
RUN_A_TEST(test_read_limit(4095));
RUN_A_TEST(test_read_limit(4096));
RUN_A_TEST(test_read_limit(4097));
assert(assert_no_leaked_fds());
#endif
exit(EXIT_SUCCESS);
}