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#pragma once
#include <errno.h>
#include <gc.h>
#include <poll.h>
#include <pthread.h>
#include <signal.h>
#include <spawn.h>
#include <stdbool.h>
#include <stdint.h>
#include <sys/param.h>
#include <sys/wait.h>
#include <unistd.h>
#define READ_END 0
#define WRITE_END 1
public int run_command(Text_t exe, Array_t arg_array, Table_t env_table,
Array_t input_bytes, Array_t *output_bytes, Array_t *error_bytes)
{
pthread_testcancel();
struct sigaction sa = { .sa_handler = SIG_IGN }, oldint, oldquit;
sigaction(SIGINT, &sa, &oldint);
sigaction(SIGQUIT, &sa, &oldquit);
sigaddset(&sa.sa_mask, SIGCHLD);
sigset_t old, reset;
sigprocmask(SIG_BLOCK, &sa.sa_mask, &old);
sigemptyset(&reset);
if (oldint.sa_handler != SIG_IGN) sigaddset(&reset, SIGINT);
if (oldquit.sa_handler != SIG_IGN) sigaddset(&reset, SIGQUIT);
posix_spawnattr_t attr;
posix_spawnattr_init(&attr);
posix_spawnattr_setsigmask(&attr, &old);
posix_spawnattr_setsigdefault(&attr, &reset);
posix_spawnattr_setflags(&attr, POSIX_SPAWN_SETSIGDEF|POSIX_SPAWN_SETSIGMASK);
int child_inpipe[2], child_outpipe[2], child_errpipe[2];
pipe(child_inpipe);
pipe(child_outpipe);
pipe(child_errpipe);
posix_spawn_file_actions_t actions;
posix_spawn_file_actions_init(&actions);
posix_spawn_file_actions_adddup2(&actions, child_inpipe[READ_END], STDIN_FILENO);
posix_spawn_file_actions_addclose(&actions, child_inpipe[WRITE_END]);
posix_spawn_file_actions_adddup2(&actions, child_outpipe[WRITE_END], STDOUT_FILENO);
posix_spawn_file_actions_addclose(&actions, child_outpipe[READ_END]);
posix_spawn_file_actions_adddup2(&actions, child_errpipe[WRITE_END], STDERR_FILENO);
posix_spawn_file_actions_addclose(&actions, child_errpipe[READ_END]);
const char *exe_str = Text$as_c_string(exe);
Array_t arg_strs = {};
Array$insert_value(&arg_strs, exe_str, I(0), sizeof(char*));
for (int64_t i = 0; i < arg_array.length; i++)
Array$insert_value(&arg_strs, Text$as_c_string(*(Text_t*)(arg_array.data + i*arg_array.stride)), I(0), sizeof(char*));
Array$insert_value(&arg_strs, NULL, I(0), sizeof(char*));
char **args = arg_strs.data;
extern char **environ;
char **env = environ;
if (env_table.entries.length > 0) {
Array_t env_array = {}; // Array of const char*
for (char **e = environ; *e; e++)
Array$insert(&env_array, e, I(0), sizeof(char*));
for (int64_t i = 0; i < env_table.entries.length; i++) {
struct { Text_t key, value; } *entry = env_table.entries.data + env_table.entries.stride*i;
const char *env_entry = heap_strf("%k=%k", &entry->key, &entry->value);
Array$insert(&env_array, &env_entry, I(0), sizeof(char*));
}
Array$insert_value(&env_array, NULL, I(0), sizeof(char*));
assert(env_array.stride == sizeof(char*));
env = env_array.data;
}
pid_t pid;
int ret = exe_str[0] == '/' ?
posix_spawn(&pid, exe_str, &actions, &attr, args, env)
: posix_spawnp(&pid, exe_str, &actions, &attr, args, env);
if (ret != 0)
return -1;
posix_spawnattr_destroy(&attr);
posix_spawn_file_actions_destroy(&actions);
close(child_inpipe[READ_END]);
close(child_outpipe[WRITE_END]);
close(child_errpipe[WRITE_END]);
struct pollfd pollfds[3] = {
{.fd=child_inpipe[WRITE_END], .events=POLLOUT},
{.fd=child_outpipe[WRITE_END], .events=POLLIN},
{.fd=child_errpipe[WRITE_END], .events=POLLIN},
};
if (input_bytes.length > 0 && input_bytes.stride != 1)
Array$compact(&input_bytes, sizeof(char));
if (output_bytes)
*output_bytes = (Array_t){.atomic=1, .stride=1, .length=0};
if (error_bytes)
*error_bytes = (Array_t){.atomic=1, .stride=1, .length=0};
for (;;) {
(void)poll(pollfds, sizeof(pollfds)/sizeof(pollfds[0]), -1); // Wait for data or readiness
bool did_something = false;
if (pollfds[0].revents) {
if (input_bytes.length > 0) {
ssize_t written = write(child_inpipe[WRITE_END], input_bytes.data, (size_t)input_bytes.length);
if (written > 0) {
input_bytes.data += written;
input_bytes.length -= (int64_t)written;
did_something = true;
} else if (written < 0) {
close(child_inpipe[WRITE_END]);
pollfds[0].events = 0;
}
}
if (input_bytes.length <= 0) {
close(child_inpipe[WRITE_END]);
pollfds[0].events = 0;
}
}
char buf[256];
if (pollfds[1].revents) {
ssize_t n = read(child_outpipe[READ_END], buf, sizeof(buf));
did_something = did_something || (n > 0);
if (n <= 0) {
close(child_outpipe[READ_END]);
pollfds[1].events = 0;
} else if (n > 0 && output_bytes) {
if (output_bytes->free < n) {
output_bytes->data = GC_REALLOC(output_bytes->data, (size_t)(output_bytes->length + n));
output_bytes->free = 0;
}
memcpy(output_bytes->data + output_bytes->length, buf, (size_t)n);
output_bytes->length += n;
}
}
if (pollfds[2].revents) {
ssize_t n = read(child_errpipe[READ_END], buf, sizeof(buf));
did_something = did_something || (n > 0);
if (n <= 0) {
close(child_errpipe[READ_END]);
pollfds[2].events = 0;
} else if (n > 0 && error_bytes) {
if (error_bytes->free < n) {
error_bytes->data = GC_REALLOC(error_bytes->data, (size_t)(error_bytes->length + n));
error_bytes->free = 0;
}
memcpy(error_bytes->data + error_bytes->length, buf, (size_t)n);
error_bytes->length += n;
}
}
if (!did_something) break;
}
int status = 0;
if (ret == 0) {
while (waitpid(pid, &status, 0) < 0 && errno == EINTR) {
if (WIFEXITED(status) || WIFSIGNALED(status))
break;
else if (WIFSTOPPED(status))
kill(pid, SIGCONT);
}
}
sigaction(SIGINT, &oldint, NULL);
sigaction(SIGQUIT, &oldquit, NULL);
sigprocmask(SIG_SETMASK, &old, NULL);
if (ret) errno = ret;
return status;
}
#undef READ_END
#undef WRITE_END
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