/*
This file is part of GNUnet
Copyright (C) 2002, 2003, 2004, 2005, 2006, 2011 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see .
SPDX-License-Identifier: AGPL3.0-or-later
*/
/**
* @file util/os_priority.c
* @brief Methods to set process priority
* @author Nils Durner
*/
#include "platform.h"
#include "gnunet_util_lib.h"
#include "disk.h"
#include
#define LOG(kind, ...) GNUNET_log_from (kind, "util-os-priority", __VA_ARGS__)
#define LOG_STRERROR(kind, syscall) \
GNUNET_log_from_strerror (kind, "util-os-priority", syscall)
#define LOG_STRERROR_FILE(kind, syscall, filename) \
GNUNET_log_from_strerror_file (kind, "util-os-priority", syscall, filename)
#define GNUNET_OS_CONTROL_PIPE "GNUNET_OS_CONTROL_PIPE"
struct GNUNET_OS_Process
{
/**
* PID of the process.
*/
pid_t pid;
/**
* Pipe we use to signal the process.
* NULL if unused, or if process was deemed uncontrollable.
*/
struct GNUNET_DISK_FileHandle *control_pipe;
};
/**
* Handle for 'this' process.
*/
static struct GNUNET_OS_Process current_process;
/**
* Handle for the #parent_control_handler() Task.
*/
static struct GNUNET_SCHEDULER_Task *pch;
/**
* Handle for the #shutdown_pch() Task.
*/
static struct GNUNET_SCHEDULER_Task *spch;
/**
* This handler is called on shutdown to remove the #pch.
*
* @param cls the `struct GNUNET_DISK_FileHandle` of the control pipe
*/
static void
shutdown_pch (void *cls)
{
struct GNUNET_DISK_FileHandle *control_pipe = cls;
GNUNET_SCHEDULER_cancel (pch);
pch = NULL;
GNUNET_DISK_file_close (control_pipe);
control_pipe = NULL;
}
/**
* This handler is called when there are control data to be read on the pipe
*
* @param cls the `struct GNUNET_DISK_FileHandle` of the control pipe
*/
static void
parent_control_handler (void *cls)
{
struct GNUNET_DISK_FileHandle *control_pipe = cls;
char sig;
char *pipe_fd;
ssize_t ret;
pch = NULL;
ret = GNUNET_DISK_file_read (control_pipe, &sig, sizeof(sig));
if (sizeof(sig) != ret)
{
if (-1 == ret)
LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR, "GNUNET_DISK_file_read");
LOG (GNUNET_ERROR_TYPE_DEBUG, "Closing control pipe\n");
GNUNET_DISK_file_close (control_pipe);
control_pipe = NULL;
GNUNET_SCHEDULER_cancel (spch);
spch = NULL;
return;
}
pipe_fd = getenv (GNUNET_OS_CONTROL_PIPE);
GNUNET_assert ((NULL == pipe_fd) || (strlen (pipe_fd) <= 0));
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Got control code %d from parent via pipe %s\n",
sig,
pipe_fd);
pch = GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
control_pipe,
&parent_control_handler,
control_pipe);
GNUNET_SIGNAL_raise ((int) sig);
}
/**
* Task that connects this process to its parent via pipe;
* essentially, the parent control handler will read signal numbers
* from the #GNUNET_OS_CONTROL_PIPE (as given in an environment
* variable) and raise those signals.
*
* @param cls closure (unused)
*/
void
GNUNET_OS_install_parent_control_handler (void *cls)
{
const char *env_buf;
char *env_buf_end;
struct GNUNET_DISK_FileHandle *control_pipe;
uint64_t pipe_fd;
(void) cls;
if (NULL != pch)
{
/* already done, we've been called twice... */
GNUNET_break (0);
return;
}
env_buf = getenv (GNUNET_OS_CONTROL_PIPE);
if ((NULL == env_buf) || (strlen (env_buf) <= 0))
{
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Not installing a handler because $%s is empty\n",
GNUNET_OS_CONTROL_PIPE);
putenv (GNUNET_OS_CONTROL_PIPE "=");
return;
}
errno = 0;
pipe_fd = strtoull (env_buf, &env_buf_end, 16);
if ((0 != errno) || (env_buf == env_buf_end))
{
LOG_STRERROR_FILE (GNUNET_ERROR_TYPE_WARNING, "strtoull", env_buf);
putenv (GNUNET_OS_CONTROL_PIPE "=");
return;
}
if (pipe_fd >= FD_SETSIZE)
{
LOG (GNUNET_ERROR_TYPE_ERROR,
"GNUNET_OS_CONTROL_PIPE `%s' contains garbage?\n",
env_buf);
putenv (GNUNET_OS_CONTROL_PIPE "=");
return;
}
control_pipe = GNUNET_DISK_get_handle_from_int_fd ((int) pipe_fd);
if (NULL == control_pipe)
{
LOG_STRERROR_FILE (GNUNET_ERROR_TYPE_WARNING, "open", env_buf);
putenv (GNUNET_OS_CONTROL_PIPE "=");
return;
}
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Adding parent control handler pipe `%s' to the scheduler\n",
env_buf);
pch = GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
control_pipe,
&parent_control_handler,
control_pipe);
spch = GNUNET_SCHEDULER_add_shutdown (&shutdown_pch, control_pipe);
putenv (GNUNET_OS_CONTROL_PIPE "=");
}
/**
* Get process structure for current process
*
* The pointer it returns points to static memory location and must
* not be deallocated/closed.
*
* @return pointer to the process sturcutre for this process
*/
struct GNUNET_OS_Process *
GNUNET_OS_process_current ()
{
current_process.pid = 0;
return ¤t_process;
}
/**
* Sends a signal to the process
*
* @param proc pointer to process structure
* @param sig signal
* @return 0 on success, -1 on error
*/
int
GNUNET_OS_process_kill (struct GNUNET_OS_Process *proc, int sig)
{
int ret;
char csig;
csig = (char) sig;
if (NULL != proc->control_pipe)
{
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Sending signal %d to pid: %u via pipe\n",
sig,
proc->pid);
ret = GNUNET_DISK_file_write (proc->control_pipe, &csig, sizeof(csig));
if (sizeof(csig) == ret)
return 0;
}
/* pipe failed or non-existent, try other methods */
switch (sig)
{
case SIGHUP:
case SIGINT:
case SIGKILL:
case SIGTERM:
#if (SIGTERM != GNUNET_TERM_SIG)
case GNUNET_TERM_SIG:
#endif
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Sending signal %d to pid: %u via system call\n",
sig,
proc->pid);
return kill (proc->pid, sig);
default:
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Sending signal %d to pid: %u via system call\n",
sig,
proc->pid);
return kill (proc->pid, sig);
}
}
/**
* Get the pid of the process in question
*
* @param proc the process to get the pid of
*
* @return the current process id
*/
pid_t
GNUNET_OS_process_get_pid (struct GNUNET_OS_Process *proc)
{
return proc->pid;
}
/**
* Cleans up process structure contents (OS-dependent) and deallocates
* it.
*
* @param proc pointer to process structure
*/
void
GNUNET_OS_process_destroy (struct GNUNET_OS_Process *proc)
{
if (NULL != proc->control_pipe)
GNUNET_DISK_file_close (proc->control_pipe);
GNUNET_free (proc);
}
/**
* Open '/dev/null' and make the result the given
* file descriptor.
*
* @param target_fd desired FD to point to /dev/null
* @param flags open flags (O_RDONLY, O_WRONLY)
*/
static void
open_dev_null (int target_fd, int flags)
{
int fd;
fd = open ("/dev/null", flags);
if (-1 == fd)
{
GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR, "open", "/dev/null");
return;
}
if (fd == target_fd)
return;
if (-1 == dup2 (fd, target_fd))
{
GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "dup2");
(void) close (fd);
return;
}
GNUNET_break (0 == close (fd));
}
/**
* Start a process.
*
* @param pipe_control should a pipe be used to send signals to the child?
* @param std_inheritance a set of GNUNET_OS_INHERIT_STD_* flags controlling which
* std handles of the parent are inherited by the child.
* pipe_stdin and pipe_stdout take priority over std_inheritance
* (when they are non-NULL).
* @param pipe_stdin pipe to use to send input to child process (or NULL)
* @param pipe_stdout pipe to use to get output from child process (or NULL)
* @param pipe_stderr pipe to use for stderr for child process (or NULL)
* @param lsocks array of listen sockets to dup systemd-style (or NULL);
* must be NULL on platforms where dup is not supported
* @param filename name of the binary
* @param argv NULL-terminated list of arguments to the process
* @return process ID of the new process, -1 on error
*/
static struct GNUNET_OS_Process *
start_process (int pipe_control,
enum GNUNET_OS_InheritStdioFlags std_inheritance,
struct GNUNET_DISK_PipeHandle *pipe_stdin,
struct GNUNET_DISK_PipeHandle *pipe_stdout,
struct GNUNET_DISK_PipeHandle *pipe_stderr,
const int *lsocks,
const char *filename,
char *const argv[])
{
pid_t ret;
char fds[16];
struct GNUNET_OS_Process *gnunet_proc;
struct GNUNET_DISK_FileHandle *childpipe_read;
struct GNUNET_DISK_FileHandle *childpipe_write;
int childpipe_read_fd;
int i;
int j;
int k;
int tgt;
int flags;
int *lscp;
unsigned int ls;
int fd_stdout_write;
int fd_stdout_read;
int fd_stderr_write;
int fd_stderr_read;
int fd_stdin_read;
int fd_stdin_write;
if (GNUNET_SYSERR ==
GNUNET_OS_check_helper_binary (filename, GNUNET_NO, NULL))
return NULL; /* not executable */
if (GNUNET_YES == pipe_control)
{
struct GNUNET_DISK_PipeHandle *childpipe;
int dup_childpipe_read_fd = -1;
childpipe = GNUNET_DISK_pipe (GNUNET_NO, GNUNET_NO, GNUNET_YES, GNUNET_NO);
if (NULL == childpipe)
return NULL;
childpipe_read =
GNUNET_DISK_pipe_detach_end (childpipe, GNUNET_DISK_PIPE_END_READ);
childpipe_write =
GNUNET_DISK_pipe_detach_end (childpipe, GNUNET_DISK_PIPE_END_WRITE);
GNUNET_DISK_pipe_close (childpipe);
if ((NULL == childpipe_read) || (NULL == childpipe_write) ||
(GNUNET_OK != GNUNET_DISK_internal_file_handle_ (childpipe_read,
&childpipe_read_fd,
sizeof(int))) ||
(-1 == (dup_childpipe_read_fd = dup (childpipe_read_fd))))
{
if (NULL != childpipe_read)
GNUNET_DISK_file_close (childpipe_read);
if (NULL != childpipe_write)
GNUNET_DISK_file_close (childpipe_write);
if (0 <= dup_childpipe_read_fd)
close (dup_childpipe_read_fd);
return NULL;
}
childpipe_read_fd = dup_childpipe_read_fd;
GNUNET_DISK_file_close (childpipe_read);
}
else
{
childpipe_write = NULL;
childpipe_read_fd = -1;
}
if (NULL != pipe_stdin)
{
GNUNET_assert (
GNUNET_OK ==
GNUNET_DISK_internal_file_handle_ (
GNUNET_DISK_pipe_handle (pipe_stdin, GNUNET_DISK_PIPE_END_READ),
&fd_stdin_read,
sizeof(int)));
GNUNET_assert (
GNUNET_OK ==
GNUNET_DISK_internal_file_handle_ (
GNUNET_DISK_pipe_handle (pipe_stdin, GNUNET_DISK_PIPE_END_WRITE),
&fd_stdin_write,
sizeof(int)));
}
if (NULL != pipe_stdout)
{
GNUNET_assert (
GNUNET_OK ==
GNUNET_DISK_internal_file_handle_ (
GNUNET_DISK_pipe_handle (pipe_stdout, GNUNET_DISK_PIPE_END_WRITE),
&fd_stdout_write,
sizeof(int)));
GNUNET_assert (
GNUNET_OK ==
GNUNET_DISK_internal_file_handle_ (
GNUNET_DISK_pipe_handle (pipe_stdout, GNUNET_DISK_PIPE_END_READ),
&fd_stdout_read,
sizeof(int)));
}
if (NULL != pipe_stderr)
{
GNUNET_assert (
GNUNET_OK ==
GNUNET_DISK_internal_file_handle_ (
GNUNET_DISK_pipe_handle (pipe_stderr, GNUNET_DISK_PIPE_END_READ),
&fd_stderr_read,
sizeof(int)));
GNUNET_assert (
GNUNET_OK ==
GNUNET_DISK_internal_file_handle_ (
GNUNET_DISK_pipe_handle (pipe_stderr, GNUNET_DISK_PIPE_END_WRITE),
&fd_stderr_write,
sizeof(int)));
}
lscp = NULL;
ls = 0;
if (NULL != lsocks)
{
i = 0;
while (-1 != (k = lsocks[i++]))
GNUNET_array_append (lscp, ls, k);
GNUNET_array_append (lscp, ls, -1);
}
#if DARWIN
/* see https://web.archive.org/web/20150924082249/gnunet.org/vfork */
ret = vfork ();
#else
ret = fork ();
#endif
if (-1 == ret)
{
int eno = errno;
LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR, "fork");
GNUNET_array_grow (lscp, ls, 0);
if (NULL != childpipe_write)
GNUNET_DISK_file_close (childpipe_write);
if (0 <= childpipe_read_fd)
close (childpipe_read_fd);
errno = eno;
return NULL;
}
if (0 != ret)
{
unsetenv (GNUNET_OS_CONTROL_PIPE);
gnunet_proc = GNUNET_new (struct GNUNET_OS_Process);
gnunet_proc->pid = ret;
gnunet_proc->control_pipe = childpipe_write;
if (GNUNET_YES == pipe_control)
{
close (childpipe_read_fd);
}
GNUNET_array_grow (lscp, ls, 0);
return gnunet_proc;
}
if (0 <= childpipe_read_fd)
{
char fdbuf[100];
#ifndef DARWIN
/* due to vfork, we must NOT free memory on DARWIN! */
GNUNET_DISK_file_close (childpipe_write);
#endif
snprintf (fdbuf, 100, "%x", childpipe_read_fd);
setenv (GNUNET_OS_CONTROL_PIPE, fdbuf, 1);
}
else
unsetenv (GNUNET_OS_CONTROL_PIPE);
if (NULL != pipe_stdin)
{
GNUNET_break (0 == close (fd_stdin_write));
if (-1 == dup2 (fd_stdin_read, 0))
LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR, "dup2");
GNUNET_break (0 == close (fd_stdin_read));
}
else if (0 == (std_inheritance & GNUNET_OS_INHERIT_STD_IN))
{
GNUNET_break (0 == close (0));
open_dev_null (0, O_RDONLY);
}
if (NULL != pipe_stdout)
{
GNUNET_break (0 == close (fd_stdout_read));
if (-1 == dup2 (fd_stdout_write, 1))
LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR, "dup2");
GNUNET_break (0 == close (fd_stdout_write));
}
else if (0 == (std_inheritance & GNUNET_OS_INHERIT_STD_OUT))
{
GNUNET_break (0 == close (1));
open_dev_null (1, O_WRONLY);
}
if (NULL != pipe_stderr)
{
GNUNET_break (0 == close (fd_stderr_read));
if (-1 == dup2 (fd_stderr_write, 2))
LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR, "dup2");
GNUNET_break (0 == close (fd_stderr_write));
}
else if (0 == (std_inheritance & GNUNET_OS_INHERIT_STD_ERR))
{
GNUNET_break (0 == close (2));
open_dev_null (2, O_WRONLY);
}
if (NULL != lscp)
{
/* read systemd documentation... */
i = 0;
tgt = 3;
while (-1 != lscp[i])
{
j = i + 1;
while (-1 != lscp[j])
{
if (lscp[j] == tgt)
{
/* dup away */
k = dup (lscp[j]);
GNUNET_assert (-1 != k);
GNUNET_assert (0 == close (lscp[j]));
lscp[j] = k;
break;
}
j++;
}
if (lscp[i] != tgt)
{
/* Bury any existing FD, no matter what; they should all be closed
* on exec anyway and the important onces have been dup'ed away */
(void) close (tgt);
GNUNET_assert (-1 != dup2 (lscp[i], tgt));
}
/* unset close-on-exec flag */
flags = fcntl (tgt, F_GETFD);
GNUNET_assert (flags >= 0);
flags &= ~FD_CLOEXEC;
fflush (stderr);
(void) fcntl (tgt, F_SETFD, flags);
tgt++;
i++;
}
GNUNET_snprintf (fds, sizeof(fds), "%u", i);
setenv ("LISTEN_FDS", fds, 1);
}
#ifndef DARWIN
/* due to vfork, we must NOT free memory on DARWIN! */
GNUNET_array_grow (lscp, ls, 0);
#endif
execvp (filename, argv);
LOG_STRERROR_FILE (GNUNET_ERROR_TYPE_ERROR, "execvp", filename);
_exit (1);
}
/**
* Start a process.
*
* @param pipe_control should a pipe be used to send signals to the child?
* @param std_inheritance a set of GNUNET_OS_INHERIT_STD_* flags
* @param pipe_stdin pipe to use to send input to child process (or NULL)
* @param pipe_stdout pipe to use to get output from child process (or NULL)
* @param pipe_stderr pipe to use to get output from child process (or NULL)
* @param filename name of the binary
* @param argv NULL-terminated array of arguments to the process
* @return pointer to process structure of the new process, NULL on error
*/
struct GNUNET_OS_Process *
GNUNET_OS_start_process_vap (int pipe_control,
enum GNUNET_OS_InheritStdioFlags std_inheritance,
struct GNUNET_DISK_PipeHandle *pipe_stdin,
struct GNUNET_DISK_PipeHandle *pipe_stdout,
struct GNUNET_DISK_PipeHandle *pipe_stderr,
const char *filename,
char *const argv[])
{
return start_process (pipe_control,
std_inheritance,
pipe_stdin,
pipe_stdout,
pipe_stderr,
NULL,
filename,
argv);
}
/**
* Start a process.
*
* @param pipe_control should a pipe be used to send signals to the child?
* @param std_inheritance a set of GNUNET_OS_INHERIT_STD_* flags
* @param pipe_stdin pipe to use to send input to child process (or NULL)
* @param pipe_stdout pipe to use to get output from child process (or NULL)
* @param pipe_stderr pipe to use to get output from child process (or NULL)
* @param filename name of the binary
* @param va NULL-terminated list of arguments to the process
* @return pointer to process structure of the new process, NULL on error
*/
struct GNUNET_OS_Process *
GNUNET_OS_start_process_va (int pipe_control,
enum GNUNET_OS_InheritStdioFlags std_inheritance,
struct GNUNET_DISK_PipeHandle *pipe_stdin,
struct GNUNET_DISK_PipeHandle *pipe_stdout,
struct GNUNET_DISK_PipeHandle *pipe_stderr,
const char *filename,
va_list va)
{
struct GNUNET_OS_Process *ret;
va_list ap;
char **argv;
int argc;
argc = 0;
va_copy (ap, va);
while (NULL != va_arg (ap, char *))
argc++;
va_end (ap);
argv = GNUNET_malloc (sizeof(char *) * (argc + 1));
argc = 0;
va_copy (ap, va);
while (NULL != (argv[argc] = va_arg (ap, char *)))
argc++;
va_end (ap);
ret = GNUNET_OS_start_process_vap (pipe_control,
std_inheritance,
pipe_stdin,
pipe_stdout,
pipe_stderr,
filename,
argv);
GNUNET_free (argv);
return ret;
}
/**
* Start a process.
*
* @param pipe_control should a pipe be used to send signals to the child?
* @param std_inheritance a set of GNUNET_OS_INHERIT_STD_* flags
* @param pipe_stdin pipe to use to send input to child process (or NULL)
* @param pipe_stdout pipe to use to get output from child process (or NULL)
* @param filename name of the binary
* @param ... NULL-terminated list of arguments to the process
* @return pointer to process structure of the new process, NULL on error
*/
struct GNUNET_OS_Process *
GNUNET_OS_start_process (int pipe_control,
enum GNUNET_OS_InheritStdioFlags std_inheritance,
struct GNUNET_DISK_PipeHandle *pipe_stdin,
struct GNUNET_DISK_PipeHandle *pipe_stdout,
struct GNUNET_DISK_PipeHandle *pipe_stderr,
const char *filename,
...)
{
struct GNUNET_OS_Process *ret;
va_list ap;
va_start (ap, filename);
ret = GNUNET_OS_start_process_va (pipe_control,
std_inheritance,
pipe_stdin,
pipe_stdout,
pipe_stderr,
filename,
ap);
va_end (ap);
return ret;
}
/**
* Start a process.
*
* @param pipe_control should a pipe be used to send signals to the child?
* @param std_inheritance a set of GNUNET_OS_INHERIT_STD_* flags controlling which
* std handles of the parent are inherited by the child.
* pipe_stdin and pipe_stdout take priority over std_inheritance
* (when they are non-NULL).
* @param lsocks array of listen sockets to dup systemd-style (or NULL);
* must be NULL on platforms where dup is not supported
* @param filename name of the binary
* @param argv NULL-terminated list of arguments to the process
* @return process ID of the new process, -1 on error
*/
struct GNUNET_OS_Process *
GNUNET_OS_start_process_v (int pipe_control,
enum GNUNET_OS_InheritStdioFlags std_inheritance,
const int *lsocks,
const char *filename,
char *const argv[])
{
return start_process (pipe_control,
std_inheritance,
NULL,
NULL,
NULL,
lsocks,
filename,
argv);
}
/**
* Start a process. This function is similar to the GNUNET_OS_start_process_*
* except that the filename and arguments can have whole strings which contain
* the arguments. These arguments are to be separated by spaces and are parsed
* in the order they appear. Arguments containing spaces can be used by
* quoting them with @em ".
*
* @param pipe_control should a pipe be used to send signals to the child?
* @param std_inheritance a set of GNUNET_OS_INHERIT_STD_* flags
* @param lsocks array of listen sockets to dup systemd-style (or NULL);
* must be NULL on platforms where dup is not supported
* @param filename name of the binary. It is valid to have the arguments
* in this string when they are separated by spaces.
* @param ... more arguments. Should be of type `char *`. It is valid
* to have the arguments in these strings when they are separated by
* spaces. The last argument MUST be NULL.
* @return pointer to process structure of the new process, NULL on error
*/
struct GNUNET_OS_Process *
GNUNET_OS_start_process_s (int pipe_control,
unsigned int std_inheritance,
const int *lsocks,
const char *filename,
...)
{
va_list ap;
char **argv;
unsigned int argv_size;
const char *arg;
const char *rpos;
char *pos;
char *cp;
const char *last;
struct GNUNET_OS_Process *proc;
char *binary_path;
int quote_on;
unsigned int i;
size_t len;
argv_size = 1;
va_start (ap, filename);
arg = filename;
last = NULL;
do
{
rpos = arg;
quote_on = 0;
while ('\0' != *rpos)
{
if ('"' == *rpos)
{
if (1 == quote_on)
quote_on = 0;
else
quote_on = 1;
}
if ((' ' == *rpos) && (0 == quote_on))
{
if (NULL != last)
argv_size++;
last = NULL;
rpos++;
while (' ' == *rpos)
rpos++;
}
if ((NULL == last) && ('\0' != *rpos)) // FIXME: == or !=?
last = rpos;
if ('\0' != *rpos)
rpos++;
}
if (NULL != last)
argv_size++;
}
while (NULL != (arg = (va_arg (ap, const char *))));
va_end (ap);
argv = GNUNET_malloc (argv_size * sizeof(char *));
argv_size = 0;
va_start (ap, filename);
arg = filename;
last = NULL;
do
{
cp = GNUNET_strdup (arg);
quote_on = 0;
pos = cp;
while ('\0' != *pos)
{
if ('"' == *pos)
{
if (1 == quote_on)
quote_on = 0;
else
quote_on = 1;
}
if ((' ' == *pos) && (0 == quote_on))
{
*pos = '\0';
if (NULL != last)
argv[argv_size++] = GNUNET_strdup (last);
last = NULL;
pos++;
while (' ' == *pos)
pos++;
}
if ((NULL == last) && ('\0' != *pos)) // FIXME: == or !=?
last = pos;
if ('\0' != *pos)
pos++;
}
if (NULL != last)
argv[argv_size++] = GNUNET_strdup (last);
last = NULL;
GNUNET_free (cp);
}
while (NULL != (arg = (va_arg (ap, const char *))));
va_end (ap);
argv[argv_size] = NULL;
for (i = 0; i < argv_size; i++)
{
len = strlen (argv[i]);
if ((argv[i][0] == '"') && (argv[i][len - 1] == '"'))
{
memmove (&argv[i][0], &argv[i][1], len - 2);
argv[i][len - 2] = '\0';
}
}
binary_path = argv[0];
proc = GNUNET_OS_start_process_v (pipe_control,
std_inheritance,
lsocks,
binary_path,
argv);
while (argv_size > 0)
GNUNET_free_nz (argv[--argv_size]);
GNUNET_free (argv);
return proc;
}
/**
* Retrieve the status of a process, waiting on it if dead.
* Nonblocking version.
*
* @param proc process ID
* @param type status type
* @param code return code/signal number
* @param options WNOHANG if non-blocking is desired
* @return #GNUNET_OK on success, #GNUNET_NO if the process is still running, #GNUNET_SYSERR otherwise
*/
static int
process_status (struct GNUNET_OS_Process *proc,
enum GNUNET_OS_ProcessStatusType *type,
unsigned long *code,
int options)
{
int status;
int ret;
GNUNET_assert (0 != proc);
ret = waitpid (proc->pid, &status, options);
if (ret < 0)
{
LOG_STRERROR (GNUNET_ERROR_TYPE_WARNING, "waitpid");
return GNUNET_SYSERR;
}
if (0 == ret)
{
*type = GNUNET_OS_PROCESS_RUNNING;
*code = 0;
return GNUNET_NO;
}
if (proc->pid != ret)
{
LOG_STRERROR (GNUNET_ERROR_TYPE_WARNING, "waitpid");
return GNUNET_SYSERR;
}
if (WIFEXITED (status))
{
*type = GNUNET_OS_PROCESS_EXITED;
*code = WEXITSTATUS (status);
}
else if (WIFSIGNALED (status))
{
*type = GNUNET_OS_PROCESS_SIGNALED;
*code = WTERMSIG (status);
}
else if (WIFSTOPPED (status))
{
*type = GNUNET_OS_PROCESS_SIGNALED;
*code = WSTOPSIG (status);
}
#ifdef WIFCONTINUED
else if (WIFCONTINUED (status))
{
*type = GNUNET_OS_PROCESS_RUNNING;
*code = 0;
}
#endif
else
{
*type = GNUNET_OS_PROCESS_UNKNOWN;
*code = 0;
}
return GNUNET_OK;
}
/**
* Retrieve the status of a process.
* Nonblocking version.
*
* @param proc process ID
* @param type status type
* @param code return code/signal number
* @return #GNUNET_OK on success, #GNUNET_NO if the process is still running, #GNUNET_SYSERR otherwise
*/
int
GNUNET_OS_process_status (struct GNUNET_OS_Process *proc,
enum GNUNET_OS_ProcessStatusType *type,
unsigned long *code)
{
return process_status (proc, type, code, WNOHANG);
}
/**
* Retrieve the status of a process, waiting on it if dead.
* Blocking version.
*
* @param proc pointer to process structure
* @param type status type
* @param code return code/signal number
* @return #GNUNET_OK on success, #GNUNET_SYSERR otherwise
*/
int
GNUNET_OS_process_wait_status (struct GNUNET_OS_Process *proc,
enum GNUNET_OS_ProcessStatusType *type,
unsigned long *code)
{
return process_status (proc, type, code, 0);
}
/**
* Wait for a process to terminate. The return code is discarded.
* You must not use #GNUNET_OS_process_status() on the same process
* after calling this function! This function is blocking and should
* thus only be used if the child process is known to have terminated
* or to terminate very soon.
*
* @param proc pointer to process structure
* @return #GNUNET_OK on success, #GNUNET_SYSERR otherwise
*/
int
GNUNET_OS_process_wait (struct GNUNET_OS_Process *proc)
{
pid_t pid = proc->pid;
pid_t ret;
while ((pid != (ret = waitpid (pid, NULL, 0))) && (EINTR == errno))
;
if (pid != ret)
{
LOG_STRERROR (GNUNET_ERROR_TYPE_WARNING, "waitpid");
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
/**
* Handle to a command.
*/
struct GNUNET_OS_CommandHandle
{
/**
* Process handle.
*/
struct GNUNET_OS_Process *eip;
/**
* Handle to the output pipe.
*/
struct GNUNET_DISK_PipeHandle *opipe;
/**
* Read-end of output pipe.
*/
const struct GNUNET_DISK_FileHandle *r;
/**
* Function to call on each line of output.
*/
GNUNET_OS_LineProcessor proc;
/**
* Closure for @e proc.
*/
void *proc_cls;
/**
* Buffer for the output.
*/
char buf[1024];
/**
* Task reading from pipe.
*/
struct GNUNET_SCHEDULER_Task *rtask;
/**
* When to time out.
*/
struct GNUNET_TIME_Absolute timeout;
/**
* Current read offset in buf.
*/
size_t off;
};
/**
* Stop/kill a command. Must ONLY be called either from
* the callback after 'NULL' was passed for 'line' *OR*
* from an independent task (not within the line processor).
*
* @param cmd handle to the process
*/
void
GNUNET_OS_command_stop (struct GNUNET_OS_CommandHandle *cmd)
{
if (NULL != cmd->proc)
{
GNUNET_assert (NULL != cmd->rtask);
GNUNET_SCHEDULER_cancel (cmd->rtask);
}
(void) GNUNET_OS_process_kill (cmd->eip, SIGKILL);
GNUNET_break (GNUNET_OK == GNUNET_OS_process_wait (cmd->eip));
GNUNET_OS_process_destroy (cmd->eip);
GNUNET_DISK_pipe_close (cmd->opipe);
GNUNET_free (cmd);
}
/**
* Read from the process and call the line processor.
*
* @param cls the `struct GNUNET_OS_CommandHandle *`
*/
static void
cmd_read (void *cls)
{
struct GNUNET_OS_CommandHandle *cmd = cls;
const struct GNUNET_SCHEDULER_TaskContext *tc;
GNUNET_OS_LineProcessor proc;
char *end;
ssize_t ret;
cmd->rtask = NULL;
tc = GNUNET_SCHEDULER_get_task_context ();
if (GNUNET_YES != GNUNET_NETWORK_fdset_handle_isset (tc->read_ready, cmd->r))
{
/* timeout */
proc = cmd->proc;
cmd->proc = NULL;
proc (cmd->proc_cls, NULL);
return;
}
ret = GNUNET_DISK_file_read (cmd->r,
&cmd->buf[cmd->off],
sizeof(cmd->buf) - cmd->off);
if (ret <= 0)
{
if ((cmd->off > 0) && (cmd->off < sizeof(cmd->buf)))
{
cmd->buf[cmd->off] = '\0';
cmd->proc (cmd->proc_cls, cmd->buf);
}
proc = cmd->proc;
cmd->proc = NULL;
proc (cmd->proc_cls, NULL);
return;
}
end = memchr (&cmd->buf[cmd->off], '\n', ret);
cmd->off += ret;
while (NULL != end)
{
*end = '\0';
cmd->proc (cmd->proc_cls, cmd->buf);
memmove (cmd->buf, end + 1, cmd->off - (end + 1 - cmd->buf));
cmd->off -= (end + 1 - cmd->buf);
end = memchr (cmd->buf, '\n', cmd->off);
}
cmd->rtask =
GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_absolute_get_remaining (
cmd->timeout),
cmd->r,
&cmd_read,
cmd);
}
/**
* Run the given command line and call the given function
* for each line of the output.
*
* @param proc function to call for each line of the output
* @param proc_cls closure for @a proc
* @param timeout when to time out
* @param binary command to run
* @param ... arguments to command
* @return NULL on error
*/
struct GNUNET_OS_CommandHandle *
GNUNET_OS_command_run (GNUNET_OS_LineProcessor proc,
void *proc_cls,
struct GNUNET_TIME_Relative timeout,
const char *binary,
...)
{
struct GNUNET_OS_CommandHandle *cmd;
struct GNUNET_OS_Process *eip;
struct GNUNET_DISK_PipeHandle *opipe;
va_list ap;
opipe = GNUNET_DISK_pipe (GNUNET_YES, GNUNET_YES, GNUNET_NO, GNUNET_YES);
if (NULL == opipe)
return NULL;
va_start (ap, binary);
/* redirect stdout, don't inherit stderr/stdin */
eip =
GNUNET_OS_start_process_va (GNUNET_NO, 0, NULL, opipe, NULL, binary, ap);
va_end (ap);
if (NULL == eip)
{
GNUNET_DISK_pipe_close (opipe);
return NULL;
}
GNUNET_DISK_pipe_close_end (opipe, GNUNET_DISK_PIPE_END_WRITE);
cmd = GNUNET_new (struct GNUNET_OS_CommandHandle);
cmd->timeout = GNUNET_TIME_relative_to_absolute (timeout);
cmd->eip = eip;
cmd->opipe = opipe;
cmd->proc = proc;
cmd->proc_cls = proc_cls;
cmd->r = GNUNET_DISK_pipe_handle (opipe, GNUNET_DISK_PIPE_END_READ);
cmd->rtask = GNUNET_SCHEDULER_add_read_file (timeout, cmd->r, &cmd_read, cmd);
return cmd;
}
/* end of os_priority.c */