GNUnet  0.19.2
os_priority.c File Reference

Methods to set process priority. More...

#include "platform.h"
#include "gnunet_util_lib.h"
#include "disk.h"
#include <unistr.h>
Include dependency graph for os_priority.c:

Go to the source code of this file.

Data Structures

struct  GNUNET_OS_Process
 
struct  GNUNET_OS_CommandHandle
 Handle to a command. More...
 

Macros

#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"
 

Functions

static void shutdown_pch (void *cls)
 This handler is called on shutdown to remove the pch. More...
 
static void parent_control_handler (void *cls)
 This handler is called when there are control data to be read on the pipe. More...
 
void GNUNET_OS_install_parent_control_handler (void *cls)
 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. More...
 
struct GNUNET_OS_ProcessGNUNET_OS_process_current ()
 Get process structure for current process. More...
 
int GNUNET_OS_process_kill (struct GNUNET_OS_Process *proc, int sig)
 Sends a signal to the process. More...
 
pid_t GNUNET_OS_process_get_pid (struct GNUNET_OS_Process *proc)
 Get the pid of the process in question. More...
 
void GNUNET_OS_process_destroy (struct GNUNET_OS_Process *proc)
 Cleans up process structure contents (OS-dependent) and deallocates it. More...
 
static void open_dev_null (int target_fd, int flags)
 Open '/dev/null' and make the result the given file descriptor. More...
 
static struct GNUNET_OS_Processstart_process (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[])
 Start a process. More...
 
struct GNUNET_OS_ProcessGNUNET_OS_start_process_vap (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[])
 Start a process. More...
 
struct GNUNET_OS_ProcessGNUNET_OS_start_process_va (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)
 Start a process. More...
 
struct GNUNET_OS_ProcessGNUNET_OS_start_process (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,...)
 Start a process. More...
 
struct GNUNET_OS_ProcessGNUNET_OS_start_process_v (enum GNUNET_OS_InheritStdioFlags std_inheritance, const int *lsocks, const char *filename, char *const argv[])
 Start a process. More...
 
struct GNUNET_OS_ProcessGNUNET_OS_start_process_s (enum GNUNET_OS_InheritStdioFlags std_inheritance, const int *lsocks, const char *filename,...)
 Start a process. More...
 
static enum GNUNET_GenericReturnValue process_status (struct GNUNET_OS_Process *proc, enum GNUNET_OS_ProcessStatusType *type, unsigned long *code, int options)
 Retrieve the status of a process, waiting on it if dead. More...
 
enum GNUNET_GenericReturnValue GNUNET_OS_process_status (struct GNUNET_OS_Process *proc, enum GNUNET_OS_ProcessStatusType *type, unsigned long *code)
 Retrieve the status of a process. More...
 
enum GNUNET_GenericReturnValue GNUNET_OS_process_wait_status (struct GNUNET_OS_Process *proc, enum GNUNET_OS_ProcessStatusType *type, unsigned long *code)
 Retrieve the status of a process, waiting on it if dead. More...
 
int GNUNET_OS_process_wait (struct GNUNET_OS_Process *proc)
 Wait for a process to terminate. More...
 
void GNUNET_OS_command_stop (struct GNUNET_OS_CommandHandle *cmd)
 Stop/kill a command. More...
 
static void cmd_read (void *cls)
 Read from the process and call the line processor. More...
 
struct GNUNET_OS_CommandHandleGNUNET_OS_command_run (GNUNET_OS_LineProcessor proc, void *proc_cls, struct GNUNET_TIME_Relative timeout, const char *binary,...)
 Run the given command line and call the given function for each line of the output. More...
 

Variables

static struct GNUNET_OS_Process current_process
 Handle for 'this' process. More...
 
static struct GNUNET_SCHEDULER_Taskpch
 Handle for the parent_control_handler() Task. More...
 
static struct GNUNET_SCHEDULER_Taskspch
 Handle for the shutdown_pch() Task. More...
 

Detailed Description

Methods to set process priority.

Author
Nils Durner

Definition in file os_priority.c.

Macro Definition Documentation

◆ LOG

#define LOG (   kind,
  ... 
)    GNUNET_log_from (kind, "util-os-priority", __VA_ARGS__)

Definition at line 33 of file os_priority.c.

◆ LOG_STRERROR

#define LOG_STRERROR (   kind,
  syscall 
)     GNUNET_log_from_strerror (kind, "util-os-priority", syscall)

Definition at line 35 of file os_priority.c.

◆ LOG_STRERROR_FILE

#define LOG_STRERROR_FILE (   kind,
  syscall,
  filename 
)     GNUNET_log_from_strerror_file (kind, "util-os-priority", syscall, filename)

Definition at line 38 of file os_priority.c.

◆ GNUNET_OS_CONTROL_PIPE

#define GNUNET_OS_CONTROL_PIPE   "GNUNET_OS_CONTROL_PIPE"

Definition at line 41 of file os_priority.c.

Function Documentation

◆ shutdown_pch()

static void shutdown_pch ( void *  cls)
static

This handler is called on shutdown to remove the pch.

Parameters
clsthe struct GNUNET_DISK_FileHandle of the control pipe

Definition at line 81 of file os_priority.c.

82 {
83  struct GNUNET_DISK_FileHandle *control_pipe = cls;
84 
86  pch = NULL;
87  GNUNET_DISK_file_close (control_pipe);
88  control_pipe = NULL;
89 }
enum GNUNET_GenericReturnValue GNUNET_DISK_file_close(struct GNUNET_DISK_FileHandle *h)
Close an open file.
Definition: disk.c:1305
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:944
static struct GNUNET_SCHEDULER_Task * pch
Handle for the parent_control_handler() Task.
Definition: os_priority.c:67
Handle used to access files (and pipes).

References GNUNET_DISK_file_close(), GNUNET_SCHEDULER_cancel(), and pch.

Referenced by GNUNET_OS_install_parent_control_handler().

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◆ parent_control_handler()

static void parent_control_handler ( void *  cls)
static

This handler is called when there are control data to be read on the pipe.

Parameters
clsthe struct GNUNET_DISK_FileHandle of the control pipe

Definition at line 98 of file os_priority.c.

99 {
100  struct GNUNET_DISK_FileHandle *control_pipe = cls;
101  char sig;
102  char *pipe_fd;
103  ssize_t ret;
104 
105  pch = NULL;
106  ret = GNUNET_DISK_file_read (control_pipe, &sig, sizeof(sig));
107  if (sizeof(sig) != ret)
108  {
109  if (-1 == ret)
110  LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR, "GNUNET_DISK_file_read");
111  LOG (GNUNET_ERROR_TYPE_DEBUG, "Closing control pipe\n");
112  GNUNET_DISK_file_close (control_pipe);
113  control_pipe = NULL;
115  spch = NULL;
116  return;
117  }
118  pipe_fd = getenv (GNUNET_OS_CONTROL_PIPE);
119  GNUNET_assert ((NULL == pipe_fd) || (strlen (pipe_fd) <= 0));
121  "Got control code %d from parent via pipe %s\n",
122  sig,
123  pipe_fd);
125  control_pipe,
127  control_pipe);
128  GNUNET_SIGNAL_raise ((int) sig);
129 }
char * getenv()
static int ret
Return value of the commandline.
Definition: gnunet-abd.c:81
ssize_t GNUNET_DISK_file_read(const struct GNUNET_DISK_FileHandle *h, void *result, size_t len)
Read the contents of a binary file into a buffer.
Definition: disk.c:621
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
@ GNUNET_ERROR_TYPE_ERROR
@ GNUNET_ERROR_TYPE_DEBUG
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_read_file(struct GNUNET_TIME_Relative delay, const struct GNUNET_DISK_FileHandle *rfd, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified delay or when the specified file descriptor is ready f...
Definition: scheduler.c:1625
void GNUNET_SIGNAL_raise(const int sig)
Raise the given signal by calling the installed signal handlers.
Definition: signal.c:98
#define GNUNET_TIME_UNIT_FOREVER_REL
Constant used to specify "forever".
#define GNUNET_OS_CONTROL_PIPE
Definition: os_priority.c:41
static void parent_control_handler(void *cls)
This handler is called when there are control data to be read on the pipe.
Definition: os_priority.c:98
static struct GNUNET_SCHEDULER_Task * spch
Handle for the shutdown_pch() Task.
Definition: os_priority.c:72
#define LOG(kind,...)
Definition: os_priority.c:33
#define LOG_STRERROR(kind, syscall)
Definition: os_priority.c:35

References getenv(), GNUNET_assert, GNUNET_DISK_file_close(), GNUNET_DISK_file_read(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_OS_CONTROL_PIPE, GNUNET_SCHEDULER_add_read_file(), GNUNET_SCHEDULER_cancel(), GNUNET_SIGNAL_raise(), GNUNET_TIME_UNIT_FOREVER_REL, LOG, LOG_STRERROR, pch, ret, and spch.

Referenced by GNUNET_OS_install_parent_control_handler().

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◆ open_dev_null()

static void open_dev_null ( int  target_fd,
int  flags 
)
static

Open '/dev/null' and make the result the given file descriptor.

Parameters
target_fddesired FD to point to /dev/null
flagsopen flags (O_RDONLY, O_WRONLY)

Definition at line 290 of file os_priority.c.

292 {
293  int fd;
294 
295  fd = open ("/dev/null", flags);
296  if (-1 == fd)
297  {
298  GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR, "open", "/dev/null");
299  return;
300  }
301  if (fd == target_fd)
302  return;
303  if (-1 == dup2 (fd, target_fd))
304  {
306  GNUNET_break (0 == close (fd));
307  return;
308  }
309  GNUNET_break (0 == close (fd));
310 }
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur.
#define GNUNET_log_strerror(level, cmd)
Log an error message at log-level 'level' that indicates a failure of the command 'cmd' with the mess...
#define GNUNET_log_strerror_file(level, cmd, filename)
Log an error message at log-level 'level' that indicates a failure of the command 'cmd' with the mess...

References GNUNET_break, GNUNET_ERROR_TYPE_ERROR, GNUNET_log_strerror, and GNUNET_log_strerror_file.

Referenced by start_process().

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◆ start_process()

static struct GNUNET_OS_Process* start_process ( 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[] 
)
static

Start a process.

Parameters
std_inheritancea 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).
pipe_stdinpipe to use to send input to child process (or NULL)
pipe_stdoutpipe to use to get output from child process (or NULL)
pipe_stderrpipe to use for stderr for child process (or NULL)
lsocksarray of listen sockets to dup systemd-style (or NULL); must be NULL on platforms where dup is not supported
filenamename of the binary
argvNULL-terminated list of arguments to the process
Returns
process ID of the new process, -1 on error

Definition at line 330 of file os_priority.c.

337 {
338  pid_t ret;
339  char fds[16];
340  struct GNUNET_OS_Process *gnunet_proc;
341  struct GNUNET_DISK_FileHandle *childpipe_read;
342  struct GNUNET_DISK_FileHandle *childpipe_write;
343  int childpipe_read_fd;
344  int i;
345  int j;
346  int k;
347  int tgt;
348  int flags;
349  int *lscp;
350  unsigned int ls;
351  int fd_stdout_write;
352  int fd_stdout_read;
353  int fd_stderr_write;
354  int fd_stderr_read;
355  int fd_stdin_read;
356  int fd_stdin_write;
357 
358  if (GNUNET_SYSERR ==
360  return NULL; /* not executable */
361  if (0 != (std_inheritance & GNUNET_OS_USE_PIPE_CONTROL))
362  {
363  struct GNUNET_DISK_PipeHandle *childpipe;
364  int dup_childpipe_read_fd = -1;
365 
367  if (NULL == childpipe)
368  return NULL;
369  childpipe_read =
371  childpipe_write =
373  GNUNET_DISK_pipe_close (childpipe);
374  if ((NULL == childpipe_read) || (NULL == childpipe_write) ||
375  (GNUNET_OK != GNUNET_DISK_internal_file_handle_ (childpipe_read,
376  &childpipe_read_fd,
377  sizeof(int))) ||
378  (-1 == (dup_childpipe_read_fd = dup (childpipe_read_fd))))
379  {
380  if (NULL != childpipe_read)
381  GNUNET_DISK_file_close (childpipe_read);
382  if (NULL != childpipe_write)
383  GNUNET_DISK_file_close (childpipe_write);
384  if (0 <= dup_childpipe_read_fd)
385  GNUNET_break (0 == close (dup_childpipe_read_fd));
386  return NULL;
387  }
388  childpipe_read_fd = dup_childpipe_read_fd;
389  GNUNET_DISK_file_close (childpipe_read);
390  }
391  else
392  {
393  childpipe_write = NULL;
394  childpipe_read_fd = -1;
395  }
396  if (NULL != pipe_stdin)
397  {
398  GNUNET_assert (
399  GNUNET_OK ==
402  &fd_stdin_read,
403  sizeof(int)));
404  GNUNET_assert (
405  GNUNET_OK ==
408  &fd_stdin_write,
409  sizeof(int)));
410  }
411  if (NULL != pipe_stdout)
412  {
413  GNUNET_assert (
414  GNUNET_OK ==
417  &fd_stdout_write,
418  sizeof(int)));
419  GNUNET_assert (
420  GNUNET_OK ==
423  &fd_stdout_read,
424  sizeof(int)));
425  }
426  if (NULL != pipe_stderr)
427  {
428  GNUNET_assert (
429  GNUNET_OK ==
432  &fd_stderr_read,
433  sizeof(int)));
434  GNUNET_assert (
435  GNUNET_OK ==
438  &fd_stderr_write,
439  sizeof(int)));
440  }
441  lscp = NULL;
442  ls = 0;
443  if (NULL != lsocks)
444  {
445  i = 0;
446  while (-1 != (k = lsocks[i++]))
447  GNUNET_array_append (lscp, ls, k);
448  GNUNET_array_append (lscp, ls, -1);
449  }
450 #if DARWIN
451  /* see https://web.archive.org/web/20150924082249/gnunet.org/vfork */
452  ret = vfork ();
453 #else
454  ret = fork ();
455 #endif
456  if (-1 == ret)
457  {
458  int eno = errno;
460  GNUNET_array_grow (lscp, ls, 0);
461  if (NULL != childpipe_write)
462  GNUNET_DISK_file_close (childpipe_write);
463  if (0 <= childpipe_read_fd)
464  GNUNET_break (0 == close (childpipe_read_fd));
465  errno = eno;
466  return NULL;
467  }
468  if (0 != ret)
469  {
470  unsetenv (GNUNET_OS_CONTROL_PIPE);
471  gnunet_proc = GNUNET_new (struct GNUNET_OS_Process);
472  gnunet_proc->pid = ret;
473  gnunet_proc->control_pipe = childpipe_write;
474  if (0 != (std_inheritance & GNUNET_OS_USE_PIPE_CONTROL))
475  {
476  GNUNET_break (0 == close (childpipe_read_fd));
477  }
478  GNUNET_array_grow (lscp, ls, 0);
479  return gnunet_proc;
480  }
481  if (0 <= childpipe_read_fd)
482  {
483  char fdbuf[100];
484 #ifndef DARWIN
485  /* due to vfork, we must NOT free memory on DARWIN! */
486  GNUNET_DISK_file_close (childpipe_write);
487 #endif
488  snprintf (fdbuf, 100, "%x", childpipe_read_fd);
489  setenv (GNUNET_OS_CONTROL_PIPE, fdbuf, 1);
490  }
491  else
492  unsetenv (GNUNET_OS_CONTROL_PIPE);
493  if (NULL != pipe_stdin)
494  {
495  GNUNET_break (0 == close (fd_stdin_write));
496  if (-1 == dup2 (fd_stdin_read, 0))
498  GNUNET_break (0 == close (fd_stdin_read));
499  }
500  else if (0 == (std_inheritance & GNUNET_OS_INHERIT_STD_IN))
501  {
502  GNUNET_break (0 == close (0));
503  open_dev_null (0, O_RDONLY);
504  }
505  if (NULL != pipe_stdout)
506  {
507  GNUNET_break (0 == close (fd_stdout_read));
508  if (-1 == dup2 (fd_stdout_write, 1))
510  GNUNET_break (0 == close (fd_stdout_write));
511  }
512  else if (0 == (std_inheritance & GNUNET_OS_INHERIT_STD_OUT))
513  {
514  GNUNET_break (0 == close (1));
515  open_dev_null (1, O_WRONLY);
516  }
517  if (NULL != pipe_stderr)
518  {
519  GNUNET_break (0 == close (fd_stderr_read));
520  if (-1 == dup2 (fd_stderr_write, 2))
522  GNUNET_break (0 == close (fd_stderr_write));
523  }
524  else if (0 == (std_inheritance & GNUNET_OS_INHERIT_STD_ERR))
525  {
526  GNUNET_break (0 == close (2));
527  open_dev_null (2, O_WRONLY);
528  }
529  if (NULL != lscp)
530  {
531  /* read systemd documentation... */
532  i = 0;
533  tgt = 3;
534  while (-1 != lscp[i])
535  {
536  j = i + 1;
537  while (-1 != lscp[j])
538  {
539  if (lscp[j] == tgt)
540  {
541  /* dup away */
542  k = dup (lscp[j]);
543  GNUNET_assert (-1 != k);
544  GNUNET_assert (0 == close (lscp[j]));
545  lscp[j] = k;
546  break;
547  }
548  j++;
549  }
550  if (lscp[i] != tgt)
551  {
552  /* Bury any existing FD, no matter what; they should all be closed
553  * on exec anyway and the important ones have been dup'ed away */
554  GNUNET_break (0 == close (tgt));
555  GNUNET_assert (-1 != dup2 (lscp[i], tgt));
556  }
557  /* unset close-on-exec flag */
558  flags = fcntl (tgt, F_GETFD);
559  GNUNET_assert (flags >= 0);
560  flags &= ~FD_CLOEXEC;
561  fflush (stderr);
562  (void) fcntl (tgt, F_SETFD, flags);
563  tgt++;
564  i++;
565  }
566  GNUNET_snprintf (fds, sizeof(fds), "%u", i);
567  setenv ("LISTEN_FDS", fds, 1);
568  }
569 #ifndef DARWIN
570  /* due to vfork, we must NOT free memory on DARWIN! */
571  GNUNET_array_grow (lscp, ls, 0);
572 #endif
573  execvp (filename, argv);
575  _exit (1);
576 }
enum GNUNET_GenericReturnValue GNUNET_DISK_internal_file_handle_(const struct GNUNET_DISK_FileHandle *fh, void *dst, size_t dst_len)
Retrieve OS file handle.
Definition: disk.c:1632
static char * filename
static struct GNUNET_NETWORK_Handle * ls
Listen socket for STUN processing.
Definition: gnunet-nat.c:85
struct GNUNET_DISK_FileHandle * GNUNET_DISK_pipe_detach_end(struct GNUNET_DISK_PipeHandle *p, enum GNUNET_DISK_PipeEnd end)
Detaches one of the ends from the pipe.
Definition: disk.c:1557
enum GNUNET_GenericReturnValue GNUNET_DISK_pipe_close(struct GNUNET_DISK_PipeHandle *p)
Closes an interprocess channel.
Definition: disk.c:1584
const struct GNUNET_DISK_FileHandle * GNUNET_DISK_pipe_handle(const struct GNUNET_DISK_PipeHandle *p, enum GNUNET_DISK_PipeEnd n)
Get the handle to a particular pipe end.
Definition: disk.c:1615
struct GNUNET_DISK_PipeHandle * GNUNET_DISK_pipe(enum GNUNET_DISK_PipeFlags pf)
Creates an interprocess channel.
Definition: disk.c:1441
@ GNUNET_DISK_PF_NONE
No special options, use non-blocking read/write operations.
@ GNUNET_DISK_PIPE_END_WRITE
The writing-end of a pipe.
@ GNUNET_DISK_PIPE_END_READ
The reading-end of a pipe.
@ GNUNET_OK
@ GNUNET_NO
@ GNUNET_SYSERR
#define GNUNET_array_grow(arr, size, tsize)
Grow a well-typed (!) array.
int GNUNET_snprintf(char *buf, size_t size, const char *format,...) __attribute__((format(printf
Like snprintf, just aborts if the buffer is of insufficient size.
#define GNUNET_new(type)
Allocate a struct or union of the given type.
#define GNUNET_array_append(arr, len, element)
Append an element to an array (growing the array by one).
enum GNUNET_GenericReturnValue GNUNET_OS_check_helper_binary(const char *binary, bool check_suid, const char *params)
Check whether an executable exists and possibly if the suid bit is set on the file.
@ GNUNET_OS_INHERIT_STD_IN
When this flag is set, the child process will inherit stdin of the parent.
Definition: gnunet_os_lib.h:83
@ GNUNET_OS_INHERIT_STD_OUT
When this flag is set, the child process will inherit stdout of the parent.
Definition: gnunet_os_lib.h:89
@ GNUNET_OS_INHERIT_STD_ERR
When this flag is set, the child process will inherit stderr of the parent.
Definition: gnunet_os_lib.h:95
@ GNUNET_OS_USE_PIPE_CONTROL
Should a pipe be used to send signals to the child?
#define LOG_STRERROR_FILE(kind, syscall, filename)
Definition: os_priority.c:38
static void open_dev_null(int target_fd, int flags)
Open '/dev/null' and make the result the given file descriptor.
Definition: os_priority.c:290
Handle used to manage a pipe.
Definition: disk.c:68
pid_t pid
PID of the process.
Definition: os_priority.c:49
struct GNUNET_DISK_FileHandle * control_pipe
Pipe we use to signal the process.
Definition: os_priority.c:55

References GNUNET_OS_Process::control_pipe, filename, GNUNET_array_append, GNUNET_array_grow, GNUNET_assert, GNUNET_break, GNUNET_DISK_file_close(), GNUNET_DISK_internal_file_handle_(), GNUNET_DISK_PF_NONE, GNUNET_DISK_pipe(), GNUNET_DISK_pipe_close(), GNUNET_DISK_pipe_detach_end(), GNUNET_DISK_PIPE_END_READ, GNUNET_DISK_PIPE_END_WRITE, GNUNET_DISK_pipe_handle(), GNUNET_ERROR_TYPE_ERROR, GNUNET_new, GNUNET_NO, GNUNET_OK, GNUNET_OS_check_helper_binary(), GNUNET_OS_CONTROL_PIPE, GNUNET_OS_INHERIT_STD_ERR, GNUNET_OS_INHERIT_STD_IN, GNUNET_OS_INHERIT_STD_OUT, GNUNET_OS_USE_PIPE_CONTROL, GNUNET_snprintf(), GNUNET_SYSERR, LOG_STRERROR, LOG_STRERROR_FILE, ls, open_dev_null(), GNUNET_OS_Process::pid, and ret.

Referenced by GNUNET_OS_start_process_v(), and GNUNET_OS_start_process_vap().

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◆ process_status()

static enum GNUNET_GenericReturnValue process_status ( struct GNUNET_OS_Process proc,
enum GNUNET_OS_ProcessStatusType type,
unsigned long *  code,
int  options 
)
static

Retrieve the status of a process, waiting on it if dead.

Nonblocking version.

Parameters
procprocess ID
typestatus type
codereturn code/signal number
optionsWNOHANG if non-blocking is desired
Returns
GNUNET_OK on success, GNUNET_NO if the process is still running, GNUNET_SYSERR otherwise

Definition at line 702 of file os_priority.c.

837 {
838  int status;
839  int ret;
840 
841  GNUNET_assert (0 != proc);
842  ret = waitpid (proc->pid,
843  &status,
844  options);
845  if (ret < 0)
846  {
848  "waitpid");
849  return GNUNET_SYSERR;
850  }
851  if (0 == ret)
852  {
854  *code = 0;
855  return GNUNET_NO;
856  }
857  if (proc->pid != ret)
858  {
860  "waitpid");
861  return GNUNET_SYSERR;
862  }
863  if (WIFEXITED (status))
864  {
866  *code = WEXITSTATUS (status);
867  }
868  else if (WIFSIGNALED (status))
869  {
871  *code = WTERMSIG (status);
872  }
873  else if (WIFSTOPPED (status))
874  {
876  *code = WSTOPSIG (status);
877  }
878 #ifdef WIFCONTINUED
879  else if (WIFCONTINUED (status))
880  {
882  *code = 0;
883  }
884 #endif
885  else
886  {
888  *code = 0;
889  }
890 
891  return GNUNET_OK;
892 }
struct GNUNET_GETOPT_CommandLineOption options[]
Definition: 002.c:5
uint16_t status
See PRISM_STATUS_*-constants.
@ GNUNET_ERROR_TYPE_WARNING
@ GNUNET_OS_PROCESS_SIGNALED
The process was killed by a signal.
@ GNUNET_OS_PROCESS_EXITED
The process exited with a return code.
@ GNUNET_OS_PROCESS_UNKNOWN
The process is not known to the OS (or at least not one of our children).
@ GNUNET_OS_PROCESS_RUNNING
The process is still running.
enum GNUNET_TESTBED_UnderlayLinkModelType type
the type of this model

◆ cmd_read()

static void cmd_read ( void *  cls)
static

Read from the process and call the line processor.

Parameters
clsthe struct GNUNET_OS_CommandHandle *

Definition at line 1039 of file os_priority.c.

1040 {
1041  struct GNUNET_OS_CommandHandle *cmd = cls;
1042  const struct GNUNET_SCHEDULER_TaskContext *tc;
1044  char *end;
1045  ssize_t ret;
1046 
1047  cmd->rtask = NULL;
1050  {
1051  /* timeout */
1052  proc = cmd->proc;
1053  cmd->proc = NULL;
1054  proc (cmd->proc_cls, NULL);
1055  return;
1056  }
1057  ret = GNUNET_DISK_file_read (cmd->r,
1058  &cmd->buf[cmd->off],
1059  sizeof(cmd->buf) - cmd->off);
1060  if (ret <= 0)
1061  {
1062  if ((cmd->off > 0) && (cmd->off < sizeof(cmd->buf)))
1063  {
1064  cmd->buf[cmd->off] = '\0';
1065  cmd->proc (cmd->proc_cls, cmd->buf);
1066  }
1067  proc = cmd->proc;
1068  cmd->proc = NULL;
1069  proc (cmd->proc_cls, NULL);
1070  return;
1071  }
1072  end = memchr (&cmd->buf[cmd->off], '\n', ret);
1073  cmd->off += ret;
1074  while (NULL != end)
1075  {
1076  *end = '\0';
1077  cmd->proc (cmd->proc_cls, cmd->buf);
1078  memmove (cmd->buf, end + 1, cmd->off - (end + 1 - cmd->buf));
1079  cmd->off -= (end + 1 - cmd->buf);
1080  end = memchr (cmd->buf, '\n', cmd->off);
1081  }
1082  cmd->rtask =
1084  cmd->timeout),
1085  cmd->r,
1086  &cmd_read,
1087  cmd);
1088 }
static int end
Set if we are to shutdown all services (including ARM).
Definition: gnunet-arm.c:34
@ GNUNET_YES
int GNUNET_NETWORK_fdset_handle_isset(const struct GNUNET_NETWORK_FDSet *fds, const struct GNUNET_DISK_FileHandle *h)
Check if a file handle is part of an fd set.
Definition: network.c:1128
void(* GNUNET_OS_LineProcessor)(void *cls, const char *line)
Type of a function to process a line of output.
const struct GNUNET_SCHEDULER_TaskContext * GNUNET_SCHEDULER_get_task_context(void)
Obtain the reasoning why the current task was started.
Definition: scheduler.c:724
struct GNUNET_TIME_Relative GNUNET_TIME_absolute_get_remaining(struct GNUNET_TIME_Absolute future)
Given a timestamp in the future, how much time remains until then?
Definition: time.c:405
static void cmd_read(void *cls)
Read from the process and call the line processor.
Definition: os_priority.c:1039
static struct GNUNET_SCHEDULER_TaskContext tc
Task context of the current task.
Definition: scheduler.c:424
Handle to a command.
Definition: os_priority.c:962
size_t off
Current read offset in buf.
Definition: os_priority.c:1006
char buf[1024]
Buffer for the output.
Definition: os_priority.c:991
struct GNUNET_SCHEDULER_Task * rtask
Task reading from pipe.
Definition: os_priority.c:996
struct GNUNET_TIME_Absolute timeout
When to time out.
Definition: os_priority.c:1001
void * proc_cls
Closure for proc.
Definition: os_priority.c:986
GNUNET_OS_LineProcessor proc
Function to call on each line of output.
Definition: os_priority.c:981
const struct GNUNET_DISK_FileHandle * r
Read-end of output pipe.
Definition: os_priority.c:976
Context information passed to each scheduler task.
const struct GNUNET_NETWORK_FDSet * read_ready
Set of file descriptors ready for reading; note that additional bits may be set that were not in the ...

References GNUNET_OS_CommandHandle::buf, end, GNUNET_DISK_file_read(), GNUNET_NETWORK_fdset_handle_isset(), GNUNET_SCHEDULER_add_read_file(), GNUNET_SCHEDULER_get_task_context(), GNUNET_TIME_absolute_get_remaining(), GNUNET_YES, GNUNET_OS_CommandHandle::off, GNUNET_OS_CommandHandle::proc, GNUNET_OS_CommandHandle::proc_cls, GNUNET_OS_CommandHandle::r, GNUNET_SCHEDULER_TaskContext::read_ready, ret, GNUNET_OS_CommandHandle::rtask, tc, and GNUNET_OS_CommandHandle::timeout.

Referenced by GNUNET_OS_command_run().

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Variable Documentation

◆ current_process

struct GNUNET_OS_Process current_process
static

Handle for 'this' process.

Definition at line 1 of file os_priority.c.

Referenced by GNUNET_OS_process_current().

◆ pch

◆ spch

struct GNUNET_SCHEDULER_Task* spch
static

Handle for the shutdown_pch() Task.

Definition at line 72 of file os_priority.c.

Referenced by GNUNET_OS_install_parent_control_handler(), and parent_control_handler().