rpm  5.2.1
Data Structures | Defines | Functions | Variables
rpmio/rpmsq.c File Reference
#include "system.h"
#include <signal.h>
#include <sys/signal.h>
#include <sys/wait.h>
#include <search.h>
#include <rpmsq.h>
#include "debug.h"
Include dependency graph for rpmsq.c:

Go to the source code of this file.

Data Structures

struct  rpmsig_s

Defines

#define DO_LOCK()   (0)
#define DO_UNLOCK()   (0)
#define INIT_LOCK()
#define ADD_REF(__tbl)   /*@-noeffect@*/ (0)
#define SUB_REF(__tbl)   /*@-noeffect@*/ (0)
#define CLEANUP_HANDLER(__handler, __arg, __oldtypeptr)
#define CLEANUP_RESET(__execute, __oldtype)
#define SAME_THREAD(_a, _b)   (42)
#define ME()   __pid2vp(getpid())
#define _RPMSQ_INTERNAL
#define _RPMSQ_DEBUG   0
#define rpmsigTbl_sigint   (&rpmsigTbl[0])
#define rpmsigTbl_sigquit   (&rpmsigTbl[1])
#define rpmsigTbl_sigchld   (&rpmsigTbl[2])
#define rpmsigTbl_sighup   (&rpmsigTbl[3])
#define rpmsigTbl_sigterm   (&rpmsigTbl[4])
#define rpmsigTbl_sigpipe   (&rpmsigTbl[5])

Functions

static void * __pid2vp (pid_t pid)
int rpmsqInsert (void *elem, void *prev)
 Insert node into from queue.
int rpmsqRemove (void *elem)
 Remove node from queue.
void rpmsqAction (int signum, void *info, void *context)
 Default signal handler.
int rpmsqEnable (int signum, rpmsqAction_t handler)
 Enable or disable a signal handler.
pid_t rpmsqFork (rpmsq sq)
 Fork a child process.
static int rpmsqWaitUnregister (rpmsq sq)
 Wait for child process to be reaped, and unregister SIGCHLD handler.
pid_t rpmsqWait (rpmsq sq)
 Wait for child process to be reaped.
void * rpmsqThread (void *(*start)(void *arg), void *arg)
 Call a function in a thread.
int rpmsqJoin (void *thread)
 Wait for thread to terminate.
int rpmsqThreadEqual (void *thread)
 Compare thread with current thread.
int rpmsqExecve (const char **argv)
 SIGCHLD cancellation handler.

Variables

int _rpmsq_debug = 0
static struct rpmsqElem rpmsqRock = { .q_forw = &rpmsqRock }
rpmsq rpmsqQueue = &rpmsqRock
sigset_t rpmsqCaught
static struct rpmsig_s rpmsigTbl []

Detailed Description

Definition in file rpmsq.c.


Define Documentation

#define _RPMSQ_DEBUG   0

Definition at line 276 of file rpmsq.c.

#define _RPMSQ_INTERNAL

Definition at line 271 of file rpmsq.c.

#define ADD_REF (   __tbl)    /*@-noeffect@*/ (0)

Definition at line 251 of file rpmsq.c.

Referenced by rpmsqEnable(), and rpmsqExecve().

#define CLEANUP_HANDLER (   __handler,
  __arg,
  __oldtypeptr 
)

Definition at line 253 of file rpmsq.c.

Referenced by rpmsqExecve().

#define CLEANUP_RESET (   __execute,
  __oldtype 
)

Definition at line 254 of file rpmsq.c.

Referenced by rpmsqExecve().

#define DO_LOCK ( )    (0)

Definition at line 248 of file rpmsq.c.

Referenced by rpmsqEnable(), and rpmsqExecve().

#define DO_UNLOCK ( )    (0)

Definition at line 249 of file rpmsq.c.

Referenced by rpmsqEnable(), and rpmsqExecve().

#define INIT_LOCK ( )

Definition at line 250 of file rpmsq.c.

Referenced by rpmsqExecve().

#define ME ( )    __pid2vp(getpid())
#define rpmsigTbl_sigchld   (&rpmsigTbl[2])

Referenced by rpmsqExecve().

#define rpmsigTbl_sighup   (&rpmsigTbl[3])
#define rpmsigTbl_sigint   (&rpmsigTbl[0])

Referenced by rpmsqExecve().

#define rpmsigTbl_sigpipe   (&rpmsigTbl[5])
#define rpmsigTbl_sigquit   (&rpmsigTbl[1])

Referenced by rpmsqExecve().

#define rpmsigTbl_sigterm   (&rpmsigTbl[4])
#define SAME_THREAD (   _a,
  _b 
)    (42)

Definition at line 256 of file rpmsq.c.

#define SUB_REF (   __tbl)    /*@-noeffect@*/ (0)

Definition at line 252 of file rpmsq.c.

Referenced by rpmsqEnable(), and rpmsqExecve().


Function Documentation

static void* __pid2vp ( pid_t  pid) [static]

Definition at line 261 of file rpmsq.c.

void rpmsqAction ( int  signum,
void *  info,
void *  context 
)

Default signal handler.

Parameters:
signumsignal number
info(siginfo_t) signal info
contextsignal context

Definition at line 390 of file rpmsq.c.

References errno, rpmsigTbl, and rpmsig_s::signum.

Referenced by rpmsqEnable().

int rpmsqEnable ( int  signum,
rpmsqAction_t  handler 
)

Enable or disable a signal handler.

Parameters:
signumsignal to enable (or disable if negative)
handlersa_sigaction handler (or NULL to use rpmsqHandler())
Returns:
no. of refs, -1 on error

Definition at line 439 of file rpmsq.c.

References ADD_REF, DO_LOCK, DO_UNLOCK, ME, rpmsigTbl, rpmsqAction(), rpmsig_s::signum, and SUB_REF.

Referenced by rpmdbClose(), rpmdbOpenDatabase(), rpmsqExecve(), rpmsqFork(), and rpmsqWaitUnregister().

int rpmsqExecve ( const char **  argv)

SIGCHLD cancellation handler.

Execute a command, returning its status.

Definition at line 728 of file rpmsq.c.

References ADD_REF, alloca(), CLEANUP_HANDLER, CLEANUP_RESET, DO_LOCK, DO_UNLOCK, errno, INIT_LOCK, rpmsigTbl_sigchld, rpmsigTbl_sigint, rpmsigTbl_sigquit, rpmsqEnable(), and SUB_REF.

pid_t rpmsqFork ( rpmsq  sq)

Fork a child process.

Parameters:
sqscriptlet queue element
Returns:
fork(2) pid

Definition at line 495 of file rpmsq.c.

References ME, rpmsqEnable(), and rpmsqInsert().

Referenced by runScript().

int rpmsqInsert ( void *  elem,
void *  prev 
)

Insert node into from queue.

Parameters:
elemnode to link
prevprevious node from queue
Returns:
0 on success

Definition at line 291 of file rpmsq.c.

References ME.

Referenced by rpmsqFork().

int rpmsqJoin ( void *  thread)

Wait for thread to terminate.

Parameters:
threadthread
Returns:
0 on success

Definition at line 671 of file rpmsq.c.

Referenced by fsmNext(), iosmNext(), and rpmpsmNext().

int rpmsqRemove ( void *  elem)

Remove node from queue.

Parameters:
elemnode to link
Returns:
0 on success

Definition at line 320 of file rpmsq.c.

References ME.

Referenced by rpmsqWaitUnregister().

void* rpmsqThread ( void *(*)(void *arg)  start,
void *  arg 
)

Call a function in a thread.

Parameters:
startfunction
argfunction argument
Returns:
thread pointer (NULL on error)

Definition at line 656 of file rpmsq.c.

Referenced by fsmNext(), iosmNext(), and rpmpsmNext().

int rpmsqThreadEqual ( void *  thread)

Compare thread with current thread.

Parameters:
threadthread
Returns:
0 if not equal

Definition at line 684 of file rpmsq.c.

pid_t rpmsqWait ( rpmsq  sq)

Wait for child process to be reaped.

Parameters:
sqscriptlet queue element
Returns:
reaped child pid

Definition at line 624 of file rpmsq.c.

References ME, and rpmsqWaitUnregister().

Referenced by psmWait().

static int rpmsqWaitUnregister ( rpmsq  sq) [static]

Wait for child process to be reaped, and unregister SIGCHLD handler.

Todo:
Rewrite to use waitpid on helper thread.
Parameters:
sqscriptlet queue element
Returns:
0 on success

Definition at line 557 of file rpmsq.c.

References ME, rpmsqEnable(), rpmsqRemove(), rpmswEnter(), and rpmswExit().

Referenced by rpmsqWait().


Variable Documentation

int _rpmsq_debug = 0

Definition at line 278 of file rpmsq.c.

struct rpmsig_s rpmsigTbl[] [static]

Referenced by rpmsqAction(), and rpmsqEnable().

sigset_t rpmsqCaught

Definition at line 352 of file rpmsq.c.

Referenced by rpmdbCheckSignals(), rpmdbCheckTerminate(), and signalsCaught().

Definition at line 288 of file rpmsq.c.

struct rpmsqElem rpmsqRock = { .q_forw = &rpmsqRock } [static]

Definition at line 283 of file rpmsq.c.