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Make sigsuspend() work well enough to keep zsh hackers happy.

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git-svn-id: svn://svn.valgrind.org/valgrind/trunk@489
This commit is contained in:
Julian Seward
2002-07-13 11:05:45 +00:00
parent e5a8caf44e
commit 4ea574f4f0
2 changed files with 106 additions and 0 deletions
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53
coregrind/vg_clientfuncs.c
View File

@@ -499,6 +499,59 @@ void* memcpy( void *dst, const void *src, unsigned int len )
return dst;
}
/* ---------------------------------------------------------------------
Horrible hack to make sigsuspend() sort-of work OK. Same trick as
for pause() in vg_libpthread.so.
------------------------------------------------------------------ */
/* Horrible because
-- uses VG_(ksigprocmask), VG_(nanosleep) and vg_assert, which are
valgrind-native (not intended for client use).
-- This is here so single-threaded progs (not linking libpthread.so)
can see it. But pause() should also be here. ???
*/
/* Either libc supplies this (weak) or our libpthread.so supplies it
(strong) in a threaded setting.
*/
extern int* __errno_location ( void );
int sigsuspend ( /* const sigset_t * */ void* mask)
{
unsigned int n_orig, n_now;
struct vki_timespec nanosleep_interval;
VALGRIND_MAGIC_SEQUENCE(n_orig, 0xFFFFFFFF /* default */,
VG_USERREQ__GET_N_SIGS_RETURNED,
0, 0, 0, 0);
vg_assert(n_orig != 0xFFFFFFFF);
VG_(ksigprocmask)(VKI_SIG_SETMASK, mask, NULL);
while (1) {
VALGRIND_MAGIC_SEQUENCE(n_now, 0xFFFFFFFF /* default */,
VG_USERREQ__GET_N_SIGS_RETURNED,
0, 0, 0, 0);
vg_assert(n_now != 0xFFFFFFFF);
vg_assert(n_now >= n_orig);
if (n_now != n_orig) break;
nanosleep_interval.tv_sec = 0;
nanosleep_interval.tv_nsec = 53 * 1000 * 1000; /* 53 milliseconds */
/* It's critical here that valgrind's nanosleep implementation
is nonblocking. */
VG_(nanosleep)( &nanosleep_interval, NULL);
}
/* Maybe this is OK both in single and multithreaded setting. */
* (__errno_location()) = -VKI_EINTR; /* == EINTR; */
return -1;
}
/*--------------------------------------------------------------------*/
/*--- end vg_clientfuncs.c ---*/
/*--------------------------------------------------------------------*/

53
vg_clientfuncs.c
View File

@@ -499,6 +499,59 @@ void* memcpy( void *dst, const void *src, unsigned int len )
return dst;
}
/* ---------------------------------------------------------------------
Horrible hack to make sigsuspend() sort-of work OK. Same trick as
for pause() in vg_libpthread.so.
------------------------------------------------------------------ */
/* Horrible because
-- uses VG_(ksigprocmask), VG_(nanosleep) and vg_assert, which are
valgrind-native (not intended for client use).
-- This is here so single-threaded progs (not linking libpthread.so)
can see it. But pause() should also be here. ???
*/
/* Either libc supplies this (weak) or our libpthread.so supplies it
(strong) in a threaded setting.
*/
extern int* __errno_location ( void );
int sigsuspend ( /* const sigset_t * */ void* mask)
{
unsigned int n_orig, n_now;
struct vki_timespec nanosleep_interval;
VALGRIND_MAGIC_SEQUENCE(n_orig, 0xFFFFFFFF /* default */,
VG_USERREQ__GET_N_SIGS_RETURNED,
0, 0, 0, 0);
vg_assert(n_orig != 0xFFFFFFFF);
VG_(ksigprocmask)(VKI_SIG_SETMASK, mask, NULL);
while (1) {
VALGRIND_MAGIC_SEQUENCE(n_now, 0xFFFFFFFF /* default */,
VG_USERREQ__GET_N_SIGS_RETURNED,
0, 0, 0, 0);
vg_assert(n_now != 0xFFFFFFFF);
vg_assert(n_now >= n_orig);
if (n_now != n_orig) break;
nanosleep_interval.tv_sec = 0;
nanosleep_interval.tv_nsec = 53 * 1000 * 1000; /* 53 milliseconds */
/* It's critical here that valgrind's nanosleep implementation
is nonblocking. */
VG_(nanosleep)( &nanosleep_interval, NULL);
}
/* Maybe this is OK both in single and multithreaded setting. */
* (__errno_location()) = -VKI_EINTR; /* == EINTR; */
return -1;
}
/*--------------------------------------------------------------------*/
/*--- end vg_clientfuncs.c ---*/
/*--------------------------------------------------------------------*/