JehanneOS/newlib
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Cygwin: Fix return value of sched_getaffinity

Browse Source 
Have sched_getaffinity() interface like glibc's, and provide an
undocumented internal interface __sched_getaffinity_sys() like the Linux
kernel's sched_getaffinity() for benefit of taskset(1).
This commit is contained in:
Mark Geisert
2019-06-26 02:44:56 -07:00
committed by Corinna Vinschen
parent 383e19ca55
commit fff17ad73f
4 changed files with 31 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

29
winsup/cygwin/sched.cc
View File

@ -555,8 +555,9 @@ done:
}
int
sched_getaffinity (pid_t pid, size_t sizeof_set, cpu_set_t *set)
__sched_getaffinity_sys (pid_t pid, size_t sizeof_set, cpu_set_t *set)
{
/* Emulate Linux raw sched_getaffinity syscall for benefit of taskset(1) */
HANDLE process = 0;
int status = 0;
@ -603,14 +604,21 @@ done:
if (status)
{
set_errno (status);
status = -1;
return -1;
}
else
{
/* Emulate documented Linux kernel behavior on successful return */
status = wincap.cpu_count ();
}
return status;
/* On successful return, we would ordinarily return 0, but instead we
emulate the behavior of the raw sched_getaffinity syscall on Linux. */
return min (sizeof_set, sizeof (cpu_set_t));
}
int
sched_getaffinity (pid_t pid, size_t sizeof_set, cpu_set_t *set)
{
/* Emulate the Linux glibc interface of sched_getaffinity() by calling
the raw syscall emulation and mapping positive results to 0. */
int status = __sched_getaffinity_sys (pid, sizeof_set, set);
return status > 0 ? 0 : status;
}
int
@ -727,9 +735,10 @@ done:
if (status)
{
set_errno (status);
status = -1;
return -1;
}
return status;
return 0;
}
} /* extern C */