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add support of pid caching

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This commit is contained in:
Stefan Lankes 2012-04-24 20:47:36 +02:00
parent e6816bb0bd
commit 71a1502489
3 changed files with 16 additions and 8 deletions
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3
newlib/src/libgloss/metalsvm/config.h
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@ -22,5 +22,8 @@
/* support for section attributes */
#define HAVE_SECTION_ATTRIBUTES 1
/* definition of an invalid pid */
#define INVALID_PID 0
/* symbol prefix */
#define __SYMBOL_PREFIX ""

4
newlib/src/libgloss/metalsvm/fork.c
View file

@ -40,6 +40,8 @@
#include "warning.h"
#include "syscall.h"
extern int __private_pid;
int
_DEFUN (_fork, (),
_NOARGS)
@ -51,7 +53,7 @@ _DEFUN (_fork, (),
if (ret < 0) {
errno = -ret;
ret = -1;
}
} else __private_pid = INVALID_PID;
return ret;
}

17
newlib/src/libgloss/metalsvm/getpid.c
View file

@ -40,17 +40,20 @@
#include "warning.h"
#include "syscall.h"
int __private_pid = INVALID_PID;
int
_DEFUN (_getpid, (),
_NOARGS)
{
int ret;
ret = SYSCALL0(__NR_getpid);
if (ret < 0) {
errno = -ret;
ret = -1;
if (__private_pid == INVALID_PID) {
__private_pid = SYSCALL0(__NR_getpid);
if (__private_pid < 0) {
errno = -__private_pid;
__private_pid = INVALID_PID;
return -1;
}
}
return ret;
return __private_pid;
}