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More vfork(): If we get to vfork() via system call, then we need to clone some system call information so that the return form the cloned system call works correctly

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This commit is contained in:
Gregory Nutt 2014-09-29 10:59:15 -06:00
parent eeb57240de
commit e4deeada85
1 changed files with 20 additions and 0 deletions
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20
arch/arm/src/common/up_vfork.c
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@ -227,6 +227,26 @@ pid_t up_vfork(const struct vfork_s *context)
child->cmn.xcp.regs[REG_FP] = newfp; /* Frame pointer */
child->cmn.xcp.regs[REG_SP] = newsp; /* Stack pointer */
#ifdef CONFIG_LIB_SYSCALL
/* If we got here via a syscall, then we are going to have to setup some
* syscall return information as well.
*/
if (parent->xcp.nsyscalls > 0)
{
int index;
for (index = 0; index < parent->xcp.nsyscalls; index++)
{
child->cmn.xcp.syscall[index].sysreturn =
parent->xcp.syscall[index].sysreturn;
child->cmn.xcp.syscall[index].excreturn =
parent->xcp.syscall[index].excreturn;
}
child->cmn.xcp.nsyscalls = parent->xcp.nsyscalls;
}
#endif
/* And, finally, start the child task. On a failure, task_vforkstart()
* will discard the TCB by calling task_vforkabort().
*/