65a1d21963
unblocks a process that has no priority (stopped with sys_nice() and PRIO_STOP) and reschedules it if that gives it RTS flags of 0.
91 lines
2.9 KiB
C
91 lines
2.9 KiB
C
/* The kernel call that is implemented in this file:
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* m_type: SYS_SIGSEND
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*
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* The parameters for this kernel call are:
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* m2_i1: SIG_ENDPT # process to call signal handler
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* m2_p1: SIG_CTXT_PTR # pointer to sigcontext structure
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* m2_i3: SIG_FLAGS # flags for S_SIGRETURN call
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*
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*/
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#include "../system.h"
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#include <signal.h>
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#include <string.h>
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#include <sys/sigcontext.h>
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#if USE_SIGSEND
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/*===========================================================================*
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* do_sigsend *
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*===========================================================================*/
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PUBLIC int do_sigsend(m_ptr)
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message *m_ptr; /* pointer to request message */
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{
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/* Handle sys_sigsend, POSIX-style signal handling. */
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struct sigmsg smsg;
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register struct proc *rp;
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phys_bytes src_phys, dst_phys;
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struct sigcontext sc, *scp;
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struct sigframe fr, *frp;
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int proc;
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if (!isokendpt(m_ptr->SIG_ENDPT, &proc)) return(EINVAL);
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if (iskerneln(proc)) return(EPERM);
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rp = proc_addr(proc);
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/* Get the sigmsg structure into our address space. */
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src_phys = umap_local(proc_addr(PM_PROC_NR), D, (vir_bytes)
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m_ptr->SIG_CTXT_PTR, (vir_bytes) sizeof(struct sigmsg));
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if (src_phys == 0) return(EFAULT);
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phys_copy(src_phys,vir2phys(&smsg),(phys_bytes) sizeof(struct sigmsg));
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/* Compute the user stack pointer where sigcontext will be stored. */
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scp = (struct sigcontext *) smsg.sm_stkptr - 1;
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/* Copy the registers to the sigcontext structure. */
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memcpy(&sc.sc_regs, (char *) &rp->p_reg, sizeof(struct sigregs));
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/* Finish the sigcontext initialization. */
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sc.sc_flags = SC_SIGCONTEXT;
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sc.sc_mask = smsg.sm_mask;
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/* Copy the sigcontext structure to the user's stack. */
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dst_phys = umap_local(rp, D, (vir_bytes) scp,
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(vir_bytes) sizeof(struct sigcontext));
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if (dst_phys == 0) return(EFAULT);
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phys_copy(vir2phys(&sc), dst_phys, (phys_bytes) sizeof(struct sigcontext));
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/* Initialize the sigframe structure. */
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frp = (struct sigframe *) scp - 1;
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fr.sf_scpcopy = scp;
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fr.sf_retadr2= (void (*)()) rp->p_reg.pc;
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fr.sf_fp = rp->p_reg.fp;
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rp->p_reg.fp = (reg_t) &frp->sf_fp;
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fr.sf_scp = scp;
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fr.sf_code = 0; /* XXX - should be used for type of FP exception */
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fr.sf_signo = smsg.sm_signo;
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fr.sf_retadr = (void (*)()) smsg.sm_sigreturn;
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/* Copy the sigframe structure to the user's stack. */
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dst_phys = umap_local(rp, D, (vir_bytes) frp,
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(vir_bytes) sizeof(struct sigframe));
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if (dst_phys == 0) return(EFAULT);
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phys_copy(vir2phys(&fr), dst_phys, (phys_bytes) sizeof(struct sigframe));
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/* Reset user registers to execute the signal handler. */
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rp->p_reg.sp = (reg_t) frp;
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rp->p_reg.pc = (reg_t) smsg.sm_sighandler;
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/* Reschedule if necessary. */
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if(rp->p_rts_flags & NO_PRIORITY) {
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rp->p_rts_flags &= ~NO_PRIORITY;
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if (rp->p_rts_flags == 0) lock_enqueue(rp);
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} else kprintf("system: warning: sigsend a running process\n");
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return(OK);
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}
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#endif /* USE_SIGSEND */
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