198c976f7e
that passes signal map along. This mechanisms is also used for nonuser signals like SIGKMESS, SIGKSTOP, SIGKSIG. Revised comments of many system call handlers. Renamed setpriority to nice.
81 lines
2.6 KiB
C
81 lines
2.6 KiB
C
/* The system 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 system call are:
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* m2_i1: SIG_PROC # 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 <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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rp = proc_addr(m_ptr->SIG_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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kmemcpy(&sc.sc_regs, &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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return(OK);
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}
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#endif /* USE_SIGSEND */
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