42ab148155
New configuration header file to include/ exclude functionality. Extracted privileged features from struct proc and create new struct priv. Renamed various system calls for readability.
73 lines
2 KiB
C
73 lines
2 KiB
C
/* The system call implemented in this file:
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* m_type: SYS_SVRCTL
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*
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* The parameters for this system call are:
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* m2_i1: CTL_PROC_NR (process number of caller)
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* m2_i2: CTL_REQUEST (request type)
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* m2_i3: CTL_MM_PRIV (privilege)
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* m2_l1: CTL_SEND_MASK (new send mask to be installed)
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* m2_l2: CTL_PROC_TYPE (new process type)
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* m2_p1: CTL_ARG_PTR (argument pointer)
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*/
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#include "../system.h"
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#include "../ipc.h"
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#include <sys/svrctl.h>
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#if USE_SVRCTL
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/* NOTE: this call will radically change! */
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/*===========================================================================*
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* do_svrctl *
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*===========================================================================*/
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PUBLIC int do_svrctl(m_ptr)
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message *m_ptr; /* pointer to request message */
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{
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register struct proc *rp;
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register struct priv *sp;
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int proc_nr, rights;
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int request;
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vir_bytes argp;
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/* Extract message parameters. */
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proc_nr = m_ptr->CTL_PROC_NR;
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if (proc_nr == SELF) proc_nr = m_ptr->m_source;
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if (! isokprocn(proc_nr)) return(EINVAL);
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request = m_ptr->CTL_REQUEST;
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rights = m_ptr->CTL_MM_PRIV;
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argp = (vir_bytes) m_ptr->CTL_ARG_PTR;
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rp = proc_addr(proc_nr);
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/* Check if the PM privileges are super user. */
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if (!rights || !isuserp(rp))
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return(EPERM);
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/* See what is requested and handle the request. */
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switch (request) {
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case SYSSIGNON: {
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/* Make this process a server. The system processes should be able
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* to communicate with this new server, so update their send masks
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* as well.
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*/
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/* Find a new system privileges structure for this process. */
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for (sp=BEG_PRIV_ADDR; sp< END_PRIV_ADDR; sp++)
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if (sp->s_proc_nr == NONE) break;
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if (sp->s_proc_nr != NONE) return(ENOSPC);
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/* Now update the process' privileges as requested. */
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rp->p_priv = sp; /* assign to process */
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rp->p_priv->s_proc_nr = proc_nr(rp); /* set association */
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rp->p_priv->s_call_mask = SYSTEM_CALL_MASK;
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return(OK);
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}
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default:
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return(EINVAL);
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}
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}
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#endif /* USE_SVRCTL */
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