86 lines
2 KiB
C
86 lines
2 KiB
C
#include "lib.h"
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PUBLIC int errno; /* place where error numbers go */
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PUBLIC int callm1(proc, syscallnr, int1, int2, int3, ptr1, ptr2, ptr3)
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int proc; /* FS or MM */
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int syscallnr; /* which system call */
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int int1; /* first integer parameter */
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int int2; /* second integer parameter */
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int int3; /* third integer parameter */
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char *ptr1; /* pointer parameter */
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char *ptr2; /* pointer parameter */
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char *ptr3; /* pointer parameter */
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{
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/* Send a message and get the response. The 'M.m_type' field of the
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* reply contains a value (>= 0) or an error code (<0). Use message format m1.
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*/
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M.m1_i1 = int1;
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M.m1_i2 = int2;
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M.m1_i3 = int3;
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M.m1_p1 = ptr1;
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M.m1_p2 = ptr2;
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M.m1_p3 = ptr3;
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return callx(proc, syscallnr);
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}
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PUBLIC int callm3(proc, syscallnr, int1, name)
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int proc; /* FS or MM */
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int syscallnr; /* which system call */
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int int1; /* integer parameter */
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char *name; /* string */
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{
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/* This form of system call is used for those calls that contain at most
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* one integer parameter along with a string. If the string fits in the
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* message, it is copied there. If not, a pointer to it is passed.
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*/
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register int k;
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register char *rp;
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k = len(name);
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M.m3_i1 = k;
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M.m3_i2 = int1;
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M.m3_p1 = name;
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rp = &M.m3_ca1[0];
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if (k <= M3_STRING) while (k--) *rp++ = *name++;
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return callx(proc, syscallnr);
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}
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PUBLIC int callx(proc, syscallnr)
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int proc; /* FS or MM */
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int syscallnr; /* which system call */
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{
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/* Send a message and get the response. The 'M.m_type' field of the
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* reply contains a value (>= 0) or an error code (<0).
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*/
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int k;
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M.m_type = syscallnr;
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k = sendrec(proc, &M);
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if (k != OK) return(k); /* send itself failed */
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if (M.m_type < 0) {errno = -M.m_type; return(-1);}
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return(M.m_type);
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}
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PUBLIC int len(s)
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register char *s; /* character string whose length is needed */
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{
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/* Return the length of a character string, including the 0 at the end. */
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register int k;
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k = 0;
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while (*s++ != 0) k++;
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return(k+1); /* return length including the 0-byte at end */
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}
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