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#ifndef lint |
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static const char RCSid[] = "$Id: process.c,v 2.11 2021/01/15 19:01:53 greg Exp $"; |
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#endif |
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/* |
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* Routines to communicate with separate process via dual pipes |
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* |
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* External symbols declared in rtprocess.h |
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*/ |
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|
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#include "copyright.h" |
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|
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#include "rtprocess.h" |
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|
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/* |
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|
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The functions open_process() and close_process() exist in |
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(currently) two versions, which are found in the files: |
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|
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win_process.c |
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unix_process.c |
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|
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*/ |
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|
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int |
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process( /* process data through pd */ |
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SUBPROC *pd, |
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void *recvbuf, void *sendbuf, |
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int nbr, int nbs |
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) |
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{ |
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if (!(pd->flags & PF_RUNNING)) |
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return(-1); |
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if (writebuf(pd->w, sendbuf, nbs) < nbs) |
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return(-1); |
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return(readbuf(pd->r, recvbuf, nbr)); |
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} |
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|
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|
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|
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ssize_t |
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readbuf( /* read all of requested buffer */ |
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int fd, |
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void *buf, |
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ssize_t siz |
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) |
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{ |
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char *bpos = (char *)buf; |
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ssize_t cc = 0, nrem = siz; |
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retry: |
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while (nrem > 0 && (cc = read(fd, bpos, nrem)) > 0) { |
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bpos += cc; |
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nrem -= cc; |
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} |
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if (cc < 0) { |
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#ifndef BSD |
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if (errno == EINTR) /* we were interrupted! */ |
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goto retry; |
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#endif |
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return(cc); |
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} |
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return(siz-nrem); |
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} |
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|
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|
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ssize_t |
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writebuf( /* write all of requested buffer */ |
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int fd, |
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void *buf, |
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ssize_t siz |
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) |
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{ |
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char *bpos = (char *)buf; |
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ssize_t cc = 0, nrem = siz; |
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retry: |
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while (nrem > 0 && (cc = write(fd, bpos, nrem)) > 0) { |
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bpos += cc; |
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nrem -= cc; |
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} |
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if (cc < 0) { |
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#ifndef BSD |
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if (errno == EINTR) /* we were interrupted! */ |
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goto retry; |
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#endif |
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return(cc); |
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} |
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return(siz-nrem); |
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} |
