PWrite.c

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#include "syshdrs.h"
 
#if !defined(NO_SIGNALS) && defined(SIGPIPE)
extern volatile Sjmp_buf gPipeJmp;
#endif
int
PWrite(int sfd, const char *const buf0, size_t size)
{
    volatile int nleft;
    const char *volatile buf = buf0;
    int nwrote;
#if !defined(NO_SIGNALS) && defined(SIGPIPE)
    vsio_sigproc_t sigpipe;
 
    if (SSetjmp(gPipeJmp) != 0) {
        (void) SSignal(SIGPIPE, (sio_sigproc_t) sigpipe);
        nwrote = size - nleft;
        if (nwrote > 0)
            return (nwrote);
        errno = EPIPE;
        return (kBrokenPipeErr);
    }
 
    sigpipe = (vsio_sigproc_t) SSignal(SIGPIPE, SIOHandler);
#endif
 
    nleft = (int) size;
    forever {
        nwrote = write(sfd, buf, nleft);
        if (nwrote < 0) {
            if (errno != EINTR) {
                nwrote = size - nleft;
                if (nwrote == 0)
                    nwrote = -1;
                goto done;
            } else {
                errno = 0;
                nwrote = 0;
                /* Try again. */
            }
        }
        nleft -= nwrote;
        if (nleft <= 0)
            break;
        buf += nwrote;
    }
    nwrote = size - nleft;
 
done:
#if !defined(NO_SIGNALS) && defined(SIGPIPE)
    (void) SSignal(SIGPIPE, (sio_sigproc_t) sigpipe);
#endif
 
    return (nwrote);
}   /* PWrite */