?? writen.c
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/* include writen */#include "unpipc.h"ssize_t /* Write "n" bytes to a descriptor. */writen(int fd, const void *vptr, size_t n){ size_t nleft; ssize_t nwritten; const char *ptr; ptr = vptr; nleft = n; while (nleft > 0) { if ( (nwritten = write(fd, ptr, nleft)) <= 0) { if (errno == EINTR) nwritten = 0; /* and call write() again */ else return(-1); /* error */ } nleft -= nwritten; ptr += nwritten; } return(n);}/* end writen */voidWriten(int fd, void *ptr, size_t nbytes){ if (writen(fd, ptr, nbytes) != nbytes) err_sys("writen error");}
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