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28 lines
580 B
C
28 lines
580 B
C
#include <unistd.h>
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#include <poll.h>
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#include <errno.h>
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#include "io_internal.h"
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int64 io_waitread(int64 d,char* buf,int64 len) {
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long r;
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struct pollfd p;
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io_entry* e=array_get(&io_fds,sizeof(io_entry),d);
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if (!e) { errno=EBADF; return -3; }
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if (e->nonblock) {
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again:
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p.fd=d;
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if (p.fd != d) { errno=EBADF; return -3; } /* catch overflow */
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p.events=POLLIN;
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switch (poll(&p,1,-1)) {
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case -1: if (errno==EAGAIN) goto again; return -3;
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}
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}
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r=read(d,buf,len);
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if (r==-1) {
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if (errno==EAGAIN)
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goto again;
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r=-3;
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}
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return r;
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}
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