Rich Felker
c221d3e586
policy is that all public functions which have a public declaration should be defined in a context where that public declaration is visible, to avoid preventable type mismatches. an audit performed using GCC's -Wmissing-declarations turned up the violations corrected here. in some cases the public header had not been included; in others, a feature test macro needed to make the declaration visible had been omitted. in the case of gethostent and getnetent, the omission seems to have been intentional, as a hack to admit a single stub definition for both functions. this kind of hack is no longer acceptable; it's UB and would not fly with LTO or advanced toolchains. the hack is undone to make exposure of the declarations possible.
34 lines
496 B
C
34 lines
496 B
C
#define _BSD_SOURCE
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#include <unistd.h>
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#include <sys/random.h>
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#include <pthread.h>
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#include <errno.h>
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int getentropy(void *buffer, size_t len)
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{
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int cs, ret;
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char *pos = buffer;
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if (len > 256) {
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errno = EIO;
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return -1;
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}
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pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
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while (len) {
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ret = getrandom(pos, len, 0);
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if (ret < 0) {
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if (errno == EINTR) continue;
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else break;
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}
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pos += ret;
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len -= ret;
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ret = 0;
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}
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pthread_setcancelstate(cs, 0);
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return ret;
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}
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