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musl/src/misc/getdomainname.c

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#define _GNU_SOURCE
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#include <unistd.h>
#include <sys/utsname.h>
#include <string.h>
#include <errno.h>
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int getdomainname(char *name, size_t len)
{
struct utsname temp;
uname(&temp);
if (!len || strlen(temp.domainname) >= len) {
errno = EINVAL;
return -1;
}
strcpy(name, temp.domainname);
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return 0;
}