Delete bundled copy of NSS and replace with README.

nss/lib/freebl/unix_rand.c

Index: nss/lib/freebl/unix_rand.c
diff --git a/nss/lib/freebl/unix_rand.c b/nss/lib/freebl/unix_rand.c
deleted file mode 100644
index e0d8f58732e53087325b12a67dd905b7bfe538e6..0000000000000000000000000000000000000000
--- a/nss/lib/freebl/unix_rand.c
+++ /dev/null
@@ -1,1193 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include <stdio.h>
-#include <string.h>
-#include <signal.h>
-#include <unistd.h>
-#include <limits.h>
-#include <errno.h>
-#include <stdlib.h>
-#include <sys/time.h>
-#include <sys/wait.h>
-#include <sys/stat.h>
-#include "secrng.h"
-#include "secerr.h"
-#include "prerror.h"
-#include "prthread.h"
-#include "prprf.h"
-#include "prenv.h"
-
-size_t RNG_FileUpdate(const char *fileName, size_t limit);
-
-/*
- * When copying data to the buffer we want the least signicant bytes
- * from the input since those bits are changing the fastest. The address
- * of least significant byte depends upon whether we are running on
- * a big-endian or little-endian machine.
- *
- * Does this mean the least signicant bytes are the most significant
- * to us? :-)
- */
-    
-static size_t CopyLowBits(void *dst, size_t dstlen, void *src, size_t srclen)
-{
-    union endianness {
-	PRInt32 i;
-	char c[4];
-    } u;
-
-    if (srclen <= dstlen) {
-	memcpy(dst, src, srclen);
-	return srclen;
-    }
-    u.i = 0x01020304;
-    if (u.c[0] == 0x01) {
-	/* big-endian case */
-	memcpy(dst, (char*)src + (srclen - dstlen), dstlen);
-    } else {
-	/* little-endian case */
-	memcpy(dst, src, dstlen);
-    }
-    return dstlen;
-}
-
-#ifdef SOLARIS
-
-#include <kstat.h>
-
-static const PRUint32 entropy_buf_len = 4096; /* buffer up to 4 KB */
-
-/* Buffer entropy data, and feed it to the RNG, entropy_buf_len bytes at a time.
- * Returns error if RNG_RandomUpdate fails. Also increments *total_fed
- * by the number of bytes successfully buffered.
- */
-static SECStatus BufferEntropy(char* inbuf, PRUint32 inlen,
-                                char* entropy_buf, PRUint32* entropy_buffered,
-                                PRUint32* total_fed)
-{
-    PRUint32 tocopy = 0;
-    PRUint32 avail = 0;
-    SECStatus rv = SECSuccess;
-
-    while (inlen) {
-        avail = entropy_buf_len - *entropy_buffered;
-        if (!avail) {
-            /* Buffer is full, time to feed it to the RNG. */
-            rv = RNG_RandomUpdate(entropy_buf, entropy_buf_len);
-            if (SECSuccess != rv) {
-                break;
-            }
-            *entropy_buffered = 0;
-            avail = entropy_buf_len;
-        }
-        tocopy = PR_MIN(avail, inlen);
-        memcpy(entropy_buf + *entropy_buffered, inbuf, tocopy);
-        *entropy_buffered += tocopy;
-        inlen -= tocopy;
-        inbuf += tocopy;
-        *total_fed += tocopy;
-    }
-    return rv;
-}
-
-/* Feed kernel statistics structures and ks_data field to the RNG.
- * Returns status as well as the number of bytes successfully fed to the RNG.
- */
-static SECStatus RNG_kstat(PRUint32* fed)
-{
-    kstat_ctl_t*    kc = NULL;
-    kstat_t*        ksp = NULL;
-    PRUint32        entropy_buffered = 0;
-    char*           entropy_buf = NULL;
-    SECStatus       rv = SECSuccess;
-
-    PORT_Assert(fed);
-    if (!fed) {
-        return SECFailure;
-    }
-    *fed = 0;
-
-    kc = kstat_open();
-    PORT_Assert(kc);
-    if (!kc) {
-        return SECFailure;
-    }
-    entropy_buf = (char*) PORT_Alloc(entropy_buf_len);
-    PORT_Assert(entropy_buf);
-    if (entropy_buf) {
-        for (ksp = kc->kc_chain; ksp != NULL; ksp = ksp->ks_next) {
-            if (-1 == kstat_read(kc, ksp, NULL)) {
-                /* missing data from a single kstat shouldn't be fatal */
-                continue;
-            }
-            rv = BufferEntropy((char*)ksp, sizeof(kstat_t),
-                                    entropy_buf, &entropy_buffered,
-                                    fed);
-            if (SECSuccess != rv) {
-                break;
-            }
-
-            if (ksp->ks_data && ksp->ks_data_size>0 && ksp->ks_ndata>0) {
-                rv = BufferEntropy((char*)ksp->ks_data, ksp->ks_data_size,
-                                        entropy_buf, &entropy_buffered,
-                                        fed);
-                if (SECSuccess != rv) {
-                    break;
-                }
-            }
-        }
-        if (SECSuccess == rv && entropy_buffered) {
-            /* Buffer is not empty, time to feed it to the RNG */
-            rv = RNG_RandomUpdate(entropy_buf, entropy_buffered);
-        }
-        PORT_Free(entropy_buf);
-    } else {
-        rv = SECFailure;
-    }
-    if (kstat_close(kc)) {
-        PORT_Assert(0);
-        rv = SECFailure;
-    }
-    return rv;
-}
-
-#endif
-
-#if defined(SCO) || defined(UNIXWARE) || defined(BSDI) || defined(FREEBSD) \
-    || defined(NETBSD) || defined(DARWIN) || defined(OPENBSD) \
-    || defined(NTO) || defined(__riscos__)
-#include <sys/times.h>
-
-#define getdtablesize() sysconf(_SC_OPEN_MAX)
-
-static size_t
-GetHighResClock(void *buf, size_t maxbytes)
-{
-    int ticks;
-    struct tms buffer;
-
-    ticks=times(&buffer);
-    return CopyLowBits(buf, maxbytes, &ticks, sizeof(ticks));
-}
-
-static void
-GiveSystemInfo(void)
-{
-    long si;
-
-    /* 
-     * Is this really necessary?  Why not use rand48 or something?
-     */
-    si = sysconf(_SC_CHILD_MAX);
-    RNG_RandomUpdate(&si, sizeof(si));
-
-    si = sysconf(_SC_STREAM_MAX);
-    RNG_RandomUpdate(&si, sizeof(si));
-
-    si = sysconf(_SC_OPEN_MAX);
-    RNG_RandomUpdate(&si, sizeof(si));
-}
-#endif
-
-#if defined(__sun)
-#if defined(__svr4) || defined(SVR4)
-#include <sys/systeminfo.h>
-
-#define getdtablesize() sysconf(_SC_OPEN_MAX)
-
-static void
-GiveSystemInfo(void)
-{
-    int rv;
-    char buf[2000];
-
-    rv = sysinfo(SI_MACHINE, buf, sizeof(buf));
-    if (rv > 0) {
-	RNG_RandomUpdate(buf, rv);
-    }
-    rv = sysinfo(SI_RELEASE, buf, sizeof(buf));
-    if (rv > 0) {
-	RNG_RandomUpdate(buf, rv);
-    }
-    rv = sysinfo(SI_HW_SERIAL, buf, sizeof(buf));
-    if (rv > 0) {
-	RNG_RandomUpdate(buf, rv);
-    }
-}
-
-static size_t
-GetHighResClock(void *buf, size_t maxbytes)
-{
-    hrtime_t t;
-    t = gethrtime();
-    if (t) {
-	return CopyLowBits(buf, maxbytes, &t, sizeof(t));
-    }
-    return 0;
-}
-#else /* SunOS (Sun, but not SVR4) */
-
-extern long sysconf(int name);
-
-static size_t
-GetHighResClock(void *buf, size_t maxbytes)
-{
-    return 0;
-}
-
-static void
-GiveSystemInfo(void)
-{
-    long si;
-
-    /* This is not very good */
-    si = sysconf(_SC_CHILD_MAX);
-    RNG_RandomUpdate(&si, sizeof(si));
-}
-#endif
-#endif /* Sun */
-
-#if defined(__hpux)
-#include <sys/unistd.h>
-
-#define getdtablesize() sysconf(_SC_OPEN_MAX)
-
-#if defined(__ia64)
-#include <ia64/sys/inline.h>
-
-static size_t
-GetHighResClock(void *buf, size_t maxbytes)
-{
-    PRUint64 t;
-
-    t = _Asm_mov_from_ar(_AREG44);
-    return CopyLowBits(buf, maxbytes, &t, sizeof(t));
-}
-#else
-static size_t
-GetHighResClock(void *buf, size_t maxbytes)
-{
-    extern int ret_cr16();
-    int cr16val;
-
-    cr16val = ret_cr16();
-    return CopyLowBits(buf, maxbytes, &cr16val, sizeof(cr16val));
-}
-#endif
-
-static void
-GiveSystemInfo(void)
-{
-    long si;
-
-    /* This is not very good */
-    si = sysconf(_AES_OS_VERSION);
-    RNG_RandomUpdate(&si, sizeof(si));
-    si = sysconf(_SC_CPU_VERSION);
-    RNG_RandomUpdate(&si, sizeof(si));
-}
-#endif /* HPUX */
-
-#if defined(OSF1)
-#include <sys/types.h>
-#include <sys/sysinfo.h>
-#include <sys/systeminfo.h>
-#include <c_asm.h>
-
-static void
-GiveSystemInfo(void)
-{
-    char buf[BUFSIZ];
-    int rv;
-    int off = 0;
-
-    rv = sysinfo(SI_MACHINE, buf, sizeof(buf));
-    if (rv > 0) {
-	RNG_RandomUpdate(buf, rv);
-    }
-    rv = sysinfo(SI_RELEASE, buf, sizeof(buf));
-    if (rv > 0) {
-	RNG_RandomUpdate(buf, rv);
-    }
-    rv = sysinfo(SI_HW_SERIAL, buf, sizeof(buf));
-    if (rv > 0) {
-	RNG_RandomUpdate(buf, rv);
-    }
-}
-
-/*
- * Use the "get the cycle counter" instruction on the alpha.
- * The low 32 bits completely turn over in less than a minute.
- * The high 32 bits are some non-counter gunk that changes sometimes.
- */
-static size_t
-GetHighResClock(void *buf, size_t maxbytes)
-{
-    unsigned long t;
-
-    t = asm("rpcc %v0");
-    return CopyLowBits(buf, maxbytes, &t, sizeof(t));
-}
-
-#endif /* Alpha */
-
-#if defined(_IBMR2)
-static size_t
-GetHighResClock(void *buf, size_t maxbytes)
-{
-    return 0;
-}
-
-static void
-GiveSystemInfo(void)
-{
-    /* XXX haven't found any yet! */
-}
-#endif /* IBM R2 */
-
-#if defined(LINUX)
-#include <sys/sysinfo.h>
-
-static size_t
-GetHighResClock(void *buf, size_t maxbytes)
-{
-    return 0;
-}
-
-static void
-GiveSystemInfo(void)
-{
-#ifndef NO_SYSINFO
-    struct sysinfo si;
-    if (sysinfo(&si) == 0) {
-	RNG_RandomUpdate(&si, sizeof(si));
-    }
-#endif
-}
-#endif /* LINUX */
-
-#if defined(NCR)
-
-#include <sys/utsname.h>
-#include <sys/systeminfo.h>
-
-#define getdtablesize() sysconf(_SC_OPEN_MAX)
-
-static size_t
-GetHighResClock(void *buf, size_t maxbytes)
-{
-    return 0;
-}
-
-static void
-GiveSystemInfo(void)
-{
-    int rv;
-    char buf[2000];
-
-    rv = sysinfo(SI_MACHINE, buf, sizeof(buf));
-    if (rv > 0) {
-	RNG_RandomUpdate(buf, rv);
-    }
-    rv = sysinfo(SI_RELEASE, buf, sizeof(buf));
-    if (rv > 0) {
-	RNG_RandomUpdate(buf, rv);
-    }
-    rv = sysinfo(SI_HW_SERIAL, buf, sizeof(buf));
-    if (rv > 0) {
-	RNG_RandomUpdate(buf, rv);
-    }
-}
-
-#endif /* NCR */
-
-#if defined(sgi)
-#include <fcntl.h>
-#undef PRIVATE
-#include <sys/mman.h>
-#include <sys/syssgi.h>
-#include <sys/immu.h>
-#include <sys/systeminfo.h>
-#include <sys/utsname.h>
-#include <wait.h>
-
-static void
-GiveSystemInfo(void)
-{
-    int rv;
-    char buf[4096];
-
-    rv = syssgi(SGI_SYSID, &buf[0]);
-    if (rv > 0) {
-	RNG_RandomUpdate(buf, MAXSYSIDSIZE);
-    }
-#ifdef SGI_RDUBLK
-    rv = syssgi(SGI_RDUBLK, getpid(), &buf[0], sizeof(buf));
-    if (rv > 0) {
-	RNG_RandomUpdate(buf, sizeof(buf));
-    }
-#endif /* SGI_RDUBLK */
-    rv = syssgi(SGI_INVENT, SGI_INV_READ, buf, sizeof(buf));
-    if (rv > 0) {
-	RNG_RandomUpdate(buf, sizeof(buf));
-    }
-    rv = sysinfo(SI_MACHINE, buf, sizeof(buf));
-    if (rv > 0) {
-	RNG_RandomUpdate(buf, rv);
-    }
-    rv = sysinfo(SI_RELEASE, buf, sizeof(buf));
-    if (rv > 0) {
-	RNG_RandomUpdate(buf, rv);
-    }
-    rv = sysinfo(SI_HW_SERIAL, buf, sizeof(buf));
-    if (rv > 0) {
-	RNG_RandomUpdate(buf, rv);
-    }
-}
-
-static size_t GetHighResClock(void *buf, size_t maxbuf)
-{
-    unsigned phys_addr, raddr, cycleval;
-    static volatile unsigned *iotimer_addr = NULL;
-    static int tries = 0;
-    static int cntr_size;
-    int mfd;
-    long s0[2];
-    struct timeval tv;
-
-#ifndef SGI_CYCLECNTR_SIZE
-#define SGI_CYCLECNTR_SIZE      165     /* Size user needs to use to read CC */
-#endif
-
-    if (iotimer_addr == NULL) {
-	if (tries++ > 1) {
-	    /* Don't keep trying if it didn't work */
-	    return 0;
-	}
-
-	/*
-	** For SGI machines we can use the cycle counter, if it has one,
-	** to generate some truly random numbers
-	*/
-	phys_addr = syssgi(SGI_QUERY_CYCLECNTR, &cycleval);
-	if (phys_addr) {
-	    int pgsz = getpagesize();
-	    int pgoffmask = pgsz - 1;
-
-	    raddr = phys_addr & ~pgoffmask;
-	    mfd = open("/dev/mmem", O_RDONLY);
-	    if (mfd < 0) {
-		return 0;
-	    }
-	    iotimer_addr = (unsigned *)
-		mmap(0, pgoffmask, PROT_READ, MAP_PRIVATE, mfd, (int)raddr);
-	    if (iotimer_addr == (void*)-1) {
-		close(mfd);
-		iotimer_addr = NULL;
-		return 0;
-	    }
-	    iotimer_addr = (unsigned*)
-		((__psint_t)iotimer_addr | (phys_addr & pgoffmask));
-	    /*
-	     * The file 'mfd' is purposefully not closed.
-	     */
-	    cntr_size = syssgi(SGI_CYCLECNTR_SIZE);
-	    if (cntr_size < 0) {
-		struct utsname utsinfo;
-
-		/* 
-		 * We must be executing on a 6.0 or earlier system, since the
-		 * SGI_CYCLECNTR_SIZE call is not supported.
-		 * 
-		 * The only pre-6.1 platforms with 64-bit counters are
-		 * IP19 and IP21 (Challenge, PowerChallenge, Onyx).
-		 */
-		uname(&utsinfo);
-		if (!strncmp(utsinfo.machine, "IP19", 4) ||
-		    !strncmp(utsinfo.machine, "IP21", 4))
-			cntr_size = 64;
-		else
-			cntr_size = 32;
-	    }
-	    cntr_size /= 8;	/* Convert from bits to bytes */
-	}
-    }
-
-    s0[0] = *iotimer_addr;
-    if (cntr_size > 4)
-	s0[1] = *(iotimer_addr + 1);
-    memcpy(buf, (char *)&s0[0], cntr_size);
-    return CopyLowBits(buf, maxbuf, &s0, cntr_size);
-}
-#endif
-
-#if defined(sony)
-#include <sys/systeminfo.h>
-
-#define getdtablesize() sysconf(_SC_OPEN_MAX)
-
-static size_t
-GetHighResClock(void *buf, size_t maxbytes)
-{
-    return 0;
-}
-
-static void
-GiveSystemInfo(void)
-{
-    int rv;
-    char buf[2000];
-
-    rv = sysinfo(SI_MACHINE, buf, sizeof(buf));
-    if (rv > 0) {
-	RNG_RandomUpdate(buf, rv);
-    }
-    rv = sysinfo(SI_RELEASE, buf, sizeof(buf));
-    if (rv > 0) {
-	RNG_RandomUpdate(buf, rv);
-    }
-    rv = sysinfo(SI_HW_SERIAL, buf, sizeof(buf));
-    if (rv > 0) {
-	RNG_RandomUpdate(buf, rv);
-    }
-}
-#endif /* sony */
-
-#if defined(sinix)
-#include <sys/systeminfo.h>
-#include <sys/times.h>
-
-int gettimeofday(struct timeval *, struct timezone *);
-int gethostname(char *, int);
-
-#define getdtablesize() sysconf(_SC_OPEN_MAX)
-
-static size_t
-GetHighResClock(void *buf, size_t maxbytes)
-{
-    int ticks;
-    struct tms buffer;
-
-    ticks=times(&buffer);
-    return CopyLowBits(buf, maxbytes, &ticks, sizeof(ticks));
-}
-
-static void
-GiveSystemInfo(void)
-{
-    int rv;
-    char buf[2000];
-
-    rv = sysinfo(SI_MACHINE, buf, sizeof(buf));
-    if (rv > 0) {
-	RNG_RandomUpdate(buf, rv);
-    }
-    rv = sysinfo(SI_RELEASE, buf, sizeof(buf));
-    if (rv > 0) {
-	RNG_RandomUpdate(buf, rv);
-    }
-    rv = sysinfo(SI_HW_SERIAL, buf, sizeof(buf));
-    if (rv > 0) {
-	RNG_RandomUpdate(buf, rv);
-    }
-}
-#endif /* sinix */
-
-
-#ifdef BEOS
-#include <be/kernel/OS.h>
-
-static size_t
-GetHighResClock(void *buf, size_t maxbytes)
-{
-    bigtime_t bigtime; /* Actually a int64 */
-
-    bigtime = real_time_clock_usecs();
-    return CopyLowBits(buf, maxbytes, &bigtime, sizeof(bigtime));
-}
-
-static void
-GiveSystemInfo(void)
-{
-    system_info *info = NULL;
-    PRInt32 val;
-    get_system_info(info);
-    if (info) {
-        val = info->boot_time;
-        RNG_RandomUpdate(&val, sizeof(val));
-        val = info->used_pages;
-        RNG_RandomUpdate(&val, sizeof(val));
-        val = info->used_ports;
-        RNG_RandomUpdate(&val, sizeof(val));
-        val = info->used_threads;
-        RNG_RandomUpdate(&val, sizeof(val));
-        val = info->used_teams;
-        RNG_RandomUpdate(&val, sizeof(val));
-    }
-}
-#endif /* BEOS */
-
-#if defined(nec_ews)
-#include <sys/systeminfo.h>
-
-#define getdtablesize() sysconf(_SC_OPEN_MAX)
-
-static size_t
-GetHighResClock(void *buf, size_t maxbytes)
-{
-    return 0;
-}
-
-static void
-GiveSystemInfo(void)
-{
-    int rv;
-    char buf[2000];
-
-    rv = sysinfo(SI_MACHINE, buf, sizeof(buf));
-    if (rv > 0) {
-	RNG_RandomUpdate(buf, rv);
-    }
-    rv = sysinfo(SI_RELEASE, buf, sizeof(buf));
-    if (rv > 0) {
-	RNG_RandomUpdate(buf, rv);
-    }
-    rv = sysinfo(SI_HW_SERIAL, buf, sizeof(buf));
-    if (rv > 0) {
-	RNG_RandomUpdate(buf, rv);
-    }
-}
-#endif /* nec_ews */
-
-size_t RNG_GetNoise(void *buf, size_t maxbytes)
-{
-    struct timeval tv;
-    int n = 0;
-    int c;
-
-    n = GetHighResClock(buf, maxbytes);
-    maxbytes -= n;
-
-    (void)gettimeofday(&tv, 0);
-    c = CopyLowBits((char*)buf+n, maxbytes, &tv.tv_usec, sizeof(tv.tv_usec));
-    n += c;
-    maxbytes -= c;
-    c = CopyLowBits((char*)buf+n, maxbytes, &tv.tv_sec, sizeof(tv.tv_sec));
-    n += c;
-    return n;
-}
-
-#define SAFE_POPEN_MAXARGS	10	/* must be at least 2 */
-
-/*
- * safe_popen is static to this module and we know what arguments it is
- * called with. Note that this version only supports a single open child
- * process at any time.
- */
-static pid_t safe_popen_pid;
-static struct sigaction oldact;
-
-static FILE *
-safe_popen(char *cmd)
-{
-    int p[2], fd, argc;
-    pid_t pid;
-    char *argv[SAFE_POPEN_MAXARGS + 1];
-    FILE *fp;
-    static char blank[] = " \t";
-    static struct sigaction newact;
-
-    if (pipe(p) < 0)
-	return 0;
-
-    fp = fdopen(p[0], "r");
-    if (fp == 0) {
-	close(p[0]);
-	close(p[1]);
-	return 0;
-    }
-
-    /* Setup signals so that SIGCHLD is ignored as we want to do waitpid */
-    newact.sa_handler = SIG_DFL;
-    newact.sa_flags = 0;
-    sigfillset(&newact.sa_mask);
-    sigaction (SIGCHLD, &newact, &oldact);
-
-    pid = fork();
-    switch (pid) {
-      int ndesc;
-
-      case -1:
-	fclose(fp); /* this closes p[0], the fd associated with fp */
-	close(p[1]);
-	sigaction (SIGCHLD, &oldact, NULL);
-	return 0;
-
-      case 0:
-	/* dup write-side of pipe to stderr and stdout */
-	if (p[1] != 1) dup2(p[1], 1);
-	if (p[1] != 2) dup2(p[1], 2);
-
-	/* 
-	 * close the other file descriptors, except stdin which we
-	 * try reassociating with /dev/null, first (bug 174993)
-	 */
-	if (!freopen("/dev/null", "r", stdin))
-	    close(0);
-	ndesc = getdtablesize();
-	for (fd = PR_MIN(65536, ndesc); --fd > 2; close(fd));
-
-	/* clean up environment in the child process */
-	putenv("PATH=/bin:/usr/bin:/sbin:/usr/sbin:/etc:/usr/etc");
-	putenv("SHELL=/bin/sh");
-	putenv("IFS= \t");
-
-	/*
-	 * The caller may have passed us a string that is in text
-	 * space. It may be illegal to modify the string
-	 */
-	cmd = strdup(cmd);
-	/* format argv */
-	argv[0] = strtok(cmd, blank);
-	argc = 1;
-	while ((argv[argc] = strtok(0, blank)) != 0) {
-	    if (++argc == SAFE_POPEN_MAXARGS) {
-		argv[argc] = 0;
-		break;
-	    }
-	}
-
-	/* and away we go */
-	execvp(argv[0], argv);
-	exit(127);
-	break;
-
-      default:
-	close(p[1]);
-	break;
-    }
-
-    /* non-zero means there's a cmd running */
-    safe_popen_pid = pid;
-    return fp;
-}
-
-static int
-safe_pclose(FILE *fp)
-{
-    pid_t pid;
-    int status = -1, rv;
-
-    if ((pid = safe_popen_pid) == 0)
-	return -1;
-    safe_popen_pid = 0;
-
-    fclose(fp);
-
-    /* yield the processor so the child gets some time to exit normally */
-    PR_Sleep(PR_INTERVAL_NO_WAIT);
-
-    /* if the child hasn't exited, kill it -- we're done with its output */
-    while ((rv = waitpid(pid, &status, WNOHANG)) == -1 && errno == EINTR)
-	;
-    if (rv == 0) {
-	kill(pid, SIGKILL);
-	while ((rv = waitpid(pid, &status, 0)) == -1 && errno == EINTR)
-	    ;
-    }
-
-    /* Reset SIGCHLD signal hander before returning */
-    sigaction(SIGCHLD, &oldact, NULL);
-
-    return status;
-}
-
-#ifdef DARWIN
-#include <TargetConditionals.h>
-#if !TARGET_OS_IPHONE
-#include <crt_externs.h>
-#endif
-#endif
-
-/* Fork netstat to collect its output by default. Do not unset this unless
- * another source of entropy is available
- */
-#define DO_NETSTAT 1
-
-void RNG_SystemInfoForRNG(void)
-{
-    FILE *fp;
-    char buf[BUFSIZ];
-    size_t bytes;
-    const char * const *cp;
-    char *randfile;
-#ifdef DARWIN
-#if TARGET_OS_IPHONE
-    /* iOS does not expose a way to access environ. */
-    char **environ = NULL;
-#else
-    char **environ = *_NSGetEnviron();
-#endif
-#else
-    extern char **environ;
-#endif
-#ifdef BEOS
-    static const char * const files[] = {
-	"/boot/var/swap",
-	"/boot/var/log/syslog",
-	"/boot/var/tmp",
-	"/boot/home/config/settings",
-	"/boot/home",
-	0
-    };
-#else
-    static const char * const files[] = {
-	"/etc/passwd",
-	"/etc/utmp",
-	"/tmp",
-	"/var/tmp",
-	"/usr/tmp",
-	0
-    };
-#endif
-
-#if defined(BSDI)
-    static char netstat_ni_cmd[] = "netstat -nis";
-#else
-    static char netstat_ni_cmd[] = "netstat -ni";
-#endif
-
-    GiveSystemInfo();
-
-    bytes = RNG_GetNoise(buf, sizeof(buf));
-    RNG_RandomUpdate(buf, bytes);
-
-    /*
-     * Pass the C environment and the addresses of the pointers to the
-     * hash function. This makes the random number function depend on the
-     * execution environment of the user and on the platform the program
-     * is running on.
-     */
-    if (environ != NULL) {
-        cp = (const char * const *) environ;
-        while (*cp) {
-	    RNG_RandomUpdate(*cp, strlen(*cp));
-	    cp++;
-        }
-        RNG_RandomUpdate(environ, (char*)cp - (char*)environ);
-    }
-
-    /* Give in system information */
-    if (gethostname(buf, sizeof(buf)) == 0) {
-	RNG_RandomUpdate(buf, strlen(buf));
-    }
-    GiveSystemInfo();
-
-    /* grab some data from system's PRNG before any other files. */
-    bytes = RNG_FileUpdate("/dev/urandom", SYSTEM_RNG_SEED_COUNT);
-
-    /* If the user points us to a random file, pass it through the rng */
-    randfile = PR_GetEnvSecure("NSRANDFILE");
-    if ( ( randfile != NULL ) && ( randfile[0] != '\0') ) {
-	char *randCountString = PR_GetEnvSecure("NSRANDCOUNT");
-	int randCount = randCountString ? atoi(randCountString) : 0;
-	if (randCount != 0) {
-	    RNG_FileUpdate(randfile, randCount);
-	} else {
-	    RNG_FileForRNG(randfile);
-	}
-    }
-
-    /* pass other files through */
-    for (cp = files; *cp; cp++)
-	RNG_FileForRNG(*cp);
-
-/*
- * Bug 100447: On BSD/OS 4.2 and 4.3, we have problem calling safe_popen
- * in a pthreads environment.  Therefore, we call safe_popen last and on
- * BSD/OS we do not call safe_popen when we succeeded in getting data
- * from /dev/urandom.
- *
- * Bug 174993: On platforms providing /dev/urandom, don't fork netstat
- * either, if data has been gathered successfully.
- */
-
-#if defined(BSDI) || defined(FREEBSD) || defined(NETBSD) \
-    || defined(OPENBSD) || defined(DARWIN) || defined(LINUX) \
-    || defined(HPUX)
-    if (bytes == SYSTEM_RNG_SEED_COUNT)
-        return;
-
-    /*
-     * Modified to abort the process if it failed to read from /dev/urandom.
-     *
-     * See crbug.com/244661 for details.
-     */
-    fprintf(stderr, "[ERROR:%s(%d)] NSS read %zu bytes (expected %d bytes) "
-            "from /dev/urandom. Abort process.\n", __FILE__, __LINE__,
-            bytes, SYSTEM_RNG_SEED_COUNT);
-    fflush(stderr);
-    abort();
-#endif
-
-#ifdef SOLARIS
-
-/*
- * On Solaris, NSS may be initialized automatically from libldap in
- * applications that are unaware of the use of NSS. safe_popen forks, and
- * sometimes creates issues with some applications' pthread_atfork handlers.
- * We always have /dev/urandom on Solaris 9 and above as an entropy source,
- * and for Solaris 8 we have the libkstat interface, so we don't need to
- * fork netstat.
- */
-
-#undef DO_NETSTAT
-    if (!bytes) {
-        /* On Solaris 8, /dev/urandom isn't available, so we use libkstat. */
-        PRUint32 kstat_bytes = 0;
-        if (SECSuccess != RNG_kstat(&kstat_bytes)) {
-            PORT_Assert(0);
-        }
-        bytes += kstat_bytes;
-        PORT_Assert(bytes);
-    }
-#endif
-
-#ifdef DO_NETSTAT
-    fp = safe_popen(netstat_ni_cmd);
-    if (fp != NULL) {
-	while ((bytes = fread(buf, 1, sizeof(buf), fp)) > 0)
-	    RNG_RandomUpdate(buf, bytes);
-	safe_pclose(fp);
-    }
-#endif
-
-}
-
-#define TOTAL_FILE_LIMIT 1000000	/* one million */
-
-size_t RNG_FileUpdate(const char *fileName, size_t limit)
-{
-    FILE *        file;
-    int           fd;
-    int           bytes;
-    size_t        fileBytes = 0;
-    struct stat   stat_buf;
-    unsigned char buffer[BUFSIZ];
-    static size_t totalFileBytes = 0;
-    
-    /* suppress valgrind warnings due to holes in struct stat */
-    memset(&stat_buf, 0, sizeof(stat_buf));
-
-    if (stat((char *)fileName, &stat_buf) < 0)
-	return fileBytes;
-    RNG_RandomUpdate(&stat_buf, sizeof(stat_buf));
-    
-    file = fopen(fileName, "r");
-    if (file != NULL) {
-	/* Read from the underlying file descriptor directly to bypass stdio
-	 * buffering and avoid reading more bytes than we need from
-	 * /dev/urandom. NOTE: we can't use fread with unbuffered I/O because
-	 * fread may return EOF in unbuffered I/O mode on Android.
-	 *
-	 * Moreover, we read into a buffer of size BUFSIZ, so buffered I/O
-	 * has no performance advantage. */
-	fd = fileno(file);
-	/* 'file' was just opened, so this should not fail. */
-	PORT_Assert(fd != -1);
-	while (limit > fileBytes) {
-	    bytes = PR_MIN(sizeof buffer, limit - fileBytes);
-	    bytes = read(fd, buffer, bytes);
-	    if (bytes <= 0)
-		break;
-	    RNG_RandomUpdate(buffer, bytes);
-	    fileBytes      += bytes;
-	    totalFileBytes += bytes;
-	    /* after TOTAL_FILE_LIMIT has been reached, only read in first
-	    ** buffer of data from each subsequent file.
-	    */
-	    if (totalFileBytes > TOTAL_FILE_LIMIT) 
-		break;
-	}
-	fclose(file);
-    }
-    /*
-     * Pass yet another snapshot of our highest resolution clock into
-     * the hash function.
-     */
-    bytes = RNG_GetNoise(buffer, sizeof(buffer));
-    RNG_RandomUpdate(buffer, bytes);
-    return fileBytes;
-}
-
-void RNG_FileForRNG(const char *fileName)
-{
-    RNG_FileUpdate(fileName, TOTAL_FILE_LIMIT);
-}
-
-void ReadSingleFile(const char *fileName)
-{
-    FILE *        file;
-    unsigned char buffer[BUFSIZ];
-    
-    file = fopen(fileName, "rb");
-    if (file != NULL) {
-	while (fread(buffer, 1, sizeof(buffer), file) > 0)
-	    ;
-	fclose(file);
-    } 
-}
-
-#define _POSIX_PTHREAD_SEMANTICS
-#include <dirent.h>
-
-PRBool
-ReadFileOK(char *dir, char *file)
-{
-    struct stat   stat_buf;
-    char filename[PATH_MAX];
-    int count = snprintf(filename, sizeof filename, "%s/%s",dir, file);
-
-    if (count <= 0) {
-	return PR_FALSE; /* name too long, can't read it anyway */
-    }
-    
-    if (stat(filename, &stat_buf) < 0)
-	return PR_FALSE; /* can't stat, probably can't read it then as well */
-    return S_ISREG(stat_buf.st_mode) ? PR_TRUE : PR_FALSE;
-}
-
-/*
- * read one file out of either /etc or the user's home directory.
- * fileToRead tells which file to read.
- *
- * return 1 if it's time to reset the fileToRead (no more files to read).
- */
-int ReadOneFile(int fileToRead)
-{
-    char *dir = "/etc";
-    DIR *fd = opendir(dir);
-    int resetCount = 0;
-#ifdef SOLARIS
-     /* grumble, Solaris does not define struct dirent to be the full length */
-    typedef union {
-	unsigned char space[sizeof(struct dirent) + MAXNAMELEN];
-	struct dirent dir;
-    } dirent_hack;
-    dirent_hack entry, firstEntry;
-
-#define entry_dir entry.dir
-#else
-    struct dirent entry, firstEntry;
-#define entry_dir entry
-#endif
-
-    int i, error = -1;
-
-    if (fd == NULL) {
-	dir = PR_GetEnvSecure("HOME");
-	if (dir) {
-	    fd = opendir(dir);
-	}
-    }
-    if (fd == NULL) {
-	return 1;
-    }
-
-    for (i=0; i <= fileToRead; i++) {
-	struct dirent *result = NULL;
-	do {
-	    error = readdir_r(fd, &entry_dir, &result);
-	} while (error == 0 && result != NULL  &&
-					!ReadFileOK(dir,&result->d_name[0]));
-	if (error != 0 || result == NULL)  {
-	    resetCount = 1; /* read to the end, start again at the beginning */
-	    if (i != 0) {
-		/* ran out of entries in the directory, use the first one */
-	 	entry = firstEntry;
-	 	error = 0;
-	 	break;
-	    }
-	    /* if i== 0, there were no readable entries in the directory */
-	    break;
-	}
-	if (i==0) {
-	    /* save the first entry in case we run out of entries */
-	    firstEntry = entry;
-	}
-    }
-
-    if (error == 0) {
-	char filename[PATH_MAX];
-	int count = snprintf(filename, sizeof filename, 
-				"%s/%s",dir, &entry_dir.d_name[0]);
-	if (count >= 1) {
-	    ReadSingleFile(filename);
-	}
-    } 
-
-    closedir(fd);
-    return resetCount;
-}
-
-/*
- * do something to try to introduce more noise into the 'GetNoise' call
- */
-static void rng_systemJitter(void)
-{
-   static int fileToRead = 1;
-
-   if (ReadOneFile(fileToRead)) {
-	fileToRead = 1;
-   } else {
-	fileToRead++;
-   }
-}
-
-/*
- * Modified to abort the process if it failed to read from /dev/urandom.
- *
- * See crbug.com/244661 for details.
- */
-size_t RNG_SystemRNG(void *dest, size_t maxLen)
-{
-    FILE *file;
-    int fd;
-    int bytes;
-    size_t fileBytes = 0;
-    unsigned char *buffer = dest;
-
-    file = fopen("/dev/urandom", "r");
-    if (file == NULL) {
-	fprintf(stderr, "[ERROR:%s(%d)] NSS failed to read from /dev/urandom. "
-		"Abort process.\n", __FILE__, __LINE__);
-	fflush(stderr);
-	abort();
-    }
-    /* Read from the underlying file descriptor directly to bypass stdio
-     * buffering and avoid reading more bytes than we need from /dev/urandom.
-     * NOTE: we can't use fread with unbuffered I/O because fread may return
-     * EOF in unbuffered I/O mode on Android.
-     */
-    fd = fileno(file);
-    /* 'file' was just opened, so this should not fail. */
-    PORT_Assert(fd != -1);
-    while (maxLen > fileBytes) {
-	bytes = maxLen - fileBytes;
-	bytes = read(fd, buffer, bytes);
-	if (bytes <= 0)
-	    break;
-	fileBytes += bytes;
-	buffer += bytes;
-    }
-    fclose(file);
-    if (fileBytes != maxLen) {
-	fprintf(stderr, "[ERROR:%s(%d)] NSS failed to read from /dev/urandom. "
-		"Abort process.\n", __FILE__, __LINE__);
-	fflush(stderr);
-	abort();
-    }
-    return fileBytes;
-}