#include "usg_common.h"
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#include "bus_error.h"
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#define MAX_ERROR_LEN 256 /* Maximum length of string in per-thread
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buffer returned by strerror() */
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#define _bus_nerr 256
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int bus_errno;
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static pthread_once_t once = PTHREAD_ONCE_INIT;
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static pthread_key_t strerrorKey;
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static char *_bus_errlist[_bus_nerr] = {
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"\0",
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"timeout",
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"The other end is not inline",
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"Key already in use"
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};
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static void /* Free thread-specific data buffer */
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destructor(void *buf)
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{
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free(buf);
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}
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static void /* One-time key creation function */
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createKey(void)
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{
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int s;
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/* Allocate a unique thread-specific data key and save the address
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of the destructor for thread-specific data buffers */
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s = pthread_key_create(&strerrorKey, destructor);
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if (s != 0)
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err_exit(s, "pthread_key_create");
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}
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char *
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bus_strerror(int err)
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{
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int s, eindex;
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char *buf;
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eindex = err - 10000;
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/* Make first caller allocate key for thread-specific data */
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s = pthread_once(&once, createKey);
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if (s != 0)
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err_exit(s, "pthread_once");
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buf = (char *)pthread_getspecific(strerrorKey);
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if (buf == NULL)
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{
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/* If first call from this thread, allocate
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buffer for thread, and save its location */
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buf = (char *)malloc(MAX_ERROR_LEN);
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if (buf == NULL)
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err_exit(errno, "malloc");
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s = pthread_setspecific(strerrorKey, buf);
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if (s != 0)
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err_exit(s, "pthread_setspecific");
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}
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if (eindex < 0 || eindex >= _bus_nerr || _bus_errlist[eindex] == NULL)
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{
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snprintf(buf, MAX_ERROR_LEN, "Unknown error %d", eindex);
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}
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else
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{
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strncpy(buf, _bus_errlist[eindex], MAX_ERROR_LEN - 1);
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buf[MAX_ERROR_LEN - 1] = '\0'; /* Ensure null termination */
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}
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return buf;
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}
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