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error_functions.c
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error_functions.c
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#include <stdarg.h>
#include "error_functions.h"
#include "tlpi_hdr.h"
#include "ename.c.inc"
#ifdef __GNUC__
__attribute__ ((__noreturn__)) #endif
static void
terminate(Boolean useExit3)
{
char *s;
/* Defines ename and MAX_ENAME */
/* Dump core if EF_DUMPCORE environment variable is defined and is a nonempty string; otherwise call exit(3) or _exit(2), depending on the value of 'useExit3'. */
s = getenv("EF_DUMPCORE");
if (s != NULL && *s != '\0')
abort();
else if (useExit3)
exit(EXIT_FAILURE);
else
_exit(EXIT_FAILURE);
}
54 Chapter 3
static void
outputError(Boolean useErr, int err, Boolean flushStdout,
const char *format, va_list ap)
{
#define BUF_SIZE 500
char buf[BUF_SIZE], userMsg[BUF_SIZE], errText[BUF_SIZE];
vsnprintf(userMsg, BUF_SIZE, format, ap);
if (useErr)
snprintf(errText, BUF_SIZE, " [%s %s]",
(err > 0 && err <= MAX_ENAME) ? ename[err] : "?UNKNOWN?", strerror(err));
else
snprintf(errText, BUF_SIZE, ":");
snprintf(buf, BUF_SIZE, "ERROR%s %s\n", errText, userMsg);
}
if (flushStdout)
fflush(stdout);
fputs(buf, stderr);
fflush(stderr);
/* Flush any pending stdout */
/* In case stderr is not line-buffered */
void
errMsg(const char *format, ...)
{
va_list argList;
int savedErrno;
savedErrno = errno; /* In case we change it here */
va_start(argList, format);
outputError(TRUE, errno, TRUE, format, argList); va_end(argList);
errno = savedErrno;
}
void
errExit(const char *format, ...)
{
va_list argList;
va_start(argList, format);
outputError(TRUE, errno, TRUE, format, argList); va_end(argList);
terminate(TRUE);
}
System Programming Concepts 55
56 Chapter 3
void
err_exit(const char *format, ...) {
va_list argList;
va_start(argList, format);
outputError(TRUE,
va_end(argList);
terminate(FALSE);
}
void
errExitEN(int errnum,
{
va_list argList;
errno, FALSE, format, argList);
const char *format, ...)
va_start(argList, format);
outputError(TRUE, errnum, TRUE, format, argList); va_end(argList);
terminate(TRUE);
}
void
fatal(const char *format, ...)
{
va_list argList;
va_start(argList, format);
outputError(FALSE, 0, TRUE, format, argList); va_end(argList);
terminate(TRUE);
}
void
usageErr(const char *format, ...) {
va_list argList;
fflush(stdout); /* Flush any pending stdout */
fprintf(stderr, "Usage: "); va_start(argList, format); vfprintf(stderr, format, argList); va_end(argList);
fflush(stderr); /* In case stderr is not line-buffered */
exit(EXIT_FAILURE);
}
void
cmdLineErr(const char *format, ...)
{
va_list argList;
fflush(stdout); /* Flush any pending stdout */
fprintf(stderr, "Command-line usage error: "); va_start(argList, format);
vfprintf(stderr, format, argList); va_end(argList);
fflush(stderr); /* In case stderr is not line-buffered */
exit(EXIT_FAILURE);
}