explain_wait(3) | Library Functions Manual | explain_wait(3) |
explain_wait - explain wait(2) errors
#include <libexplain/wait.h>
const char *explain_wait(int *status);
const char *explain_errno_wait(int errnum, int *status);
void explain_message_wait(char *message, int message_size, int *status);
void explain_message_errno_wait(char *message, int message_size, int errnum,
int *status);
These functions may be used to obtain explanations for errors returned by the wait(2) system call.
const char *explain_wait(int *status);
The explain_wait function is used to obtain an explanation of an error returned by the wait(2) system call. The least the message will contain is the value of strerror(errno), but usually it will do much better, and indicate the underlying cause in more detail.
The errno global variable will be used to obtain the error value to be decoded.
This function is intended to be used in a fashion similar to the following example:
if (wait(status) < 0) {
fprintf(stderr, "%s\n", explain_wait(status));
exit(EXIT_FAILURE); }
Note: This function is not thread safe, because it shares a return buffer across all threads, and many other functions in this library.
const char *explain_errno_wait(int errnum, int *status);
The explain_errno_wait function is used to obtain an explanation of an error returned by the wait(2) system call. The least the message will contain is the value of strerror(errnum), but usually it will do much better, and indicate the underlying cause in more detail.
This function is intended to be used in a fashion similar to the following example:
if (wait(status) < 0) {
int err = errno;
fprintf(stderr, "%s\n", explain_errno_wait(err, status));
exit(EXIT_FAILURE); }
Note: This function is not thread safe, because it shares a return buffer across all threads, and many other functions in this library.
void explain_message_wait(char *message, int message_size, int *status);
The explain_message_wait function may be used to obtain an explanation of an error returned by the wait(2) system call. The least the message will contain is the value of strerror(errno), but usually it will do much better, and indicate the underlying cause in more detail.
The errno global variable will be used to obtain the error value to be decoded.
This function is intended to be used in a fashion similar to the following example:
if (wait(status) < 0) {
char message[3000];
explain_message_wait(message, sizeof(message), status);
fprintf(stderr, "%s\n", message);
exit(EXIT_FAILURE); }
void explain_message_errno_wait(char *message, int message_size, int errnum, int *status);
The explain_message_errno_wait function may be used to obtain an explanation of an error returned by the wait(2) system call. The least the message will contain is the value of strerror(errnum), but usually it will do much better, and indicate the underlying cause in more detail.
This function is intended to be used in a fashion similar to the following example:
if (wait(status) < 0) {
int err = errno;
char message[3000];
explain_message_errno_wait(message, sizeof(message), err, status);
fprintf(stderr, "%s\n", message);
exit(EXIT_FAILURE); }
libexplain version 1.4
Copyright (C) 2008 Peter Miller