libexplain  1.4.D001
Functions
libexplain/buffer/errno/dup2.h File Reference
#include <libexplain/string_buffer.h>

Go to the source code of this file.

Functions

void explain_buffer_errno_dup2 (explain_string_buffer_t *sb, int errnum, int oldfd, int newfd)

Function Documentation

void explain_buffer_errno_dup2 ( explain_string_buffer_t sb,
int  errnum,
int  oldfd,
int  newfd 
)

The explain_buffer_errno_dup2 function is used to obtain an explanation of an error returned by the dup2(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.

Parameters:
sbThe string buffer to print the message into. If a safe buffer is specified, this function is thread safe.
errnumThe error value to be decoded, usually obtained from the errno global variable just before this function is called. This is necessary if you need to call any code between the system call to be explained and this function, because many libc functions will alter the value of errno.
oldfdThe original oldfd, exactly as passed to the dup2(2) system call.
newfdThe original newfd, exactly as passed to the dup2(2) system call.

Definition at line 132 of file dup2.c.