07-11-2019
The -a options of tee appends the output to the file rather than overwriting the file.
Your > $logfile code overwrites the file.
There may be more subtle differences I am not familiar with off the top of my head.
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buffer_get_token_sa
buffer_get_token_sa(3) Library Functions Manual buffer_get_token_sa(3)
NAME
buffer_get_token_sa - read token from buffer
SYNTAX
#include <stralloc.h>
#include <buffer.h>
int buffer_get_token_sa(buffer* b,stralloc* sa,
const char* charset,size_t setlen);
DESCRIPTION
buffer_get_token_sa appends data from the b to sa until one of the delimiters in charset is found, NOT overwriting the previous content of
sa. That delimiter is also appended to sa.
If reading from the buffer or allocating memory fails, buffer_get_token_sa returns -1 and sets errno appropriately. At that point sa may
already contain a partial token.
RETURN VALUE
-1 on error (setting errno), 0 on EOF, 1 when successful.
RATIONALE
buffer_get_token_sa appends instead of overwriting so it can be used on non-blocking sockets (these signal error and set errno to EAGAIN;
in this case you can simply call buffer_get_token_sa again when select or poll indicate more data is available).
SEE ALSO
buffer_getline_sa(3), buffer_get_token(3), buffer(3)
buffer_get_token_sa(3)