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terminal-util: add recognizable error if cols/rows of tty are initially not initialized

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Various tty types come up with cols/rows not initialized (i.e. set to
zero). Let's detect these cases, and return a better error than EIO,
simply to make things easier to debug.
This commit is contained in:
Lennart Poettering 2024-07-17 17:45:26 +02:00
parent ad2fa21f83
commit 0ea4198f0a
1 changed files with 2 additions and 2 deletions
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4
src/basic/terminal-util.c
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@ -855,7 +855,7 @@ int fd_columns(int fd) {
return -errno;
if (ws.ws_col <= 0)
return -EIO;
return -ENODATA; /* some tty types come up with invalid row/column initially, return a recognizable error for that */
return ws.ws_col;
}
@ -892,7 +892,7 @@ int fd_lines(int fd) {
return -errno;
if (ws.ws_row <= 0)
return -EIO;
return -ENODATA; /* some tty types come up with invalid row/column initially, return a recognizable error for that */
return ws.ws_row;
}