| Summary: |
rootless X doesn't start if stderr redirected |
| Product: |
xorg
|
Reporter: |
Olivier Brunel (jjacky) <jjk> |
| Component: |
Server/General | Assignee: |
Xorg Project Team <xorg-team> |
| Status: |
RESOLVED
MOVED
|
QA Contact: |
Xorg Project Team <xorg-team> |
| Severity: |
normal
|
|
|
| Priority: |
medium
|
CC: |
karol.blazewicz
|
| Version: |
unspecified | |
|
| Hardware: |
Other | |
|
| OS: |
Linux (All) | |
|
| Whiteboard: |
|
|
i915 platform:
|
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i915 features:
|
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|---|
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Trying to start a rootless X while redirecting stderr will fail: (EE) xf86OpenConsole: VT_ACTIVATE failed: Operation not permitted Looking into this, it turns out this is because X failed to see that the current tty was the vt we're starting on and to auto-enable KeepTty, which led to the mentionned permission error. The issue comes from the following, in hw/xfree86/os-support/linux/lnx_init.c +130: /* Some of stdin / stdout / stderr maybe redirected to a file */ for (i = STDIN_FILENO; i <= STDERR_FILENO; i++) { ret = fstat(i, &st); if (ret == 0 && S_ISCHR(st.st_mode) && major(st.st_rdev) == 4) { current_vt = minor(st.st_rdev); break; } } Specifically, I believe in os/osinit.c both stdin and stdout were closed, so the fstat() calls here for 0 and 1 aren't about stdin/stdout but other things (0 seems to be the Xorg log file, and 1 a socket), which leaves only stderr to give valid/expected results. And obviously, redirecting it to a file will cause the issue. (Note that as a simple workaround, one can use the -keeptty option.)