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| author | Jan Kratochvil <jan.kratochvil@redhat.com> | 2008-09-12 08:44:30 +0000 |
|---|---|---|
| committer | Jan Kratochvil <jan.kratochvil@redhat.com> | 2008-09-12 08:44:30 +0000 |
| commit | 14256a7d2634f40f67ccbf73e163d022f5268d55 (patch) | |
| tree | 34164c43fd35da8677a312630ecd36cfe73ebc06 /strace.1 | |
| parent | 21a75347451b5178a0eb85a48042b8db0e45b318 (diff) | |
| download | strace-14256a7d2634f40f67ccbf73e163d022f5268d55.tar.gz strace-14256a7d2634f40f67ccbf73e163d022f5268d55.tar.bz2 strace-14256a7d2634f40f67ccbf73e163d022f5268d55.tar.xz | |
2008-09-12 Tomas Pospisek <tpo@sourcepole.ch>
Jan Kratochvil <jan.kratochvil@redhat.com>
* strace.1 (DESCRIPTION): New description of unfinished system calls
and system calls restarting.
Diffstat (limited to 'strace.1')
| -rw-r--r-- | strace.1 | 20 |
1 files changed, 20 insertions, 0 deletions
@@ -147,6 +147,26 @@ sigsuspend([] <unfinished ...> --- SIGINT (Interrupt) --- +++ killed by SIGINT +++ .CE +If a system call is being executed and meanwhile another one is being called +from a different thread/process then +.B strace +will try to preserve the order of those events and mark the ongoing call as +being \fIunfinished\fP. When the call returns it will be marked as +\fIresumed\fP. +.CW +[pid 28772] select(4, [3], NULL, NULL, NULL <unfinished ...> +[pid 28779] clock_gettime(CLOCK_REALTIME, {1130322148, 939977000}) = 0 +[pid 28772] <... select resumed> ) = 1 (in [3]) +.CE +Interruption of a (restartable) system call by a signal delivery is processed +differently as kernel terminates the system call and also arranges its +immediate reexecution after the signal handler completes. +.CW +read(0, 0x7ffff72cf5cf, 1) = ? ERESTARTSYS (To be restarted) +--- SIGALRM (Alarm clock) @ 0 (0) --- +rt_sigreturn(0xe) = 0 +read(0, ""..., 1) = 0 +.CE Arguments are printed in symbolic form with a passion. This example shows the shell performing ``>>xyzzy'' output redirection: .CW |