diff options
| author | Denis Vlasenko <vda.linux@googlemail.com> | 2007-04-19 17:26:34 +0000 |
|---|---|---|
| committer | Denis Vlasenko <vda.linux@googlemail.com> | 2007-04-19 17:26:34 +0000 |
| commit | 05a6d9cbb202b8aa7379e39dfd09baccfbfc6c4b (patch) | |
| tree | b520bc162f092155e277ccd1151ca370529ccdd5 | |
| parent | 8581863a1b536e2db20036e680b58cc07c54ad55 (diff) | |
| download | busybox-05a6d9cbb202b8aa7379e39dfd09baccfbfc6c4b.tar.gz | |
doc: add README on shell job control
| -rw-r--r-- | shell/README.job | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/shell/README.job b/shell/README.job new file mode 100644 index 000000000..b29d31588 --- /dev/null +++ b/shell/README.job @@ -0,0 +1,237 @@ +strace of "sleep 1 | sleep 2" being run from interactive bash 3.0 + + +Synopsis: +get current signal mask +install default handlers for GHLD QUIT TERM +install common handler for HUP INT ILL TRAP ABRT FPE BUS SEGV SYS PIPE ALRM TERM XCPU XFSZ VTALRM USR1 USR2 +ignore QUIT +install handler for INT +ignore TERM +install handler for INT +ignore TSTP TTOU TTIN +install handler for WINCH +get pid, ppid +block all signals +unblock all signals +get our pprocess group + minidoc: + Each process group is a member of a session and each process is a member + of the session of which its process group is a member. + Process groups are used for distribution of signals, and by terminals + to arbitrate requests for their input: processes that have the same + process group as the terminal are foreground and may read, while others + will block with a signal if they attempt to read. These calls are thus used + by programs (shells) to create process groups in implementing job control. + The TIOCGPGRP and TIOCSPGRP calls described in termios(3) are used to get/set + the process group of the control terminal. + If a session has a controlling terminal, CLOCAL is not set and a hangup occurs, + then the session leader is sent a SIGHUP. If the session leader exits, + the SIGHUP signal will be sent to each process in the foreground process + group of the controlling terminal. + If the exit of the process causes a process group to become orphaned, + and if any member of the newly-orphaned process group is stopped, then a SIGHUP + signal followed by a SIGCONT signal will be sent to each process + in the newly-orphaned process group. +... + + + +execve("/bin/sh", ["sh"], [/* 34 vars */]) = 0 +rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 +rt_sigaction(SIGCHLD, {SIG_DFL}, {SIG_DFL}, 8) = 0 +rt_sigaction(SIGQUIT, {SIG_DFL}, {SIG_DFL}, 8) = 0 +rt_sigaction(SIGTERM, {SIG_DFL}, {SIG_DFL}, 8) = 0 +rt_sigaction(SIGHUP, {0x808f752, [HUP INT ILL TRAP ABRT BUS FPE USR1 SEGV USR2 PIPE ALRM TERM XCPU XFSZ VTALRM SYS], SA_RESTORER, 0x6ff7a4f8}, {SIG_DFL}, 8) = 0 +rt_sigaction(SIGINT, {0x808f752, [HUP INT ILL TRAP ABRT BUS FPE USR1 SEGV USR2 PIPE ALRM TERM XCPU XFSZ VTALRM SYS], SA_RESTORER, 0x6ff7a4f8}, {SIG_DFL}, 8) = 0 +rt_sigaction(SIGILL, {0x808f752, [HUP INT ILL TRAP ABRT BUS FPE USR1 SEGV USR2 PIPE ALRM TERM XCPU XFSZ VTALRM SYS], SA_RESTORER, 0x6ff7a4f8}, {SIG_DFL}, 8) = 0 +rt_sigaction(SIGTRAP, {0x808f752, [HUP INT ILL TRAP ABRT BUS FPE USR1 SEGV USR2 PIPE ALRM TERM XCPU XFSZ VTALRM SYS], SA_RESTORER, 0x6ff7a4f8}, {SIG_DFL}, 8) = 0 +rt_sigaction(SIGABRT, {0x808f752, [HUP INT ILL TRAP ABRT BUS FPE USR1 SEGV USR2 PIPE ALRM TERM XCPU XFSZ VTALRM SYS], SA_RESTORER, 0x6ff7a4f8}, {SIG_DFL}, 8) = 0 +rt_sigaction(SIGFPE, {0x808f752, [HUP INT ILL TRAP ABRT BUS FPE USR1 SEGV USR2 PIPE ALRM TERM XCPU XFSZ VTALRM SYS], SA_RESTORER, 0x6ff7a4f8}, {SIG_DFL}, 8) = 0 +rt_sigaction(SIGBUS, {0x808f752, [HUP INT ILL TRAP ABRT BUS FPE USR1 SEGV USR2 PIPE ALRM TERM XCPU XFSZ VTALRM SYS], SA_RESTORER, 0x6ff7a4f8}, {SIG_DFL}, 8) = 0 +rt_sigaction(SIGSEGV, {0x808f752, [HUP INT ILL TRAP ABRT BUS FPE USR1 SEGV USR2 PIPE ALRM TERM XCPU XFSZ VTALRM SYS], SA_RESTORER, 0x6ff7a4f8}, {SIG_DFL}, 8) = 0 +rt_sigaction(SIGSYS, {0x808f752, [HUP INT ILL TRAP ABRT BUS FPE USR1 SEGV USR2 PIPE ALRM TERM XCPU XFSZ VTALRM SYS], SA_RESTORER, 0x6ff7a4f8}, {SIG_DFL}, 8) = 0 +rt_sigaction(SIGPIPE, {0x808f752, [HUP INT ILL TRAP ABRT BUS FPE USR1 SEGV USR2 PIPE ALRM TERM XCPU XFSZ VTALRM SYS], SA_RESTORER, 0x6ff7a4f8}, {SIG_DFL}, 8) = 0 +rt_sigaction(SIGALRM, {0x808f752, [HUP INT ILL TRAP ABRT BUS FPE USR1 SEGV USR2 PIPE ALRM TERM XCPU XFSZ VTALRM SYS], SA_RESTORER, 0x6ff7a4f8}, {SIG_DFL}, 8) = 0 +rt_sigaction(SIGTERM, {0x808f752, [HUP INT ILL TRAP ABRT BUS FPE USR1 SEGV USR2 PIPE ALRM TERM XCPU XFSZ VTALRM SYS], SA_RESTORER, 0x6ff7a4f8}, {SIG_DFL}, 8) = 0 +rt_sigaction(SIGXCPU, {0x808f752, [HUP INT ILL TRAP ABRT BUS FPE USR1 SEGV USR2 PIPE ALRM TERM XCPU XFSZ VTALRM SYS], SA_RESTORER, 0x6ff7a4f8}, {SIG_DFL}, 8) = 0 +rt_sigaction(SIGXFSZ, {0x808f752, [HUP INT ILL TRAP ABRT BUS FPE USR1 SEGV USR2 PIPE ALRM TERM XCPU XFSZ VTALRM SYS], SA_RESTORER, 0x6ff7a4f8}, {SIG_DFL}, 8) = 0 +rt_sigaction(SIGVTALRM, {0x808f752, [HUP INT ILL TRAP ABRT BUS FPE USR1 SEGV USR2 PIPE ALRM TERM XCPU XFSZ VTALRM SYS], SA_RESTORER, 0x6ff7a4f8}, {SIG_DFL}, 8) = 0 +rt_sigaction(SIGUSR1, {0x808f752, [HUP INT ILL TRAP ABRT BUS FPE USR1 SEGV USR2 PIPE ALRM TERM XCPU XFSZ VTALRM SYS], SA_RESTORER, 0x6ff7a4f8}, {SIG_DFL}, 8) = 0 +rt_sigaction(SIGUSR2, {0x808f752, [HUP INT ILL TRAP ABRT BUS FPE USR1 SEGV USR2 PIPE ALRM TERM XCPU XFSZ VTALRM SYS], SA_RESTORER, 0x6ff7a4f8}, {SIG_DFL}, 8) = 0 +rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 +rt_sigaction(SIGQUIT, {SIG_IGN}, {SIG_DFL}, 8) = 0 +rt_sigaction(SIGINT, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, {0x808f752, [HUP INT ILL TRAP ABRT BUS FPE USR1 SEGV USR2 PIPE ALRM TERM XCPU XFSZ VTALRM SYS], SA_RESTORER, 0x6ff7a4f8}, 8) = 0 +rt_sigaction(SIGTERM, {SIG_IGN}, {0x808f752, [HUP INT ILL TRAP ABRT BUS FPE USR1 SEGV USR2 PIPE ALRM TERM XCPU XFSZ VTALRM SYS], SA_RESTORER, 0x6ff7a4f8}, 8) = 0 +rt_sigaction(SIGINT, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0 +rt_sigaction(SIGTSTP, {SIG_IGN}, {SIG_DFL}, 8) = 0 +rt_sigaction(SIGTTOU, {SIG_IGN}, {SIG_DFL}, 8) = 0 +rt_sigaction(SIGTTIN, {SIG_IGN}, {SIG_DFL}, 8) = 0 +rt_sigaction(SIGWINCH, {0x807dc33, [], SA_RESTORER, 0x6ff7a4f8}, {SIG_DFL}, 8) = 0 +getpid() = 19473 +getppid() = 19472 +rt_sigprocmask(SIG_BLOCK, ~[], [], 8) = 0 +rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 +getpgrp() = 1865 +dup(2) = 4 +fcntl64(255, F_GETFD) = -1 EBADF (Bad file descriptor) +dup2(4, 255) = 255 +close(4) = 0 +ioctl(255, TIOCGPGRP, [1865]) = 0 +getpid() = 19473 +setpgid(0, 19473) = 0 +rt_sigprocmask(SIG_BLOCK, [CHLD TSTP TTIN TTOU], [], 8) = 0 +ioctl(255, TIOCSPGRP, [19473]) = 0 +rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 +fcntl64(255, F_SETFD, FD_CLOEXEC) = 0 +rt_sigaction(SIGCHLD, {0x807c922, [], SA_RESTORER, 0x6ff7a4f8}, {SIG_DFL}, 8) = 0 +rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 +fcntl64(0, F_GETFL) = 0x2 (flags O_RDWR) +... +rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 +rt_sigaction(SIGINT, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0 +rt_sigprocmask(SIG_BLOCK, [CHLD TSTP TTIN TTOU], [], 8) = 0 +ioctl(255, TIOCSPGRP, [19473]) = 0 +rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 +rt_sigaction(SIGINT, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0 +rt_sigprocmask(SIG_BLOCK, ~[], [], 8) = 0 +rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 +rt_sigprocmask(SIG_BLOCK, [INT], [], 8) = 0 +rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 +rt_sigaction(SIGINT, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0 +rt_sigaction(SIGTERM, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, {SIG_IGN}, 8) = 0 +rt_sigaction(SIGTERM, {SIG_IGN}, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0 +rt_sigaction(SIGQUIT, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, {SIG_IGN}, 8) = 0 +rt_sigaction(SIGQUIT, {SIG_IGN}, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0 +rt_sigaction(SIGALRM, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, {0x808f752, [HUP INT ILL TRAP ABRT BUS FPE USR1 SEGV USR2 PIPE ALRM TERM XCPU XFSZ VTALRM SYS], SA_RESTORER, 0x6ff7a4f8}, 8) = 0 +rt_sigaction(SIGTSTP, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, {SIG_IGN}, 8) = 0 +rt_sigaction(SIGTSTP, {SIG_IGN}, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0 +rt_sigaction(SIGTTOU, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, {SIG_IGN}, 8) = 0 +rt_sigaction(SIGTTOU, {SIG_IGN}, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0 +rt_sigaction(SIGTTIN, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, {SIG_IGN}, 8) = 0 +rt_sigaction(SIGTTIN, {SIG_IGN}, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0 +rt_sigaction(SIGWINCH, {0x80ca5cd, [], SA_RESTORER|SA_RESTART, 0x6ff7a4f8}, {0x807dc33, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0 +rt_sigprocmask(SIG_BLOCK, ~[], [], 8) = 0 +rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 +rt_sigprocmask(SIG_BLOCK, ~[], [], 8) = 0 +rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 +rt_sigprocmask(SIG_BLOCK, ~[], [], 8) = 0 +rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 +write(2, "sh-3.00# ", 9) = 9 +rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 +read(0, "s", 1) = 1 +write(2, "s", 1) = 1 +rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 +read(0, "l", 1) = 1 +write(2, "l", 1) = 1 +rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 +... rest of "sleep 1 | sleep 2" entered... +rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 +read(0, "2", 1) = 1 +write(2, "2", 1) = 1 +rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 +read(0, "\r", 1) = 1 +write(2, "\n", 1) = 1 +rt_sigprocmask(SIG_BLOCK, [INT], [], 8) = 0 +ioctl(0, SNDCTL_TMR_STOP or TCSETSW, {B38400 opost isig icanon echo ...}) = 0 +rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 +rt_sigaction(SIGINT, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0 +rt_sigaction(SIGTERM, {SIG_IGN}, {SIG_IGN}, 8) = 0 +rt_sigaction(SIGQUIT, {SIG_IGN}, {SIG_IGN}, 8) = 0 +rt_sigaction(SIGALRM, {0x808f752, [HUP INT ILL TRAP ABRT BUS FPE USR1 SEGV USR2 PIPE ALRM TERM XCPU XFSZ VTALRM SYS], SA_RESTORER, 0x6ff7a4f8}, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0 +rt_sigaction(SIGTSTP, {SIG_IGN}, {SIG_IGN}, 8) = 0 +rt_sigaction(SIGTTOU, {SIG_IGN}, {SIG_IGN}, 8) = 0 +rt_sigaction(SIGTTIN, {SIG_IGN}, {SIG_IGN}, 8) = 0 +rt_sigaction(SIGWINCH, {0x807dc33, [], SA_RESTORER, 0x6ff7a4f8}, {0x80ca5cd, [], SA_RESTORER|SA_RESTART, 0x6ff7a4f8}, 8) = 0 +rt_sigaction(SIGINT, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0 +rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0 +pipe([4, 5]) = 0 +rt_sigprocmask(SIG_BLOCK, [INT CHLD], [CHLD], 8) = 0 +fork() = 19755 +setpgid(19755, 19755) = 0 +rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0 +close(5) = 0 +rt_sigprocmask(SIG_BLOCK, [INT CHLD], [CHLD], 8) = 0 +fork() = 19756 +setpgid(19756, 19755) = 0 +rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0 +close(4) = 0 +rt_sigprocmask(SIG_BLOCK, [CHLD], [CHLD], 8) = 0 +rt_sigprocmask(SIG_BLOCK, [CHLD TSTP TTIN TTOU], [CHLD], 8) = 0 +ioctl(255, TIOCSPGRP, [19755]) = 0 +rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0 +rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0 +rt_sigprocmask(SIG_BLOCK, [CHLD], [CHLD], 8) = 0 +wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], WUNTRACED, NULL) = 19755 +wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], WUNTRACED, NULL) = 19756 +rt_sigprocmask(SIG_BLOCK, [CHLD TSTP TTIN TTOU], [CHLD], 8) = 0 +ioctl(255, TIOCSPGRP, [19473]) = 0 +rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0 +rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0 +rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 +--- SIGCHLD (Child exited) @ 0 (0) --- +wait4(-1, 0x77fc9c54, WNOHANG|WUNTRACED, NULL) = -1 ECHILD (No child processes) +sigreturn() = ? (mask now []) +rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 +rt_sigaction(SIGINT, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0 +rt_sigprocmask(SIG_BLOCK, [CHLD TSTP TTIN TTOU], [], 8) = 0 +ioctl(255, TIOCSPGRP, [19473]) = 0 +rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 +rt_sigaction(SIGINT, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0 +rt_sigprocmask(SIG_BLOCK, [INT], [], 8) = 0 +rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 +rt_sigaction(SIGINT, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0 +rt_sigaction(SIGTERM, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, {SIG_IGN}, 8) = 0 +rt_sigaction(SIGTERM, {SIG_IGN}, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0 +rt_sigaction(SIGQUIT, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, {SIG_IGN}, 8) = 0 +rt_sigaction(SIGQUIT, {SIG_IGN}, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0 +rt_sigaction(SIGALRM, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, {0x808f752, [HUP INT ILL TRAP ABRT BUS FPE USR1 SEGV USR2 PIPE ALRM TERM XCPU XFSZ VTALRM SYS], SA_RESTORER, 0x6ff7a4f8}, 8) = 0 +rt_sigaction(SIGTSTP, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, {SIG_IGN}, 8) = 0 +rt_sigaction(SIGTSTP, {SIG_IGN}, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0 +rt_sigaction(SIGTTOU, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, {SIG_IGN}, 8) = 0 +rt_sigaction(SIGTTOU, {SIG_IGN}, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0 +rt_sigaction(SIGTTIN, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, {SIG_IGN}, 8) = 0 +rt_sigaction(SIGTTIN, {SIG_IGN}, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0 +rt_sigaction(SIGWINCH, {0x80ca5cd, [], SA_RESTORER|SA_RESTART, 0x6ff7a4f8}, {0x807dc33, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0 +write(2, "sh-3.00# ", 9) = 9 + + +getpid() = 19755 +rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 +rt_sigaction(SIGTSTP, {SIG_DFL}, {SIG_IGN}, 8) = 0 +rt_sigaction(SIGTTIN, {SIG_DFL}, {SIG_IGN}, 8) = 0 +rt_sigaction(SIGTTOU, {SIG_DFL}, {SIG_IGN}, 8) = 0 +setpgid(19755, 19755) = 0 +rt_sigprocmask(SIG_BLOCK, [CHLD TSTP TTIN TTOU], [], 8) = 0 +ioctl(255, TIOCSPGRP, [19755]) = 0 +rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 +close(4) = 0 +dup2(5, 1) = 1 +close(5) = 0 +rt_sigaction(SIGINT, {SIG_DFL}, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0 +rt_sigaction(SIGQUIT, {SIG_DFL}, {SIG_IGN}, 8) = 0 +rt_sigaction(SIGTERM, {SIG_DFL}, {SIG_IGN}, 8) = 0 +rt_sigaction(SIGCHLD, {SIG_DFL}, {0x807c922, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0 +execve("/bin/sleep", ["sleep", "1"], [/* 34 vars */]) = 0 +... +_exit(0) = ? + + +getpid() = 19756 +rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 +rt_sigaction(SIGTSTP, {SIG_DFL}, {SIG_IGN}, 8) = 0 +rt_sigaction(SIGTTIN, {SIG_DFL}, {SIG_IGN}, 8) = 0 +rt_sigaction(SIGTTOU, {SIG_DFL}, {SIG_IGN}, 8) = 0 +setpgid(19756, 19755) = 0 +rt_sigprocmask(SIG_BLOCK, [CHLD TSTP TTIN TTOU], [], 8) = 0 +ioctl(255, TIOCSPGRP, [19755]) = 0 +rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 +dup2(4, 0) = 0 +close(4) = 0 +rt_sigaction(SIGINT, {SIG_DFL}, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0 +rt_sigaction(SIGQUIT, {SIG_DFL}, {SIG_IGN}, 8) = 0 +rt_sigaction(SIGTERM, {SIG_DFL}, {SIG_IGN}, 8) = 0 +rt_sigaction(SIGCHLD, {SIG_DFL}, {0x807c922, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0 +execve("/bin/sleep", ["sleep", "2"], [/* 34 vars */]) = 0 +... +_exit(0) = ? |