1 | strace of "sleep 1 | sleep 2" being run from interactive bash 3.0
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2 |
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3 |
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4 | Synopsis:
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5 | open /dev/tty [, if fails, open ttyname(0)]; close /* helps re-establish ctty */
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6 | get current signal mask
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7 | TCGETS on fd# 0
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8 | TCGETS on fd# 2 /* NB: if returns ENOTTY (2>/dev/null), sh seems to disable job control,
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9 | does not show prompt, but still executes cmds from fd# 0 */
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10 | install default handlers for CHLD QUIT TERM
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11 | install common handler for HUP INT ILL TRAP ABRT FPE BUS SEGV SYS PIPE ALRM TERM XCPU XFSZ VTALRM USR1 USR2
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12 | ignore QUIT
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13 | install handler for INT
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14 | ignore TERM
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15 | install handler for INT
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16 | ignore TSTP TTOU TTIN
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17 | install handler for WINCH
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18 | get pid, ppid
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19 | block all signals
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20 | unblock all signals
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21 | get our pprocess group
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22 | minidoc:
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23 | Each process group is a member of a session and each process is a member
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24 | of the session of which its process group is a member.
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25 | Process groups are used for distribution of signals, and by terminals
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26 | to arbitrate requests for their input: processes that have the same
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27 | process group as the terminal are foreground and may read, while others
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28 | will block with a signal if they attempt to read. These calls are thus used
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29 | by programs (shells) to create process groups in implementing job control.
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30 | The TIOCGPGRP and TIOCSPGRP calls described in termios(3) are used to get/set
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31 | the process group of the control terminal.
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32 | If a session has a controlling terminal, CLOCAL is not set and a hangup occurs,
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33 | then the session leader is sent a SIGHUP. If the session leader exits,
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34 | the SIGHUP signal will be sent to each process in the foreground process
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35 | group of the controlling terminal.
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36 | If the exit of the process causes a process group to become orphaned,
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37 | and if any member of the newly-orphaned process group is stopped, then a SIGHUP
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38 | signal followed by a SIGCONT signal will be sent to each process
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39 | in the newly-orphaned process group.
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40 | ...
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41 | dup stderr to fd# 255
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42 | move ourself to our own process group
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43 | block CHLD TSTP TTIN TTOU
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44 | set tty's (255, stderr's) foreground process group to our group
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45 | allow all signals
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46 | mark 255 CLOEXEC
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47 | set CHLD handler
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48 | get signal mask
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49 | get fd#0 flags
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50 | get signal mask
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51 | set INT handler
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52 | block CHLD TSTP TTIN TTOU
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53 | set fd #255 foreground process group to our group
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54 | allow all signals
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55 | set INT handler
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56 | block all signals
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57 | allow all signals
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58 | block INT
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59 | allow all signals
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60 | lotsa sigactions: set INT,ALRM,WINCH handlers, ignore TERM,QUIT,TSTP,TTOU,TTIN
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61 | block all signals
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62 | allow all signals
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63 | block all signals
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64 | allow all signals
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65 | block all signals
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66 | allow all signals
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67 | read "sleep 1 | sleep 2\n"
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68 | block INT
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69 | TCSETSW on fd# 0
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70 | allow all signals
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71 | lotsa sigactions: set INT,ALRM,WINCH handlers, ignore TERM,QUIT,TSTP,TTOU,TTIN
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72 | block CHLD
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73 | pipe([4, 5]) /* oops seems I lost another pipe() in editing... */
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74 | fork child #1
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75 | put child in it's own process group
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76 | block only CHLD
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77 | close(5)
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78 | block only INT CHLD
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79 | fork child #2
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80 | put child in the same process group as first one
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81 | block only CHLD
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82 | close(4)
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83 | block only CHLD
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84 | block only CHLD TSTP TTIN TTOU
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85 | set fd# 255 foreground process group to first child's one
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86 | block only CHLD
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87 | block only CHLD
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88 | block only CHLD
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89 | /* note: because shell is not in foreground now, e.g. Ctrl-C will send INT to children only! */
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90 | wait4 for children to die or stop - first child exits
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91 | wait4 for children to die or stop - second child exits
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92 | block CHLD TSTP TTIN TTOU
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93 | set fd# 255 foreground process group to our own one
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94 | block only CHLD
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95 | block only CHLD
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96 | block nothing
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97 | --- SIGCHLD (Child exited) @ 0 (0) ---
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98 | wait for it - no child (already waited for)
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99 | sigreturn()
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100 | read signal mask
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101 | lotsa sigactions...
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102 | read next command
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103 |
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104 |
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105 | execve("/bin/sh", ["sh"], [/* 34 vars */]) = 0
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106 | rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0
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107 | ioctl(0, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
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108 | ioctl(2, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
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109 | rt_sigaction(SIGCHLD, {SIG_DFL}, {SIG_DFL}, 8) = 0
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110 | rt_sigaction(SIGQUIT, {SIG_DFL}, {SIG_DFL}, 8) = 0
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111 | rt_sigaction(SIGTERM, {SIG_DFL}, {SIG_DFL}, 8) = 0
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112 | 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
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113 | 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
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114 | 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
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115 | 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
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116 | 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
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117 | 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
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118 | 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
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119 | 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
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120 | 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
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121 | 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
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122 | 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
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123 | 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
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124 | 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
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125 | 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
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126 | 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
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127 | 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
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128 | 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
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129 | rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0
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130 | rt_sigaction(SIGQUIT, {SIG_IGN}, {SIG_DFL}, 8) = 0
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131 | 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
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132 | 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
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133 | rt_sigaction(SIGINT, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0
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134 | rt_sigaction(SIGTSTP, {SIG_IGN}, {SIG_DFL}, 8) = 0
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135 | rt_sigaction(SIGTTOU, {SIG_IGN}, {SIG_DFL}, 8) = 0
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136 | rt_sigaction(SIGTTIN, {SIG_IGN}, {SIG_DFL}, 8) = 0
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137 | rt_sigaction(SIGWINCH, {0x807dc33, [], SA_RESTORER, 0x6ff7a4f8}, {SIG_DFL}, 8) = 0
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138 | getpid() = 19473
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139 | getppid() = 19472
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140 | rt_sigprocmask(SIG_BLOCK, ~[], [], 8) = 0
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141 | rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
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142 | getpgrp() = 1865
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143 | dup(2) = 4
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144 | fcntl64(255, F_GETFD) = -1 EBADF (Bad file descriptor)
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145 | dup2(4, 255) = 255
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146 | close(4) = 0
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147 | ioctl(255, TIOCGPGRP, [1865]) = 0
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148 | getpid() = 19473
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149 | setpgid(0, 19473) = 0
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150 | rt_sigprocmask(SIG_BLOCK, [CHLD TSTP TTIN TTOU], [], 8) = 0
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151 | ioctl(255, TIOCSPGRP, [19473]) = 0
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152 | rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
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153 | fcntl64(255, F_SETFD, FD_CLOEXEC) = 0
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154 | rt_sigaction(SIGCHLD, {0x807c922, [], SA_RESTORER, 0x6ff7a4f8}, {SIG_DFL}, 8) = 0
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155 | rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0
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156 | fcntl64(0, F_GETFL) = 0x2 (flags O_RDWR)
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157 | ...
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158 | rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0
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159 | rt_sigaction(SIGINT, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0
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160 | rt_sigprocmask(SIG_BLOCK, [CHLD TSTP TTIN TTOU], [], 8) = 0
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161 | ioctl(255, TIOCSPGRP, [19473]) = 0
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162 | rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
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163 | rt_sigaction(SIGINT, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0
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164 | rt_sigprocmask(SIG_BLOCK, ~[], [], 8) = 0
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165 | rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
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166 | rt_sigprocmask(SIG_BLOCK, [INT], [], 8) = 0
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167 | rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
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168 | rt_sigaction(SIGINT, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0
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169 | rt_sigaction(SIGTERM, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, {SIG_IGN}, 8) = 0
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170 | rt_sigaction(SIGTERM, {SIG_IGN}, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0
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171 | rt_sigaction(SIGQUIT, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, {SIG_IGN}, 8) = 0
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172 | rt_sigaction(SIGQUIT, {SIG_IGN}, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0
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173 | 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
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174 | rt_sigaction(SIGTSTP, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, {SIG_IGN}, 8) = 0
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175 | rt_sigaction(SIGTSTP, {SIG_IGN}, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0
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176 | rt_sigaction(SIGTTOU, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, {SIG_IGN}, 8) = 0
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177 | rt_sigaction(SIGTTOU, {SIG_IGN}, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0
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178 | rt_sigaction(SIGTTIN, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, {SIG_IGN}, 8) = 0
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179 | rt_sigaction(SIGTTIN, {SIG_IGN}, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0
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180 | rt_sigaction(SIGWINCH, {0x80ca5cd, [], SA_RESTORER|SA_RESTART, 0x6ff7a4f8}, {0x807dc33, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0
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181 | rt_sigprocmask(SIG_BLOCK, ~[], [], 8) = 0
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182 | rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
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183 | rt_sigprocmask(SIG_BLOCK, ~[], [], 8) = 0
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184 | rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
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185 | rt_sigprocmask(SIG_BLOCK, ~[], [], 8) = 0
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186 | rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
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187 | write(2, "sh-3.00# ", 9) = 9
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188 | rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0
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189 | read(0, "s", 1) = 1
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190 | write(2, "s", 1) = 1
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191 | rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0
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192 | read(0, "l", 1) = 1
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193 | write(2, "l", 1) = 1
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194 | rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0
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195 | ... rest of "sleep 1 | sleep 2" entered...
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196 | rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0
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197 | read(0, "2", 1) = 1
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198 | write(2, "2", 1) = 1
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199 | rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0
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200 | read(0, "\r", 1) = 1
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201 | write(2, "\n", 1) = 1
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202 | rt_sigprocmask(SIG_BLOCK, [INT], [], 8) = 0
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203 | ioctl(0, SNDCTL_TMR_STOP or TCSETSW, {B38400 opost isig icanon echo ...}) = 0
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204 | rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
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205 | rt_sigaction(SIGINT, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0
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206 | rt_sigaction(SIGTERM, {SIG_IGN}, {SIG_IGN}, 8) = 0
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207 | rt_sigaction(SIGQUIT, {SIG_IGN}, {SIG_IGN}, 8) = 0
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208 | 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
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209 | rt_sigaction(SIGTSTP, {SIG_IGN}, {SIG_IGN}, 8) = 0
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210 | rt_sigaction(SIGTTOU, {SIG_IGN}, {SIG_IGN}, 8) = 0
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211 | rt_sigaction(SIGTTIN, {SIG_IGN}, {SIG_IGN}, 8) = 0
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212 | rt_sigaction(SIGWINCH, {0x807dc33, [], SA_RESTORER, 0x6ff7a4f8}, {0x80ca5cd, [], SA_RESTORER|SA_RESTART, 0x6ff7a4f8}, 8) = 0
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213 | rt_sigaction(SIGINT, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0
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214 | rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
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215 | pipe([4, 5]) = 0
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216 | rt_sigprocmask(SIG_BLOCK, [INT CHLD], [CHLD], 8) = 0
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217 | fork() = 19755
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218 | setpgid(19755, 19755) = 0
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219 | rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0
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220 | close(5) = 0
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221 | rt_sigprocmask(SIG_BLOCK, [INT CHLD], [CHLD], 8) = 0
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222 | fork() = 19756
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223 | setpgid(19756, 19755) = 0
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224 | rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0
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225 | close(4) = 0
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226 | rt_sigprocmask(SIG_BLOCK, [CHLD], [CHLD], 8) = 0
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227 | rt_sigprocmask(SIG_BLOCK, [CHLD TSTP TTIN TTOU], [CHLD], 8) = 0
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228 | ioctl(255, TIOCSPGRP, [19755]) = 0
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229 | rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0
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230 | rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0
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231 | rt_sigprocmask(SIG_BLOCK, [CHLD], [CHLD], 8) = 0
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232 | wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], WUNTRACED, NULL) = 19755
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233 | wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], WUNTRACED, NULL) = 19756
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234 | rt_sigprocmask(SIG_BLOCK, [CHLD TSTP TTIN TTOU], [CHLD], 8) = 0
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235 | ioctl(255, TIOCSPGRP, [19473]) = 0
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236 | rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0
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237 | rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0
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238 | rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
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239 | --- SIGCHLD (Child exited) @ 0 (0) ---
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240 | wait4(-1, 0x77fc9c54, WNOHANG|WUNTRACED, NULL) = -1 ECHILD (No child processes)
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241 | sigreturn() = ? (mask now [])
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242 | rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0
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243 | rt_sigaction(SIGINT, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0
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244 | rt_sigprocmask(SIG_BLOCK, [CHLD TSTP TTIN TTOU], [], 8) = 0
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245 | ioctl(255, TIOCSPGRP, [19473]) = 0
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246 | rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
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247 | rt_sigaction(SIGINT, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0
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248 | rt_sigprocmask(SIG_BLOCK, [INT], [], 8) = 0
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249 | rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
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250 | rt_sigaction(SIGINT, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0
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251 | rt_sigaction(SIGTERM, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, {SIG_IGN}, 8) = 0
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252 | rt_sigaction(SIGTERM, {SIG_IGN}, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0
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253 | rt_sigaction(SIGQUIT, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, {SIG_IGN}, 8) = 0
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254 | rt_sigaction(SIGQUIT, {SIG_IGN}, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0
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255 | 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
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256 | rt_sigaction(SIGTSTP, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, {SIG_IGN}, 8) = 0
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257 | rt_sigaction(SIGTSTP, {SIG_IGN}, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0
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258 | rt_sigaction(SIGTTOU, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, {SIG_IGN}, 8) = 0
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259 | rt_sigaction(SIGTTOU, {SIG_IGN}, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0
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260 | rt_sigaction(SIGTTIN, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, {SIG_IGN}, 8) = 0
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261 | rt_sigaction(SIGTTIN, {SIG_IGN}, {0x80ca530, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0
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262 | rt_sigaction(SIGWINCH, {0x80ca5cd, [], SA_RESTORER|SA_RESTART, 0x6ff7a4f8}, {0x807dc33, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0
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263 | write(2, "sh-3.00# ", 9) = 9
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264 |
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265 |
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266 | getpid() = 19755
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267 | rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
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268 | rt_sigaction(SIGTSTP, {SIG_DFL}, {SIG_IGN}, 8) = 0
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269 | rt_sigaction(SIGTTIN, {SIG_DFL}, {SIG_IGN}, 8) = 0
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270 | rt_sigaction(SIGTTOU, {SIG_DFL}, {SIG_IGN}, 8) = 0
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271 | setpgid(19755, 19755) = 0
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272 | rt_sigprocmask(SIG_BLOCK, [CHLD TSTP TTIN TTOU], [], 8) = 0
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273 | ioctl(255, TIOCSPGRP, [19755]) = 0
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274 | rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
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275 | close(4) = 0
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276 | dup2(5, 1) = 1
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277 | close(5) = 0
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278 | rt_sigaction(SIGINT, {SIG_DFL}, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0
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279 | rt_sigaction(SIGQUIT, {SIG_DFL}, {SIG_IGN}, 8) = 0
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280 | rt_sigaction(SIGTERM, {SIG_DFL}, {SIG_IGN}, 8) = 0
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281 | rt_sigaction(SIGCHLD, {SIG_DFL}, {0x807c922, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0
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282 | execve("/bin/sleep", ["sleep", "1"], [/* 34 vars */]) = 0
|
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283 | ...
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284 | _exit(0) = ?
|
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285 |
|
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286 |
|
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287 | getpid() = 19756
|
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288 | rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
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289 | rt_sigaction(SIGTSTP, {SIG_DFL}, {SIG_IGN}, 8) = 0
|
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290 | rt_sigaction(SIGTTIN, {SIG_DFL}, {SIG_IGN}, 8) = 0
|
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291 | rt_sigaction(SIGTTOU, {SIG_DFL}, {SIG_IGN}, 8) = 0
|
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292 | setpgid(19756, 19755) = 0
|
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293 | rt_sigprocmask(SIG_BLOCK, [CHLD TSTP TTIN TTOU], [], 8) = 0
|
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294 | ioctl(255, TIOCSPGRP, [19755]) = 0
|
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295 | rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
|
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296 | dup2(4, 0) = 0
|
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297 | close(4) = 0
|
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298 | rt_sigaction(SIGINT, {SIG_DFL}, {0x808f7d7, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0
|
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299 | rt_sigaction(SIGQUIT, {SIG_DFL}, {SIG_IGN}, 8) = 0
|
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300 | rt_sigaction(SIGTERM, {SIG_DFL}, {SIG_IGN}, 8) = 0
|
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301 | rt_sigaction(SIGCHLD, {SIG_DFL}, {0x807c922, [], SA_RESTORER, 0x6ff7a4f8}, 8) = 0
|
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302 | execve("/bin/sleep", ["sleep", "2"], [/* 34 vars */]) = 0
|
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303 | ...
|
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304 | _exit(0) = ?
|
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