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drwxr-xr-x
asm9_unix1_amd64.s
1.02
KB
-rw-r--r--
asm9_unix2_amd64.s
1.2
KB
-rw-r--r--
asm_aix_ppc64.s
540
B
-rw-r--r--
asm_darwin_386.s
2.5
KB
-rw-r--r--
asm_darwin_amd64.s
2.82
KB
-rw-r--r--
asm_darwin_arm.s
2.81
KB
-rw-r--r--
asm_darwin_arm64.s
2.71
KB
-rw-r--r--
asm_freebsd_arm.s
2.96
KB
-rw-r--r--
asm_freebsd_arm64.s
2.68
KB
-rw-r--r--
asm_linux_386.s
4.67
KB
-rw-r--r--
asm_linux_amd64.s
3.21
KB
-rw-r--r--
asm_linux_arm.s
3.63
KB
-rw-r--r--
asm_linux_arm64.s
2.73
KB
-rw-r--r--
asm_linux_mips64x.s
2.28
KB
-rw-r--r--
asm_linux_mipsx.s
3.28
KB
-rw-r--r--
asm_linux_ppc64x.s
2.66
KB
-rw-r--r--
asm_linux_riscv64.s
2.46
KB
-rw-r--r--
asm_linux_s390x.s
4.19
KB
-rw-r--r--
asm_netbsd_arm.s
2.85
KB
-rw-r--r--
asm_netbsd_arm64.s
2.77
KB
-rw-r--r--
asm_openbsd_arm.s
3.22
KB
-rw-r--r--
asm_openbsd_arm64.s
2.49
KB
-rw-r--r--
asm_plan9_386.s
3.14
KB
-rw-r--r--
asm_plan9_amd64.s
3.06
KB
-rw-r--r--
asm_plan9_arm.s
3.25
KB
-rw-r--r--
asm_solaris_amd64.s
1.79
KB
-rw-r--r--
asm_unix_386.s
2.74
KB
-rw-r--r--
asm_unix_amd64.s
2.08
KB
-rw-r--r--
asm_windows.s
384
B
-rw-r--r--
bpf_bsd.go
4.61
KB
-rw-r--r--
bpf_darwin.go
3.97
KB
-rw-r--r--
const_plan9.go
1.2
KB
-rw-r--r--
creds_test.go
3.26
KB
-rw-r--r--
dir_plan9.go
5.62
KB
-rw-r--r--
dirent.go
3
KB
-rw-r--r--
dirent_test.go
3.28
KB
-rw-r--r--
dll_windows.go
9.72
KB
-rw-r--r--
endian_big.go
239
B
-rw-r--r--
endian_little.go
273
B
-rw-r--r--
env_plan9.go
2.15
KB
-rw-r--r--
env_unix.go
2.77
KB
-rw-r--r--
env_windows.go
1.75
KB
-rw-r--r--
errors_plan9.go
1.61
KB
-rw-r--r--
exec_aix_test.go
816
B
-rw-r--r--
exec_bsd.go
6.36
KB
-rw-r--r--
exec_darwin.go
6.76
KB
-rw-r--r--
exec_libc.go
6.96
KB
-rw-r--r--
exec_linux.go
18.34
KB
-rw-r--r--
exec_linux_test.go
18.81
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-rw-r--r--
exec_plan9.go
13.19
KB
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exec_solaris_test.go
808
B
-rw-r--r--
exec_unix.go
8.13
KB
-rw-r--r--
exec_unix_test.go
3.89
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-rw-r--r--
exec_windows.go
7.64
KB
-rw-r--r--
export_freebsd_test.go
304
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-rw-r--r--
export_linux_test.go
252
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-rw-r--r--
export_test.go
193
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-rw-r--r--
export_unix_test.go
341
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-rw-r--r--
flock.go
691
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-rw-r--r--
flock_aix.go
564
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-rw-r--r--
flock_darwin.go
405
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-rw-r--r--
flock_linux_32bit.go
481
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-rw-r--r--
forkpipe.go
501
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-rw-r--r--
forkpipe2.go
276
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-rw-r--r--
fs_js.go
10.46
KB
-rw-r--r--
getdirentries_test.go
2.18
KB
-rw-r--r--
lsf_linux.go
2.12
KB
-rw-r--r--
mkall.sh
12.49
KB
-rwxr-xr-x
mkasm_darwin.go
1.66
KB
-rw-r--r--
mkerrors.sh
10.65
KB
-rwxr-xr-x
mkpost.go
1.99
KB
-rw-r--r--
mksyscall.pl
9.52
KB
-rwxr-xr-x
mksyscall_libc.pl
7.8
KB
-rwxr-xr-x
mksyscall_windows.go
707
B
-rw-r--r--
mksysctl_openbsd.pl
5.04
KB
-rwxr-xr-x
mksysnum_darwin.pl
578
B
-rwxr-xr-x
mksysnum_dragonfly.pl
866
B
-rwxr-xr-x
mksysnum_freebsd.pl
1.35
KB
-rwxr-xr-x
mksysnum_linux.pl
1.26
KB
-rwxr-xr-x
mksysnum_netbsd.pl
1.01
KB
-rwxr-xr-x
mksysnum_openbsd.pl
871
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-rwxr-xr-x
mksysnum_plan9.sh
459
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-rwxr-xr-x
mmap_unix_test.go
544
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-rw-r--r--
msan.go
409
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-rw-r--r--
msan0.go
341
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-rw-r--r--
net.go
1.19
KB
-rw-r--r--
net_js.go
2.11
KB
-rw-r--r--
netlink_linux.go
4.67
KB
-rw-r--r--
pwd_plan9.go
1.55
KB
-rw-r--r--
route_bsd.go
9.09
KB
-rw-r--r--
route_darwin.go
2.01
KB
-rw-r--r--
route_dragonfly.go
2.61
KB
-rw-r--r--
route_freebsd.go
2.67
KB
-rw-r--r--
route_freebsd_32bit.go
1.29
KB
-rw-r--r--
route_freebsd_64bit.go
724
B
-rw-r--r--
route_netbsd.go
1.43
KB
-rw-r--r--
route_openbsd.go
1.46
KB
-rw-r--r--
security_windows.go
10.12
KB
-rw-r--r--
setuidgid_32_linux.go
306
B
-rw-r--r--
setuidgid_linux.go
302
B
-rw-r--r--
sock_cloexec_linux.go
632
B
-rw-r--r--
sockcmsg_dragonfly.go
547
B
-rw-r--r--
sockcmsg_linux.go
1.12
KB
-rw-r--r--
sockcmsg_unix.go
2.56
KB
-rw-r--r--
sockcmsg_unix_other.go
957
B
-rw-r--r--
str.go
549
B
-rw-r--r--
syscall.go
3.72
KB
-rw-r--r--
syscall_aix.go
17.83
KB
-rw-r--r--
syscall_aix_ppc64.go
405
B
-rw-r--r--
syscall_bsd.go
14.07
KB
-rw-r--r--
syscall_bsd_test.go
1.16
KB
-rw-r--r--
syscall_darwin.go
14.26
KB
-rw-r--r--
syscall_darwin_386.go
2
KB
-rw-r--r--
syscall_darwin_amd64.go
1.92
KB
-rw-r--r--
syscall_darwin_arm.go
2.03
KB
-rw-r--r--
syscall_darwin_arm64.go
1.98
KB
-rw-r--r--
syscall_dragonfly.go
7.98
KB
-rw-r--r--
syscall_dragonfly_amd64.go
1.12
KB
-rw-r--r--
syscall_freebsd.go
15.82
KB
-rw-r--r--
syscall_freebsd_386.go
1.17
KB
-rw-r--r--
syscall_freebsd_amd64.go
1.12
KB
-rw-r--r--
syscall_freebsd_arm.go
1.16
KB
-rw-r--r--
syscall_freebsd_arm64.go
1.12
KB
-rw-r--r--
syscall_freebsd_test.go
1.35
KB
-rw-r--r--
syscall_getwd_bsd.go
453
B
-rw-r--r--
syscall_js.go
6.59
KB
-rw-r--r--
syscall_linux.go
26.05
KB
-rw-r--r--
syscall_linux_386.go
10.91
KB
-rw-r--r--
syscall_linux_amd64.go
5.39
KB
-rw-r--r--
syscall_linux_arm.go
7.47
KB
-rw-r--r--
syscall_linux_arm64.go
6.24
KB
-rw-r--r--
syscall_linux_mips64x.go
6.58
KB
-rw-r--r--
syscall_linux_mipsx.go
7.03
KB
-rw-r--r--
syscall_linux_ppc64x.go
5.21
KB
-rw-r--r--
syscall_linux_riscv64.go
6.4
KB
-rw-r--r--
syscall_linux_s390x.go
8.64
KB
-rw-r--r--
syscall_linux_test.go
10.61
KB
-rw-r--r--
syscall_netbsd.go
7.59
KB
-rw-r--r--
syscall_netbsd_386.go
716
B
-rw-r--r--
syscall_netbsd_amd64.go
709
B
-rw-r--r--
syscall_netbsd_arm.go
716
B
-rw-r--r--
syscall_netbsd_arm64.go
709
B
-rw-r--r--
syscall_openbsd.go
7.06
KB
-rw-r--r--
syscall_openbsd_386.go
715
B
-rw-r--r--
syscall_openbsd_amd64.go
701
B
-rw-r--r--
syscall_openbsd_arm.go
715
B
-rw-r--r--
syscall_openbsd_arm64.go
906
B
-rw-r--r--
syscall_plan9.go
8.94
KB
-rw-r--r--
syscall_plan9_test.go
1.15
KB
-rw-r--r--
syscall_ptrace_test.go
752
B
-rw-r--r--
syscall_solaris.go
15.07
KB
-rw-r--r--
syscall_solaris_amd64.go
487
B
-rw-r--r--
syscall_test.go
1.7
KB
-rw-r--r--
syscall_unix.go
8.3
KB
-rw-r--r--
syscall_unix_test.go
10.61
KB
-rw-r--r--
syscall_windows.go
42.54
KB
-rw-r--r--
syscall_windows_386.go
176
B
-rw-r--r--
syscall_windows_amd64.go
176
B
-rw-r--r--
syscall_windows_test.go
1.8
KB
-rw-r--r--
tables_js.go
19.17
KB
-rw-r--r--
time_fake.go
676
B
-rw-r--r--
time_nofake.go
350
B
-rw-r--r--
timestruct.go
1.13
KB
-rw-r--r--
types_aix.go
3.35
KB
-rw-r--r--
types_darwin.go
4.98
KB
-rw-r--r--
types_dragonfly.go
5.04
KB
-rw-r--r--
types_freebsd.go
6.96
KB
-rw-r--r--
types_linux.go
10.68
KB
-rw-r--r--
types_netbsd.go
4.77
KB
-rw-r--r--
types_openbsd.go
5.04
KB
-rw-r--r--
types_solaris.go
4.88
KB
-rw-r--r--
types_windows.go
26.96
KB
-rw-r--r--
types_windows_386.go
477
B
-rw-r--r--
types_windows_amd64.go
477
B
-rw-r--r--
types_windows_arm.go
477
B
-rw-r--r--
zerrors_aix_ppc64.go
47.16
KB
-rw-r--r--
zerrors_darwin_386.go
55.27
KB
-rw-r--r--
zerrors_darwin_amd64.go
55.27
KB
-rw-r--r--
zerrors_darwin_arm.go
46.08
KB
-rw-r--r--
zerrors_darwin_arm64.go
55.78
KB
-rw-r--r--
zerrors_dragonfly_amd64.go
59.49
KB
-rw-r--r--
zerrors_freebsd_386.go
67.35
KB
-rw-r--r--
zerrors_freebsd_amd64.go
67.4
KB
-rw-r--r--
zerrors_freebsd_arm.go
67.34
KB
-rw-r--r--
zerrors_freebsd_arm64.go
67.41
KB
-rw-r--r--
zerrors_linux_386.go
58.31
KB
-rw-r--r--
zerrors_linux_amd64.go
58.35
KB
-rw-r--r--
zerrors_linux_arm.go
58.83
KB
-rw-r--r--
zerrors_linux_arm64.go
69.52
KB
-rw-r--r--
zerrors_linux_mips.go
70.14
KB
-rw-r--r--
zerrors_linux_mips64.go
69.46
KB
-rw-r--r--
zerrors_linux_mips64le.go
69.46
KB
-rw-r--r--
zerrors_linux_mipsle.go
70.14
KB
-rw-r--r--
zerrors_linux_ppc64.go
71.84
KB
-rw-r--r--
zerrors_linux_ppc64le.go
72.8
KB
-rw-r--r--
zerrors_linux_riscv64.go
71.76
KB
-rw-r--r--
zerrors_linux_s390x.go
74.28
KB
-rw-r--r--
zerrors_netbsd_386.go
67.43
KB
-rw-r--r--
zerrors_netbsd_amd64.go
67.02
KB
-rw-r--r--
zerrors_netbsd_arm.go
66.45
KB
-rw-r--r--
zerrors_netbsd_arm64.go
67.02
KB
-rw-r--r--
zerrors_openbsd_386.go
62.47
KB
-rw-r--r--
zerrors_openbsd_amd64.go
62.43
KB
-rw-r--r--
zerrors_openbsd_arm.go
62.46
KB
-rw-r--r--
zerrors_openbsd_arm64.go
66.36
KB
-rw-r--r--
zerrors_solaris_amd64.go
50.71
KB
-rw-r--r--
zerrors_windows.go
9.97
KB
-rw-r--r--
zerrors_windows_386.go
176
B
-rw-r--r--
zerrors_windows_amd64.go
176
B
-rw-r--r--
zsyscall_aix_ppc64.go
40.02
KB
-rw-r--r--
zsyscall_darwin_386.go
53.97
KB
-rw-r--r--
zsyscall_darwin_386.s
8.65
KB
-rw-r--r--
zsyscall_darwin_amd64.go
53.83
KB
-rw-r--r--
zsyscall_darwin_amd64.s
8.65
KB
-rw-r--r--
zsyscall_darwin_arm.go
53.44
KB
-rw-r--r--
zsyscall_darwin_arm.s
8.56
KB
-rw-r--r--
zsyscall_darwin_arm64.go
53.3
KB
-rw-r--r--
zsyscall_darwin_arm64.s
8.56
KB
-rw-r--r--
zsyscall_dragonfly_amd64.go
30.9
KB
-rw-r--r--
zsyscall_freebsd_386.go
33.55
KB
-rw-r--r--
zsyscall_freebsd_amd64.go
33.41
KB
-rw-r--r--
zsyscall_freebsd_arm.go
33.58
KB
-rw-r--r--
zsyscall_freebsd_arm64.go
33.41
KB
-rw-r--r--
zsyscall_linux_386.go
35.54
KB
-rw-r--r--
zsyscall_linux_amd64.go
40.66
KB
-rw-r--r--
zsyscall_linux_arm.go
39.77
KB
-rw-r--r--
zsyscall_linux_arm64.go
38.92
KB
-rw-r--r--
zsyscall_linux_mips.go
41.52
KB
-rw-r--r--
zsyscall_linux_mips64.go
41.3
KB
-rw-r--r--
zsyscall_linux_mips64le.go
41.3
KB
-rw-r--r--
zsyscall_linux_mipsle.go
41.52
KB
-rw-r--r--
zsyscall_linux_ppc64.go
41.94
KB
-rw-r--r--
zsyscall_linux_ppc64le.go
41.94
KB
-rw-r--r--
zsyscall_linux_riscv64.go
38.95
KB
-rw-r--r--
zsyscall_linux_s390x.go
35.94
KB
-rw-r--r--
zsyscall_netbsd_386.go
29.62
KB
-rw-r--r--
zsyscall_netbsd_amd64.go
29.48
KB
-rw-r--r--
zsyscall_netbsd_arm.go
29.63
KB
-rw-r--r--
zsyscall_netbsd_arm64.go
29.48
KB
-rw-r--r--
zsyscall_openbsd_386.go
30.46
KB
-rw-r--r--
zsyscall_openbsd_amd64.go
30.32
KB
-rw-r--r--
zsyscall_openbsd_arm.go
30.47
KB
-rw-r--r--
zsyscall_openbsd_arm64.go
30.32
KB
-rw-r--r--
zsyscall_plan9_386.go
6.17
KB
-rw-r--r--
zsyscall_plan9_amd64.go
6.17
KB
-rw-r--r--
zsyscall_plan9_arm.go
6.17
KB
-rw-r--r--
zsyscall_solaris_amd64.go
35.79
KB
-rw-r--r--
zsyscall_windows.go
60.53
KB
-rw-r--r--
zsysctl_openbsd.go
11.71
KB
-rw-r--r--
zsysnum_darwin_386.go
14.55
KB
-rw-r--r--
zsysnum_darwin_amd64.go
14.55
KB
-rw-r--r--
zsysnum_darwin_arm.go
12.28
KB
-rw-r--r--
zsysnum_darwin_arm64.go
14.38
KB
-rw-r--r--
zsysnum_dragonfly_amd64.go
22.72
KB
-rw-r--r--
zsysnum_freebsd_386.go
25.65
KB
-rw-r--r--
zsysnum_freebsd_amd64.go
25.65
KB
-rw-r--r--
zsysnum_freebsd_arm.go
25.65
KB
-rw-r--r--
zsysnum_freebsd_arm64.go
36.09
KB
-rw-r--r--
zsysnum_linux_386.go
11.26
KB
-rw-r--r--
zsysnum_linux_amd64.go
10.1
KB
-rw-r--r--
zsysnum_linux_arm.go
11.55
KB
-rw-r--r--
zsysnum_linux_arm64.go
8.95
KB
-rw-r--r--
zsysnum_linux_mips.go
12.1
KB
-rw-r--r--
zsysnum_linux_mips64.go
10.93
KB
-rw-r--r--
zsysnum_linux_mips64le.go
10.93
KB
-rw-r--r--
zsysnum_linux_mipsle.go
12.1
KB
-rw-r--r--
zsysnum_linux_ppc64.go
11.46
KB
-rw-r--r--
zsysnum_linux_ppc64le.go
11.49
KB
-rw-r--r--
zsysnum_linux_riscv64.go
8.88
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-rw-r--r--
zsysnum_linux_s390x.go
10.64
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-rw-r--r--
zsysnum_netbsd_386.go
25.54
KB
-rw-r--r--
zsysnum_netbsd_amd64.go
25.55
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-rw-r--r--
zsysnum_netbsd_arm.go
25.54
KB
-rw-r--r--
zsysnum_netbsd_arm64.go
25.55
KB
-rw-r--r--
zsysnum_openbsd_386.go
14.15
KB
-rw-r--r--
zsysnum_openbsd_amd64.go
14.15
KB
-rw-r--r--
zsysnum_openbsd_arm.go
14.46
KB
-rw-r--r--
zsysnum_openbsd_arm64.go
14.72
KB
-rw-r--r--
zsysnum_plan9.go
1.03
KB
-rw-r--r--
zsysnum_solaris_amd64.go
289
B
-rw-r--r--
zsysnum_windows_386.go
40
B
-rw-r--r--
zsysnum_windows_amd64.go
40
B
-rw-r--r--
ztypes_aix_ppc64.go
4.17
KB
-rw-r--r--
ztypes_darwin_386.go
6.7
KB
-rw-r--r--
ztypes_darwin_amd64.go
6.92
KB
-rw-r--r--
ztypes_darwin_arm.go
6.77
KB
-rw-r--r--
ztypes_darwin_arm64.go
6.92
KB
-rw-r--r--
ztypes_dragonfly_amd64.go
6.7
KB
-rw-r--r--
ztypes_freebsd_386.go
9
KB
-rw-r--r--
ztypes_freebsd_amd64.go
9
KB
-rw-r--r--
ztypes_freebsd_arm.go
9.01
KB
-rw-r--r--
ztypes_freebsd_arm64.go
9
KB
-rw-r--r--
ztypes_linux_386.go
11.55
KB
-rw-r--r--
ztypes_linux_amd64.go
11.92
KB
-rw-r--r--
ztypes_linux_arm.go
11.44
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ztypes_solaris_amd64.go
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Code Editor : exec_plan9.go
// Copyright 2009 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. // Fork, exec, wait, etc. package syscall import ( "runtime" "sync" "unsafe" ) // ForkLock is not used on plan9. var ForkLock sync.RWMutex // gstringb reads a non-empty string from b, prefixed with a 16-bit length in little-endian order. // It returns the string as a byte slice, or nil if b is too short to contain the length or // the full string. //go:nosplit func gstringb(b []byte) []byte { if len(b) < 2 { return nil } n, b := gbit16(b) if int(n) > len(b) { return nil } return b[:n] } // Offset of the name field in a 9P directory entry - see UnmarshalDir() in dir_plan9.go const nameOffset = 39 // gdirname returns the first filename from a buffer of directory entries, // and a slice containing the remaining directory entries. // If the buffer doesn't start with a valid directory entry, the returned name is nil. //go:nosplit func gdirname(buf []byte) (name []byte, rest []byte) { if len(buf) < 2 { return } size, buf := gbit16(buf) if size < STATFIXLEN || int(size) > len(buf) { return } name = gstringb(buf[nameOffset:size]) rest = buf[size:] return } // StringSlicePtr converts a slice of strings to a slice of pointers // to NUL-terminated byte arrays. If any string contains a NUL byte // this function panics instead of returning an error. // // Deprecated: Use SlicePtrFromStrings instead. func StringSlicePtr(ss []string) []*byte { bb := make([]*byte, len(ss)+1) for i := 0; i < len(ss); i++ { bb[i] = StringBytePtr(ss[i]) } bb[len(ss)] = nil return bb } // SlicePtrFromStrings converts a slice of strings to a slice of // pointers to NUL-terminated byte arrays. If any string contains // a NUL byte, it returns (nil, EINVAL). func SlicePtrFromStrings(ss []string) ([]*byte, error) { var err error bb := make([]*byte, len(ss)+1) for i := 0; i < len(ss); i++ { bb[i], err = BytePtrFromString(ss[i]) if err != nil { return nil, err } } bb[len(ss)] = nil return bb, nil } // readdirnames returns the names of files inside the directory represented by dirfd. func readdirnames(dirfd int) (names []string, err error) { names = make([]string, 0, 100) var buf [STATMAX]byte for { n, e := Read(dirfd, buf[:]) if e != nil { return nil, e } if n == 0 { break } for b := buf[:n]; len(b) > 0; { var s []byte s, b = gdirname(b) if s == nil { return nil, ErrBadStat } names = append(names, string(s)) } } return } // name of the directory containing names and control files for all open file descriptors var dupdev, _ = BytePtrFromString("#d") // forkAndExecInChild forks the process, calling dup onto 0..len(fd) // and finally invoking exec(argv0, argvv, envv) in the child. // If a dup or exec fails, it writes the error string to pipe. // (The pipe write end is close-on-exec so if exec succeeds, it will be closed.) // // In the child, this function must not acquire any locks, because // they might have been locked at the time of the fork. This means // no rescheduling, no malloc calls, and no new stack segments. // The calls to RawSyscall are okay because they are assembly // functions that do not grow the stack. //go:norace func forkAndExecInChild(argv0 *byte, argv []*byte, envv []envItem, dir *byte, attr *ProcAttr, pipe int, rflag int) (pid int, err error) { // Declare all variables at top in case any // declarations require heap allocation (e.g., errbuf). var ( r1 uintptr nextfd int i int clearenv int envfd int errbuf [ERRMAX]byte statbuf [STATMAX]byte dupdevfd int ) // Guard against side effects of shuffling fds below. // Make sure that nextfd is beyond any currently open files so // that we can't run the risk of overwriting any of them. fd := make([]int, len(attr.Files)) nextfd = len(attr.Files) for i, ufd := range attr.Files { if nextfd < int(ufd) { nextfd = int(ufd) } fd[i] = int(ufd) } nextfd++ if envv != nil { clearenv = RFCENVG } // About to call fork. // No more allocation or calls of non-assembly functions. r1, _, _ = RawSyscall(SYS_RFORK, uintptr(RFPROC|RFFDG|RFREND|clearenv|rflag), 0, 0) if r1 != 0 { if int32(r1) == -1 { return 0, NewError(errstr()) } // parent; return PID return int(r1), nil } // Fork succeeded, now in child. // Close fds we don't need. r1, _, _ = RawSyscall(SYS_OPEN, uintptr(unsafe.Pointer(dupdev)), uintptr(O_RDONLY), 0) dupdevfd = int(r1) if dupdevfd == -1 { goto childerror } dirloop: for { r1, _, _ = RawSyscall6(SYS_PREAD, uintptr(dupdevfd), uintptr(unsafe.Pointer(&statbuf[0])), uintptr(len(statbuf)), ^uintptr(0), ^uintptr(0), 0) n := int(r1) switch n { case -1: goto childerror case 0: break dirloop } for b := statbuf[:n]; len(b) > 0; { var s []byte s, b = gdirname(b) if s == nil { copy(errbuf[:], ErrBadStat.Error()) goto childerror1 } if s[len(s)-1] == 'l' { // control file for descriptor <N> is named <N>ctl continue } closeFdExcept(int(atoi(s)), pipe, dupdevfd, fd) } } RawSyscall(SYS_CLOSE, uintptr(dupdevfd), 0, 0) // Write new environment variables. if envv != nil { for i = 0; i < len(envv); i++ { r1, _, _ = RawSyscall(SYS_CREATE, uintptr(unsafe.Pointer(envv[i].name)), uintptr(O_WRONLY), uintptr(0666)) if int32(r1) == -1 { goto childerror } envfd = int(r1) r1, _, _ = RawSyscall6(SYS_PWRITE, uintptr(envfd), uintptr(unsafe.Pointer(envv[i].value)), uintptr(envv[i].nvalue), ^uintptr(0), ^uintptr(0), 0) if int32(r1) == -1 || int(r1) != envv[i].nvalue { goto childerror } r1, _, _ = RawSyscall(SYS_CLOSE, uintptr(envfd), 0, 0) if int32(r1) == -1 { goto childerror } } } // Chdir if dir != nil { r1, _, _ = RawSyscall(SYS_CHDIR, uintptr(unsafe.Pointer(dir)), 0, 0) if int32(r1) == -1 { goto childerror } } // Pass 1: look for fd[i] < i and move those up above len(fd) // so that pass 2 won't stomp on an fd it needs later. if pipe < nextfd { r1, _, _ = RawSyscall(SYS_DUP, uintptr(pipe), uintptr(nextfd), 0) if int32(r1) == -1 { goto childerror } pipe = nextfd nextfd++ } for i = 0; i < len(fd); i++ { if fd[i] >= 0 && fd[i] < int(i) { if nextfd == pipe { // don't stomp on pipe nextfd++ } r1, _, _ = RawSyscall(SYS_DUP, uintptr(fd[i]), uintptr(nextfd), 0) if int32(r1) == -1 { goto childerror } fd[i] = nextfd nextfd++ } } // Pass 2: dup fd[i] down onto i. for i = 0; i < len(fd); i++ { if fd[i] == -1 { RawSyscall(SYS_CLOSE, uintptr(i), 0, 0) continue } if fd[i] == int(i) { continue } r1, _, _ = RawSyscall(SYS_DUP, uintptr(fd[i]), uintptr(i), 0) if int32(r1) == -1 { goto childerror } } // Pass 3: close fd[i] if it was moved in the previous pass. for i = 0; i < len(fd); i++ { if fd[i] >= 0 && fd[i] != int(i) { RawSyscall(SYS_CLOSE, uintptr(fd[i]), 0, 0) } } // Time to exec. r1, _, _ = RawSyscall(SYS_EXEC, uintptr(unsafe.Pointer(argv0)), uintptr(unsafe.Pointer(&argv[0])), 0) childerror: // send error string on pipe RawSyscall(SYS_ERRSTR, uintptr(unsafe.Pointer(&errbuf[0])), uintptr(len(errbuf)), 0) childerror1: errbuf[len(errbuf)-1] = 0 i = 0 for i < len(errbuf) && errbuf[i] != 0 { i++ } RawSyscall6(SYS_PWRITE, uintptr(pipe), uintptr(unsafe.Pointer(&errbuf[0])), uintptr(i), ^uintptr(0), ^uintptr(0), 0) for { RawSyscall(SYS_EXITS, 0, 0, 0) } } // close the numbered file descriptor, unless it is fd1, fd2, or a member of fds. //go:nosplit func closeFdExcept(n int, fd1 int, fd2 int, fds []int) { if n == fd1 || n == fd2 { return } for _, fd := range fds { if n == fd { return } } RawSyscall(SYS_CLOSE, uintptr(n), 0, 0) } func cexecPipe(p []int) error { e := Pipe(p) if e != nil { return e } fd, e := Open("#d/"+itoa(p[1]), O_CLOEXEC) if e != nil { Close(p[0]) Close(p[1]) return e } Close(fd) return nil } type envItem struct { name *byte value *byte nvalue int } type ProcAttr struct { Dir string // Current working directory. Env []string // Environment. Files []uintptr // File descriptors. Sys *SysProcAttr } type SysProcAttr struct { Rfork int // additional flags to pass to rfork } var zeroProcAttr ProcAttr var zeroSysProcAttr SysProcAttr func forkExec(argv0 string, argv []string, attr *ProcAttr) (pid int, err error) { var ( p [2]int n int errbuf [ERRMAX]byte wmsg Waitmsg ) if attr == nil { attr = &zeroProcAttr } sys := attr.Sys if sys == nil { sys = &zeroSysProcAttr } p[0] = -1 p[1] = -1 // Convert args to C form. argv0p, err := BytePtrFromString(argv0) if err != nil { return 0, err } argvp, err := SlicePtrFromStrings(argv) if err != nil { return 0, err } destDir := attr.Dir if destDir == "" { wdmu.Lock() destDir = wdStr wdmu.Unlock() } var dir *byte if destDir != "" { dir, err = BytePtrFromString(destDir) if err != nil { return 0, err } } var envvParsed []envItem if attr.Env != nil { envvParsed = make([]envItem, 0, len(attr.Env)) for _, v := range attr.Env { i := 0 for i < len(v) && v[i] != '=' { i++ } envname, err := BytePtrFromString("/env/" + v[:i]) if err != nil { return 0, err } envvalue := make([]byte, len(v)-i) copy(envvalue, v[i+1:]) envvParsed = append(envvParsed, envItem{envname, &envvalue[0], len(v) - i}) } } // Allocate child status pipe close on exec. e := cexecPipe(p[:]) if e != nil { return 0, e } // Kick off child. pid, err = forkAndExecInChild(argv0p, argvp, envvParsed, dir, attr, p[1], sys.Rfork) if err != nil { if p[0] >= 0 { Close(p[0]) Close(p[1]) } return 0, err } // Read child error status from pipe. Close(p[1]) n, err = Read(p[0], errbuf[:]) Close(p[0]) if err != nil || n != 0 { if n > 0 { err = NewError(string(errbuf[:n])) } else if err == nil { err = NewError("failed to read exec status") } // Child failed; wait for it to exit, to make sure // the zombies don't accumulate. for wmsg.Pid != pid { Await(&wmsg) } return 0, err } // Read got EOF, so pipe closed on exec, so exec succeeded. return pid, nil } type waitErr struct { Waitmsg err error } var procs struct { sync.Mutex waits map[int]chan *waitErr } // startProcess starts a new goroutine, tied to the OS // thread, which runs the process and subsequently waits // for it to finish, communicating the process stats back // to any goroutines that may have been waiting on it. // // Such a dedicated goroutine is needed because on // Plan 9, only the parent thread can wait for a child, // whereas goroutines tend to jump OS threads (e.g., // between starting a process and running Wait(), the // goroutine may have been rescheduled). func startProcess(argv0 string, argv []string, attr *ProcAttr) (pid int, err error) { type forkRet struct { pid int err error } forkc := make(chan forkRet, 1) go func() { runtime.LockOSThread() var ret forkRet ret.pid, ret.err = forkExec(argv0, argv, attr) // If fork fails there is nothing to wait for. if ret.err != nil || ret.pid == 0 { forkc <- ret return } waitc := make(chan *waitErr, 1) // Mark that the process is running. procs.Lock() if procs.waits == nil { procs.waits = make(map[int]chan *waitErr) } procs.waits[ret.pid] = waitc procs.Unlock() forkc <- ret var w waitErr for w.err == nil && w.Pid != ret.pid { w.err = Await(&w.Waitmsg) } waitc <- &w close(waitc) }() ret := <-forkc return ret.pid, ret.err } // Combination of fork and exec, careful to be thread safe. func ForkExec(argv0 string, argv []string, attr *ProcAttr) (pid int, err error) { return startProcess(argv0, argv, attr) } // StartProcess wraps ForkExec for package os. func StartProcess(argv0 string, argv []string, attr *ProcAttr) (pid int, handle uintptr, err error) { pid, err = startProcess(argv0, argv, attr) return pid, 0, err } // Ordinary exec. func Exec(argv0 string, argv []string, envv []string) (err error) { if envv != nil { r1, _, _ := RawSyscall(SYS_RFORK, RFCENVG, 0, 0) if int32(r1) == -1 { return NewError(errstr()) } for _, v := range envv { i := 0 for i < len(v) && v[i] != '=' { i++ } fd, e := Create("/env/"+v[:i], O_WRONLY, 0666) if e != nil { return e } _, e = Write(fd, []byte(v[i+1:])) if e != nil { Close(fd) return e } Close(fd) } } argv0p, err := BytePtrFromString(argv0) if err != nil { return err } argvp, err := SlicePtrFromStrings(argv) if err != nil { return err } _, _, e1 := Syscall(SYS_EXEC, uintptr(unsafe.Pointer(argv0p)), uintptr(unsafe.Pointer(&argvp[0])), 0) return e1 } // WaitProcess waits until the pid of a // running process is found in the queue of // wait messages. It is used in conjunction // with ForkExec/StartProcess to wait for a // running process to exit. func WaitProcess(pid int, w *Waitmsg) (err error) { procs.Lock() ch := procs.waits[pid] procs.Unlock() var wmsg *waitErr if ch != nil { wmsg = <-ch procs.Lock() if procs.waits[pid] == ch { delete(procs.waits, pid) } procs.Unlock() } if wmsg == nil { // ch was missing or ch is closed return NewError("process not found") } if wmsg.err != nil { return wmsg.err } if w != nil { *w = wmsg.Waitmsg } return nil }
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