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| author | antoine <antoine@FreeBSD.org> | 2008-03-08 22:02:21 +0000 |
|---|---|---|
| committer | antoine <antoine@FreeBSD.org> | 2008-03-08 22:02:21 +0000 |
| commit | 514f31f40ed28fea8fdc190c743417debb0d03b3 (patch) | |
| tree | a5c6d546b6b95056f3d9779f9c1afae2cec004f6 /lib/libc/sys/fcntl.2 | |
| parent | 587a314ce88f943ab58c211714655de88ddbdd25 (diff) | |
| download | FreeBSD-src-514f31f40ed28fea8fdc190c743417debb0d03b3.zip FreeBSD-src-514f31f40ed28fea8fdc190c743417debb0d03b3.tar.gz | |
Introduce a new F_DUP2FD command to fcntl(2), for compatibility with
Solaris and AIX.
fcntl(fd, F_DUP2FD, arg) and dup2(fd, arg) are functionnaly equivalent.
Document it.
Add some regression tests (identical to the dup2(2) regression tests).
PR: 120233
Submitted by: Jukka Ukkonen
Approved by: rwaston (mentor)
MFC after: 1 month
Diffstat (limited to 'lib/libc/sys/fcntl.2')
| -rw-r--r-- | lib/libc/sys/fcntl.2 | 38 |
1 files changed, 37 insertions, 1 deletions
diff --git a/lib/libc/sys/fcntl.2 b/lib/libc/sys/fcntl.2 index a476cff..aef53e2 100644 --- a/lib/libc/sys/fcntl.2 +++ b/lib/libc/sys/fcntl.2 @@ -28,7 +28,7 @@ .\" @(#)fcntl.2 8.2 (Berkeley) 1/12/94 .\" $FreeBSD$ .\" -.Dd January 12, 1994 +.Dd March 8, 2008 .Dt FCNTL 2 .Os .Sh NAME @@ -78,6 +78,18 @@ is set to remain open across .Xr execve 2 system calls. .El +.It Dv F_DUP2FD +It is functionally equivalent to +.Bd -literal -offset indent +dup2(fd, arg) +.Ed +.Pp +The +.Dv F_DUP2FD +constant is not portable, so it should not be used if portability is needed. +Use +.Fn dup2 +instead. .It Dv F_GETFD Get the close-on-exec flag associated with the file descriptor .Fa fd @@ -389,6 +401,9 @@ as follows: .Bl -tag -width F_GETOWNX -offset indent .It Dv F_DUPFD A new file descriptor. +.It Dv F_DUP2FD +A file descriptor equal to +.Fa arg . .It Dv F_GETFD Value of flag (only the low-order bit is defined). .It Dv F_GETFL @@ -432,6 +447,14 @@ is not a valid open file descriptor. The argument .Fa cmd is +.Dv F_DUP2FD , +and +.Fa arg +is not a valid file descriptor. +.Pp +The argument +.Fa cmd +is .Dv F_SETLK or .Dv F_SETLKW , @@ -495,6 +518,8 @@ The argument .Fa cmd is .Dv F_DUPFD +or +.Dv F_DUP2FD and the maximum number of file descriptors permitted for the process are already in use, or no file descriptors greater than or equal to @@ -567,6 +592,7 @@ for the reasons as stated in .Xr tcgetpgrp 3 . .Sh SEE ALSO .Xr close 2 , +.Xr dup2 2 , .Xr execve 2 , .Xr flock 2 , .Xr getdtablesize 2 , @@ -575,8 +601,18 @@ for the reasons as stated in .Xr lockf 3 , .Xr tcgetpgrp 3 , .Xr tcsetpgrp 3 +.Sh STANDARDS +The +.Dv F_DUP2FD +constant is non portable. +It is provided for compatibility with AIX and Solaris. .Sh HISTORY The .Fn fcntl system call appeared in .Bx 4.2 . +.Pp +The +.Dv F_DUP2FD +constant first appeared in +.Fx 7.1 . |
