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Annotation of cci/usr/src/man/man3/fork.3f, revision 1.1.1.1

1.1       root        1: .TH FORK 3F "13 June 1983"
                      2: .UC 4
                      3: .SH NAME
                      4: fork \- create a copy of this process
                      5: .SH SYNOPSIS
                      6: .B integer function fork()
                      7: .SH DESCRIPTION
                      8: .I Fork
                      9: creates a copy of the calling process.
                     10: The only distinction between the 2 processes is that the value
                     11: returned to one of them (referred to as the 'parent' process)
                     12: will be the process id if the copy.
                     13: The copy is usually referred to as the 'child' process.
                     14: The value returned to the 'child' process will be zero.
                     15: .PP
                     16: All logical units open for writing are flushed before the fork to avoid
                     17: duplication of the contents of I/O buffers in the external file(s).
                     18: .PP
                     19: If the returned value is negative, it indicates an error and will be
                     20: the negation of the system error code.
                     21: See perror(3F).
                     22: .PP
                     23: A corresponding
                     24: .I exec
                     25: routine has not been provided because there is no satisfactory way to
                     26: retain open logical units across the exec.
                     27: However, the usual function of
                     28: .I fork/exec
                     29: can be performed using
                     30: .IR system (3F).
                     31: .if 0 \{
                     32: A pipe can be opened to another process using the f77
                     33: .B open
                     34: statement with
                     35: .sp 1
                     36: .ti +5
                     37: .B "file=\(fm\fIprocess\fB\(fm, status=\(fmpipe\(fm, access=\(fmread\(fm"
                     38: .br
                     39: or
                     40: .br
                     41: .ti +5
                     42: .B "file=\(fm\fIprocess\fB\(fm, status=\(fmpipe\(fm, access=\(fmwrite\(fm"
                     43: \}
                     44: .SH FILES
                     45: .ie \nM /usr/ucb/lib/libU77.a
                     46: .el /usr/lib/libU77.a
                     47: .SH "SEE ALSO"
                     48: fork(2), wait(3F), kill(3F), system(3F), perror(3F)

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