Calling HP-UX system and library routines

System calls provide low-level access to kernel-level resources, such as the write system routine. or example, see “File handling ” for an example of a program that calls the write routine. For information about system calls, refer to the HP-UX Reference.

HP-UX library routines provide many capabilities, such as getting system information and file stream processing. Library routines are discussed in the HP-UX Reference.

You can access many HP-UX system calls and library routines from HP Fortran 90 programs using the BSD 3F library, libU77.a. Another library provided with HP Fortran 90 is the Basic Linear Algebra Subroutine (BLAS) library, libblas.a. These subroutines perform low-level vector and matrix operations, tuned for maximum performance. See “Additional HP Fortran 90 libraries” for information about linking to these libraries. For detailed information about the both libraries, see the HP Fortran 90 Programmer's Reference.