aed@netcom.COM (Andrew Davidson) (03/13/91)
does anyone know what the fnew features of at&t's sys V version 4 of
unix? I have herd rummors that is supposed to support dynamic linking.
does anyone know how this will work. I currently work on a SUN
workstation using sunos 4.1. it supports "dynamic linking" but I would
argue that this is not true dynamic linking as it only accures when my
program loads. I would link to be able to link and load on the fly
Andy
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"bede-bede-bede Thats all Folks"
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Andy Davidson
Woodside CA.
aed@netcom.COM
-----------------------------------------------------------------ekrell@ulysses.att.com (Eduardo Krell) (03/13/91)
In article <27919@netcom.COM> aed@netcom.COM (Andrew Davidson) writes: >I currently work on a SUN >workstation using sunos 4.1. it supports "dynamic linking" but I would >argue that this is not true dynamic linking as it only accures when my >program loads. I would link to be able to link and load on the fly You can do that already. Look at the mmap() man page. The run-time loader (ld.so) runs in user space, so anything it does, you can do too (mmap whatever you want to load, relocate symbols, etc.) Sun provides in 4.1.1 a simple dynamic linker interface library with dlopen(), dlsym(), etc. These are also available in SVR4. Eduardo Krell AT&T Bell Laboratories, Murray Hill, NJ UUCP: {att,decvax,ucbvax}!ulysses!ekrell Internet: ekrell@ulysses.att.com
guy@auspex.auspex.com (Guy Harris) (03/14/91)
>does anyone know what the fnew features of at&t's sys V version 4 of >unix? I have herd rummors that is supposed to support dynamic linking. It does. >does anyone know how this will work. The same way it works in SunOS 4.1, essentially (although it doesn't seem to have the same major/minor version number mechanism that SunOS 4.x does). >I currently work on a SUN workstation using sunos 4.1. it supports >"dynamic linking" but I would argue that this is not true dynamic >linking as it only accures when my program loads. I would link to >be able to link and load on the fly Then use "dlopen()" and "dlsym()", which are in both SunOS 4.1 and System V Release 4. "dlopen()" takes a pathname of a shareable object (and a flag argument), maps the shareable object into the process's address space, and returns an opaque handle for that object. "dlsym()" takes a handle for a loaded object, and a pointer to a string containing the name of a function in that object, and returns a pointer to the function in question.