Return to exec.2 CVS log

Up to [Research Unix] / researchv10dc / dist / man / v3 / man2

Annotation of researchv10dc/dist/man/v3/man2/exec.2, revision 1.1.1.1

1.1       root        1: .pa 1
                      2: .he 'EXEC (II)'3/15/72'EXEC (II)'
                      3: .ti 0
                      4: NAME           exec  --  execute a file
                      5: .sp
                      6: .ti 0
                      7: SYNOPSIS       sys exec; name; args  / exec = 11.
                      8: .br
                      9: .li
                     10: ...
                     11: .ti -6
                     12: name: <...\\0>
                     13: .br
                     14: .li
                     15: ...
                     16: .ti -6
                     17: args: arg1; arg2; ...; 0
                     18: .ti -6
                     19: arg1: <...\\0>
                     20: .br
                     21: .li
                     22: ...
                     23: .sp
                     24: .ti 0
                     25: DESCRIPTION    exec____
                     26: overlays the calling process with the named file, then
                     27: transfers to the
                     28: beginning of the core image of the file.
                     29: The first argument to exec____ is a pointer to the name of the file
                     30: to be executed.
                     31: The second is the address of a list of pointers to
                     32: arguments to be passed to the file.
                     33: Conventionally, the first argument is the name of the
                     34: file.
                     35: Each pointer addresses a string terminated by a null byte.
                     36: .sp
                     37: There can be no return from the file; the calling core image
                     38: is lost.
                     39: 
                     40: The program break is set from the executed file; see the format
                     41: of a.out.
                     42: 
                     43: Once the called file starts execution, the arguments are available
                     44: as follows.
                     45: The stack pointer points to a word containing the number of arguments.  Just above
                     46: this number is a list of pointers to the argument strings.
                     47: 
                     48:   sp-> nargs
                     49:        arg1
                     50:        ...
                     51:        argn
                     52: 
                     53:  arg1: <arg1\\0>
                     54:        ...
                     55:  argn: <argn\\0>
                     56: 
                     57: The arguments are placed as high as possible in core:
                     58: just below 57000(8).
                     59: 
                     60: Files remain open across
                     61: exec____ calls.  However, the illegal instruction, emt___, quit, and interrupt trap
                     62: specifications are reset to the standard values.
                     63: (See ilgins______, cemt____, quit____, intr____.)
                     64: 
                     65: Each user has a real____ user ID and an effective_________ user ID
                     66: (The real ID identifies the person using the system;
                     67: the effective ID determines his access privileges.)
                     68: exec____ changes the effective user ID to
                     69: the owner of the executed file if the file has the "set-user-ID"
                     70: mode.  The real user ID is not affected.
                     71: .sp
                     72: .ti 0
                     73: SEE ALSO       fork(II)
                     74: .sp
                     75: .ti 0
                     76: DIAGNOSTICS    If
                     77: the file cannot be read or if it is not executable, a return
                     78: from exec____ constitutes the diagnostic.
                     79: The error bit (c-bit) is set.
                     80: .sp
                     81: .ti 0
                     82: BUGS           Very high core and
                     83: very low core are used by exec____
                     84: to construct the argument list
                     85: for the new core image.
                     86: If the original copies of the
                     87: arguments reside in these places,
                     88: problems can result.

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.