diff options
Diffstat (limited to 'man/man3/exec.3')
| -rw-r--r-- | man/man3/exec.3 | 63 |
1 files changed, 17 insertions, 46 deletions
diff --git a/man/man3/exec.3 b/man/man3/exec.3 index 48868616..285af111 100644 --- a/man/man3/exec.3 +++ b/man/man3/exec.3 @@ -1,6 +1,6 @@ .TH EXEC 3 .SH NAME -exec, execl, _clock, _privates, _nprivates \- execute a file +exec, execl \- execute a file .SH SYNOPSIS .B #include <u.h> .br @@ -12,15 +12,6 @@ int exec(char *name, char* argv[]) .PP .B int execl(char *name, ...) -.PP -.B -long *_clock; -.PP -.B -void **_privates; -.PP -.B -int _nprivates; .fi .SH DESCRIPTION .I Exec @@ -35,10 +26,8 @@ to be executed; it must not be a directory, and the permissions must allow the current user to execute it (see .IR stat (3)). -It should also be a valid binary image, as defined in the -.IR a.out (6) -for the current machine architecture, -or a shell script +It should also be a valid binary image, as defined by the local +operating system, or a shell script (see .IR rc (1)). The first line of a @@ -106,45 +95,17 @@ into the open mode; see .IR open (3)); and the working directory and environment (see -.IR env (3)) +.IR getenv (3)) remain the same. However, a newly .I exec'ed -process has no notification handler +process has no notification handlers (see .IR notify (3)). -.PP -When the new program begins, the global cell -.B _clock -is set to the address of a cell that keeps approximate time -expended by the process at user level. -The time is measured in milliseconds but is updated at -a system-dependent lower rate. -This clock is typically used by the profiler but is available -to all programs. -.PP -The global cell -.B _privates -points to an array of -.B _nprivates -elements of per-process private data. -This storage is private for each process, even if the processes share data segments. -.PP -The above conventions apply to C programs; the raw system -interface to the new image is as follows: -the word pointed to by the stack pointer is -.BR argc ; -the words beyond that are the zeroth and subsequent elements -of -.BR argv , -followed by a terminating null pointer; and -the return register (e.g. -.B R0 -on the 68020) contains the address of the clock. .SH SOURCE -.B /usr/local/plan9/src/libc/9syscall +.B /usr/local/plan9/src/lib9/exec.c .br -.B /usr/local/plan9/src/libc/port/execl.c +.B /usr/local/plan9/src/lib9/execl.c .SH SEE ALSO .IR prof (1), .IR intro (3), @@ -157,3 +118,13 @@ There can be no return from a successful or .IR execl ; the calling image is lost. +.SH BUGS +On Unix, unlike on Plan 9, +.I exec +and +.I execl +use the user's current path to locate +.IR prog . +This is a clumsy way to deal with Unix's lack of +a union directory for +.BR /bin . |