#include <unistd.h>

int isaexec(const char *path, char *const argv[], char *const envp[]);

The isaexec() function takes the path specified as path and breaks it into directory and file name components. It enquires from the running system the list of supported instruction set architectures; see isalist(5). The function traverses the list for an executable file in named subdirectories of the original directory. When such a file is located, execve() is invoked with argv[\|] and envp[\|]. See exec(2).

If no file is located, isaexec() returns ENOENT. Other return values are the same as for execve().

Example 1 Example of isaexec() function.

On a system whose isalist is

sparcv7 sparc

the program

int
main(int argc, char *argv[], char *envp[])
{
 return (isaexec("/bin/thing", argv, envp));
}

will look first for an executable file named /bin/sparcv7/thing, then for an executable file named /bin/sparc/thing. It will invoke execve() on the first executable file it finds named thing.

On that same system, a program called /u/bin/tofu can cause either /u/bin/sparcv7/tofu or /u/bin/sparc/tofu to be invoked using the following code:

int
main(int argc, char *argv[], char *envp[])
{
 return (isaexec(getexecname(), argv, envp));
}

See attributes(5) for descriptions of the following attributes:

exec(2), getexecname(3C), attributes(5), isalist(5)