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since the standard require the caller pass the name explicitly https://pubs.opengroup.org/onlinepubs/009695399/functions/posix_spawn.html: The argument argv is an array of character pointers to null-terminated strings. The last member of this array shall be a null pointer and is not counted in argc. These strings constitute the argument list available to the new process image. The value in argv[0] should point to a filename that is associated with the process image being started by the posix_spawn() or posix_spawnp() function. Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>